CAP1006-1-AIA-TR

CAP1005 / CAP1006 5 and 6 Channel Capacitive Touch Sensor PRODUCT FEATURES General Description The CAP1006 and CAP1005 are multiple channel Capacitive Touch sensors. The CAP1006 contains six (6) individual Capacitive Touch sensor inputs while the CAP1005 contains five (5) sensors. Both devices offer programmable sensitivity for use in touch sensor applications. Each sensor automatically recalibrates to compensate for gradual environmental changes. The CAP1005 / CAP1006 offers multiple power states operating at low quiescent currents. During the Standby mode of operation, one or more Capacitive Touch Sensors are active. The Deep Sleep mode of operation is the lowest power state available drawing 3uA of current. During this mode, no sensors are active. Communications will wake the device. Datasheet Applications Desktop and Notebook PC’s LCD Monitors Printers Appliances Features Six (6) Capacitive Touch Sensor Inputs - CAP1006 Five (5) Capacitive Touch Sensor Inputs - CAP1005 — Programmable sensitivity — Automatic recalibration — Individual thresholds for each button Flexible Capacitive Touch Sense algorithm Multiple Communication interfaces — SMBus / I2C compliant interface (CAP1006-1 only) — SMSC BC-Link interface (CAP1006-2 only) — SPI communications (CAP1005 only) — 3uA quiescent current in Deep Sleep — Samples one or more channels in Standby — Open Drain or Push-Pull Low Power operation Available in 10-pin 3mm x 3mm RoHS compliant DFN package CAP1006 Block Diagram CAP1005 Block Diagram VDD GND VDD GND SMCLK1 / BC_CLK Capacitive Sensing Algorithm SMBus Slave Protocol 1 2 SPI_CS# 2 SMDATA / BC_DATA ALERT#1 / BC_IRQ#2 Capacitive Sensing Algorithm SPI Protocol SPI_CLK SPI_MOSI SPI_MISO 1 CS1 CS2 CS3 CS4 CS5 CS6 2 = CAP1006-1 = CAP1006-2 CS1 CS2 CS3 CS4 CS5 Note: I2C is a trademark of NXP semiconductor. BC-Link is a trademark of SMSC. SMSC CAP1005 / CAP1006 DATASHEET Revision 1.1 (08-05-09) 5 and 6 Channel Capacitive Touch Sensor Datasheet ORDERING INFORMATION ORDERING NUMBER CAP1006-1-AIA-TR CAP1006-2-AIA-TR CAP1005-1-AIA-TR PACKAGE 10-pin DFN 3mm x 3mm (Lead Free RoHS compliant) 10-pin DFN 3mm x 3mm (Lead Free RoHS compliant) 10-pin DFN 3mm x 3mm (Lead Free RoHS compliant) FEATURES Six Capacitive Touch Sensors, SMBus interface Six Capacitive Touch Sensors, BC-Link interface Five Capacitve Touch sensors, Full Duplex SPI interface REEL SIZE IS 4,000 PIECES 80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123 Copyright © 2009 SMSC or its subsidiaries. All rights reserved. Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC’s website at http://www.smsc.com. SMSC is a registered trademark of Standard Microsystems Corporation (“SMSC”). Product names and company names are the trademarks of their respective holders. SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT; TORT; NEGLIGENCE OF SMSC OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD TO HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Revision 1.1 (08-05-09) 2 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Table of Contents Chapter 1 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Chapter 2 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Chapter 3 Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.1 Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1.1 SMBus (I2C) Communications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1.2 SPI Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1.3 BC-Link Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . System Management Bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2.1 SMBus Start Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2.2 SMBus Address and RD / WR Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2.3 SMBus Data Bytes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2.4 SMBus ACK and NACK Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2.5 SMBus Stop Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2.6 SMBus Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2.7 SMBus and I2C Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SMBus Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3.1 SMBus Write Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3.2 Block Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3.3 SMBus Read Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3.4 Block Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3.5 SMBus Send Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3.6 SMBus Receive Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SPI Interface (CAP1005 only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4.1 SPI Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4.2 SPI_CS# Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4.3 Address Pointer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4.4 SPI Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Normal SPI Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.1 Reset Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.2 Set Address Pointer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.3 Write Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.4 Read Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BC-Link Interface (CAP1006-2 only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 13 13 13 13 14 14 14 14 14 14 14 15 15 15 16 16 16 16 17 17 17 17 18 18 19 20 20 21 22 3.2 3.3 3.4 3.5 3.6 Chapter 4 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.1 4.2 Power States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Capacitive Touch Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2.1 Sensing Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2.2 Recalibrating Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ALERT# Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3.1 Sensor Interrupt Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 25 25 25 25 25 4.3 Chapter 5 Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 5.1 5.2 5.3 5.4 5.5 5.6 Main Status Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Noise Flag Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sensor Delta Count Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sensitivity Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 29 30 30 31 31 33 SMSC CAP1005 / CAP1006 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet 5.7 5.8 5.9 5.10 5.11 5.12 5.13 5.14 5.15 5.16 5.17 5.18 5.19 5.20 5.21 5.22 5.23 5.24 5.25 Sensor Enable Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sensor Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sensor Configuration 2 Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Averaging and Sampling Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Calibration Activate Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interrupt Enable Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Repeat Rate Enable Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Multiple Touch Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Recalibration Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sensor Threshold Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sensor Noise Threshold Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.17.1 Sensor Noise Threshold 1 Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.17.2 Sensor Noise Threshold 2 Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Standby Channel Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Standby Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Standby Sensitivity Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Standby Threshold Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sensor Base Count Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Manufacturer ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Revision Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 34 36 36 38 38 39 39 40 41 42 42 42 43 43 45 45 46 46 47 47 Chapter 6 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 6.1 6.2 CAP1006 and CAP1005 Package Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Package Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Chapter 7 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Revision 1.1 (08-05-09) 4 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet List of Figures Figure 1.1 Figure 1.2 Figure 3.1 Figure 3.1 Figure 3.1 Figure 3.2 Figure 3.3 Figure 3.4 Figure 3.5 Figure 3.6 Figure 4.1 Figure 4.2 Figure 4.3 Figure 4.4 Figure 6.1 Figure 6.2 Figure 6.3 Figure 6.4 Figure 6.5 Figure 6.6 CAP1006 Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 CAP1005 Pin Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 SMBus Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 SPI Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Example SPI Bus Communication - Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 SPI Reset Interface Command - Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 SPI Set Address Pointer Command - Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 SPI Write Command - Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 SPI Read Command - Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 SPI Read Command - Normal Mode - Full . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 System Diagram for CAP1006 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 System Diagram for CAP1005 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Sensor Interrupt Behavior - Repeat Rate Enabled. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Sensor Interrupt Behavior - No Repeat Rate Enabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 10-Pin DFN 3mm x 3mm Package Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 10-Pin DFN 3mm x 3mm Package Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 10-Pin DFN 3mm x 3mm PCB Footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 CAP1006-1 Package Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 CAP1006-2 Package Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 CAP1005 Package Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 SMSC CAP1005 / CAP1006 5 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet List of Tables Table 1.1 Pin Description for CAP1006 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 1.2 Pin Description for CAP1005 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 1.3 Pin Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Table 2.1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 2.2 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 3.1 Protocol Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 3.2 Write Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 3.3 Block Write Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 3.4 Read Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Table 3.5 Block Read Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Table 3.6 Send Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Table 3.7 Receive Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Table 5.1 Register Set in Hexadecimal Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Table 5.2 Main Status Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Table 5.3 Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Table 5.4 Noise Flag Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Table 5.5 Sensor Delta Count Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Table 5.6 Sensitivity Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Table 5.7 DELTA_SENSE Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Table 5.8 BASE_SHIFT Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Table 5.9 Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Table 5.10 Sensor Enable Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Table 5.11 Sensor Configuration Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Table 5.12 MAX_DUR Bit Decode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Table 5.13 RPT_RATE Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Table 5.14 Sensor Configuration 2 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Table 5.15 Averaging and Sampling Configuration Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Table 5.16 AVG Bit Decode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Table 5.17 CYCLE_TIME Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Table 5.18 Calibration Activate Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Table 5.19 Interrupt Enable Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Table 5.20 Repeat Rate Enable Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Table 5.21 Multiple Touch Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Table 5.22 B_MULT_T Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Table 5.23 Recalibration Configuration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Table 5.24 NEG_DELTA_CNT Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Table 5.25 CAL_CFG Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Table 5.26 Sensor Threshold Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Table 5.27 Sensor Noise Threshold Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Table 5.28 CSx_BN_TH Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Table 5.29 Standby Channel Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Table 5.30 Standby Configuration Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Table 5.31 STBY_AVG Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Table 5.32 STBY_CY_TIME Bit Decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Table 5.33 Standby Configuration Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Table 5.34 STBY_SENSE Bit Decode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Table 5.35 Standby Threshold Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Table 5.36 Sensor Base Count Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Table 5.37 Product ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Table 5.38 Vendor ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Table 5.39 Revision Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Table 7.1 Customer Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Revision 1.1 (08-05-09) 6 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Chapter 1 Pin Description CAP1006 3mm x 3mm DFN CS1 ALERT# / BC_IRQ# SMDATA / BC_DATA SMCLK / BC_CLK VDD 1 2 3 4 5 10 CS2 9 8 7 6 CS3 CS4 CS5 CS6 GND Figure 1.1 CAP1006 Pin Table 1.1 Pin Description for CAP1006 PIN NUMBER 1 PIN NAME CS1 PIN FUNCTION Capacitive Touch Sensor 1 ALERT# - Active low alert / interrupt output usable for SMBus alert (CAP1006-1) BC_IRQ# - Active low interrupt / optional for BC-Link (CAP1006-2) SMDATA - Bi-directional, open-drain SMBus data - requires pull-up resistor (CAP1006-1) BC_DATA - Bi-directional, open-drain BC-Link data - requires pullup resistor (CAP1006-2) SMCLK - SMBus clock input - requires pull-up resistor (CAP1006-1) BC_CLK - BC-Link clock input (CAP1006-2) PIN TYPE AIO OD (5V) OD (5V) DIOD (5V) DIO DI (5V) DI (5V) Power AIO AIO AIO AIO Revision 1.1 (08-05-09) 2 ALERT# / BC_IRQ# 3 SMDATA / BC_DATA 4 SMCLK / BC_CLK VDD CS6 CS5 CS4 CS3 5 6 7 8 9 Positive Power supply Capacitive Touch Sensor 6 Capacitive Touch Sensor 5 Capacitive Touch Sensor 4 Capacitive Touch Sensor 3 7 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Table 1.1 Pin Description for CAP1006 (continued) PIN NUMBER 10 Bottom Pad PIN NAME CS2 GND PIN FUNCTION Capacitive Touch Sensor 2 Ground PIN TYPE AIO Power CAP1005 3mm x 3mm DFN SPI_CS# SPI_MOSI SPI_MISO SPI_CLK VDD 1 2 3 4 5 10 CS1 9 8 7 6 CS2 CS3 CS4 CS5 GND Figure 1.2 CAP1005 Pin Diagram Table 1.2 Pin Description for CAP1005 PIN NUMBER 1 2 3 4 5 6 7 8 9 PIN NAME SPI_CS# SPI_MOSI SPI_MISO SPI_CLK VDD CS5 CS4 CS3 CS2 PIN FUNCTION Active low chip-select for SPI bus SPI_MOSI - SPI Master-Out-Slave-In port SPI Master-In-Slave-Out data port SPI clock input Positive Power supply Capacitive Touch Sensor 5 Capacitive Touch Sensor 4 Capacitive Touch Sensor 3 Capacitive Touch Sensor 2 PIN TYPE DI (5V) DI (5V) DO DI (5V) Power AIO AIO AIO AIO Revision 1.1 (08-05-09) 8 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Table 1.2 Pin Description for CAP1005 (continued) PIN NUMBER 10 Bottom Pad PIN NAME CS1 GND PIN FUNCTION Capacitive Touch Sensor 1 Ground PIN TYPE AIO Power The pin types are described in detail below. All pins labeled with (5V) are 5V tolerant. APPLICATION NOTE: For the 5V tolerant pins that have a pull-up resistor, the pull-up voltage must not exceed 3.6V when the CAP1005 / CAP1006 is unpowered. Table 1.3 Pin Types PIN TYPE Power DI AIO DIOD DESCRIPTION This pin is used to supply power or ground to the device. Digital Input - This pin is used as a digital input. This pin is 5V tolerant. Analog Input / Output -This pin is used as an I/O for analog signals. Digital Input / Open Drain Output- This pin is used as a digital I/O. When it is used as an output, it is open drain and requires a pull-up resistor. This pin is 5V tolerant. Open Drain Digital Output - this pin is used as a digital output. It is open drain and requires a pull-up resistor. This pin is 5V tolerant. Push-pull Digital Output - This pin is used as a digital output and can sink and source current. Push-pull Digital Input / Output - This pin is used as an I/O for digital signals. OD DO DIO SMSC CAP1005 / CAP1006 9 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Chapter 2 Electrical Specifications Table 2.1 Absolute Maximum Ratings Voltage on 5V tolerant pins (V5VT_PIN) Voltage on 5V tolerant pins (|V5VT_PIN - VDD|) Note 2.2 Voltage on VDD pin Voltage on any other pin to GND Package Power Dissipation up to TA = 85°C for 10 pin DFN (see Note 2.3) Junction to Ambient (θJA) Operating Ambient Temperature Range Storage Temperature Range ESD Rating, All Pins, HBM Note 2.1 -0.3 to 5.5 0 to 3.6 -0.3 to 4 -0.3 to VDD + 0.3 0.7 77.7 -40 to 125 -55 to 150 8000 V V V V W °C/W °C °C V Stresses above those listed could cause permanent damage to the device. This is a stress rating only and functional operation of the device at any other condition above those indicated in the operation sections of this specification is not implied. For the 5V tolerant pins that have a pull-up resistor, the voltage difference between V5VT_PIN and VDD must never exceed 3.6V. The Package Power Dissipation specification assumes a recommended thermal via design consisting of a 2x2 matrix of 0.3mm (12mil) vias at 1.0mm pitch connected to the ground plane with a 1.6 x 2.3mm thermal landing. Note 2.2 Note 2.3 Table 2.2 Electrical Specifications VDD = 3V to 3.6V, TA = 0°C to 100°C, all Typical values at TA = 27°C unless otherwise noted. CHARACTERISTIC SYMBOL MIN TYP MAX UNIT CONDITIONS DC Power Supply Voltage Supply Current VDD ISTBY 3.0 3.3 160 3.6 210 V uA Standby state active 1 sensor monitored Default conditions (8 avg, 70ms cycle time) Deep Sleep state active No communications TA < 85°C Average current Capacitive Sensing Active IDSLEEP 3 10 uA IDD 300 500 uA Capacitive Touch Sensor Revision 1.1 (08-05-09) 10 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Table 2.2 Electrical Specifications (continued) VDD = 3V to 3.6V, TA = 0°C to 100°C, all Typical values at TA = 27°C unless otherwise noted. CHARACTERISTIC Maximum Base Capacitance Detectable Capacitive Shift SYMBOL CBASE MIN TYP 50 0.1 2 MAX UNIT pF pF CONDITIONS Pad untouched Pad touched ΔCTOUCH I/O Pins - SPI_CS#, SPI_MOSI, and ALERT# pins Output Low Voltage Input High Voltage Input Low Voltage Leakage Current VOL VIH VIL ILEAK 2.0 0.8 ±5 0.4 V V V uA powered or unpowered TA < 85°C ISINK_IO = 4mA SMDATA / BC_DATA / SPI_MSIO / SPI_MISO and SMCLK / BC_CLK / SPI_CLK pins Output Low Voltage Output High Voltage Input High Voltage Input Low Voltage Leakage Current VOL VOH VIH VIL ILEAK VDD 0.4 2.0 0.8 ±5 0.4 V V V V uA powered or unpowered TA < 85°C pull-up voltage < 3.6V ISINK_IO = 8mA ISOURCE_IO = 8mA SMBus First Communication tSMB 15 ms SMBus Timing (CAP1006-1 only) Input Capacitance Clock Frequency Spike Suppression Bus free time Start to Stop Setup Time: Start Setup Time: Stop Data Hold Time Data Setup Time Clock Low Period Clock High Period Clock/Data Fall time Clock/Data Rise time CIN fSMB tSP tBUF tSU:STA tSU:STP tHD:DAT tSU:DAT tLOW tHIGH tFALL tRISE 1.3 0.6 0.6 0.6 0.6 1.3 0.6 300 300 6 72 10 5 400 50 pF kHz ns us us us us us us us ns ns Min = 20+0.1CLOAD ns Min = 20+0.1CLOAD ns SMSC CAP1005 / CAP1006 11 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Table 2.2 Electrical Specifications (continued) VDD = 3V to 3.6V, TA = 0°C to 100°C, all Typical values at TA = 27°C unless otherwise noted. CHARACTERISTIC Capacitive Load SYMBOL CLOAD MIN TYP MAX 400 UNIT pF CONDITIONS per bus line BC-Link Timing (CAP1006-2 only) Clock Period Data Hold Time Data Setup Time Clock Duty Cycle tCLK tHD:DAT tSU:DAT Duty 250 0 30 40 50 60 ns ns ns % Data must be valid before clock SPI Timing (CAP1005 only) Clock Period Clock Low Period Clock High Period Clock Rise / Fall time Data Output Delay Data Setup Time Data Hold Time SPI_CS# to SPI_CLK setup time Wake Time tP tLOW tHIGH tRISE / tFALL tD:CLK tSU:DAT tHD:DAT tSU:CS tWAKE 20 20 0 10 20 250 0.4 x tP 0.4 x tP 0.6 x tP 0.6 x tP 0.1 x tP 10 ns ns ns ns ns ns ns ns us SPI_CS# asserted to CLK assert Revision 1.1 (08-05-09) 12 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Chapter 3 Communications 3.1 Communications The CAP1006-1 communicates using the SMBus or I2C protocol. The CAP1006-2 communicates using the 2-wire proprietary BC-Link protocol. The CAP1005 communicates using 4-wire SPI bus. Regardless of the communications mechanism, the device functionality remains unchanged. 3.1.1 SMBus (I2C) Communications When configured to communicate via the SMBus, the CAP1006 supports the following protocols: Send Byte, Receive Byte, Read Byte, and Write Byte. In addition, the device supports I2C formatting for block read and block write protocols. See Section 3.2 and Section 3.3 for more information on the SMBus bus and protocols respectively. 3.1.2 SPI Communications The CAP1005 is configured to communicate via SPI bus, using a 4-wire protocol. It does not support the 3-wire protocol. See Section 3.4 and Section 3.5 for more information on the SPI bus and protocols respectively. 3.1.3 BC-Link Communications When BC-Link communications are used, the CAP1006 supports the read byte protocol and the write byte protocol. See Section 3.6 for more information on the BC-Link Bus and protocols respectively. APPLICATION NOTE: Upon power up, the CAP1006 will not respond to any communications for up to 15ms. After this time, full functionality is available. 3.2 System Management Bus The CAP1006 communicates with a host controller, such as an SMSC SIO, through the SMBus. The SMBus is a two-wire serial communication protocol between a computer host and its peripheral devices. A detailed timing diagram is shown in Figure 3.1. Stretching of the SMCLK signal is supported; however, the CAP1006 will not stretch the clock signal. TLOW THIGH THD:STA TSU:STO SMCLK THD:STA TRISE TFALL THD:DAT TSU:DAT TSU:STA SMDATA TBUF P S S - Start Condition S P - Stop Condition P Figure 3.1 SMBus Timing Diagram SMSC CAP1005 / CAP1006 13 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet 3.2.1 SMBus Start Bit The SMBus Start bit is defined as a transition of the SMBus Data line from a logic ‘1’ state to a logic ‘0’ state while the SMBus Clock line is in a logic ‘1’ state. 3.2.2 SMBus Address and RD / WR Bit The SMBus Address Byte consists of the 7-bit client address followed by the RD / WR indicator bit. If this RD / WR bit is a logic ‘0’, then the SMBus Host is writing data to the client device. If this RD / WR bit is a logic ‘1’, then the SMBus Host is reading data from the client device. The CAP1006-1 responds to SMBus address 0101_000(r/w). 3.2.3 SMBus Data Bytes All SMBus Data bytes are sent most significant bit first and composed of 8-bits of information. 3.2.4 SMBus ACK and NACK Bits The SMBus client will acknowledge all data bytes that it receives. This is done by the client device pulling the SMBus Data line low after the 8th bit of each byte that is transmitted. This applies to both the Write Byte and Block Write protocols. The Host will NACK (not acknowledge) the last data byte to be received from the client by holding the SMBus data line high after the 8th data bit has been sent. For the Block Read protocol, the Host will ACK each data byte that it receives except the last data byte. 3.2.5 SMBus Stop Bit The SMBus Stop bit is defined as a transition of the SMBus Data line from a logic ‘0’ state to a logic ‘1’ state while the SMBus clock line is in a logic ‘1’ state. When the CAP1006 detects an SMBus Stop bit, and it has been communicating with the SMBus protocol, it will reset its client interface and prepare to receive further communications. 3.2.6 SMBus Timeout The CAP1006 includes an SMBus timeout feature. Following a 30ms period of inactivity on the SMBus where the SMCLK pin is held low, the device will timeout and reset the SMBus interface. The timeout function defaults to disabled. It can be enabled by setting the TIMEOUT bit in the Configuration register (see Section 5.6). 3.2.7 SMBus and I2C Compliance The major difference between SMBus and I2C devices is highlighted here. For complete compliance information refer to the SMBus 2.0 specification. 1. Minimum frequency for SMBus communications is 10kHz. 2. The client protocol will reset if the clock is held low longer than 30ms. 3. The client protocol will reset if both the clock and the data line are high for longer than 150us (idle condition). 4. I2C devices do not support the Alert Response Address functionality (which is optional for SMBus). 5. I2C devices support block read and write differently. I2C protocol allows for unlimited number of bytes to be sent in either direction. The SMBus protocol requires that an additional data byte indicating number of bytes to read / write is transmitted. The CAP1006 supports I2C formatting only. Revision 1.1 (08-05-09) 14 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet 3.3 SMBus Protocols The CAP1006 is SMBus 2.0 compatible and supports Send Byte, Read Byte, Block Read, Receive Byte as valid protocols as shown below. The CAP1006 also supports the I2C block read and block write protocols. Finally, it will respond to the Alert Response Address protocol but is not in full compliance. All of the below protocols use the convention in Table 3.1. Table 3.1 Protocol Format DATA SENT TO DEVICE Data sent DATA SENT TO THE HOST Data sent 3.3.1 SMBus Write Byte The Write Byte is used to write one byte of data to a specific register as shown in Table 3.2. Table 3.2 Write Byte Protocol SLAVE ADDRESS 0101_000 REGISTER ADDRESS XXh REGISTER DATA XXh START 1 ->0 WR 0 ACK 0 ACK 0 ACK 0 STOP 0 -> 1 3.3.2 Block Write The Block Write is used to write multiple data bytes to a group of contiguous registers as shown in Table 3.3. It is an extension of the Write Byte Protocol. APPLICATION NOTE: When using the Block Write protocol, the internal address pointer will be automatically incremented after every data byte is received. It will wrap from FFh to 00h. Table 3.3 Block Write Protocol SLAVE ADDRESS 0101_000 REGISTER ADDRESS XXh REGISTER DATA XXh START 1 ->0 REGISTER DATA XXh WR 0 REGISTER DATA XXh ACK 0 ACK 0 REGISTER DATA XXh ACK 0 ACK 0 ACK 0 ... ... ACK 0 STOP 0 -> 1 SMSC CAP1005 / CAP1006 15 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet 3.3.3 SMBus Read Byte The Read Byte protocol is used to read one byte of data from the registers as shown in Table 3.4. Table 3.4 Read Byte Protocol START SLAVE ADDRESS WR ACK REGISTER ADDRESS ACK START CLIENT ADDRESS RD ACK REGISTER DATA NACK STOP 1->0 0101_000 0 0 XXh 0 1 ->0 0101_000 1 0 XXh 1 0 -> 1 3.3.4 Block Read The Block Read is used to read multiple data bytes from a group of contiguous registers as shown in Table 3.5. It is an extension of the Read Byte Protocol. APPLICATION NOTE: When using the Block Read protocol, the internal address pointer will be automatically incremented after every data byte is received. It will wrap from FFh to 00h. Table 3.5 Block Read Protocol START SLAVE ADDRESS WR ACK REGISTER ADDRESS ACK START SLAVE ADDRESS RD ACK REGISTER DATA 1->0 ACK 0101_000 REGISTER DATA 0 ACK 0 REGISTER DATA XXh ACK 0 REGISTER DATA 1 ->0 ACK 0101_000 ... 1 REGISTER DATA 0 NACK XXh STOP 0 XXh 0 XXh 0 XXh 0 ... XXh 1 0 -> 1 3.3.5 SMBus Send Byte The Send Byte protocol is used to set the internal address register pointer to the correct address location. No data is transferred during the Send Byte protocol as shown in Table 3.6. Table 3.6 Send Byte Protocol SLAVE ADDRESS 0101_000 REGISTER ADDRESS XXh START 1 -> 0 WR 0 ACK 0 ACK 0 STOP 0 -> 1 3.3.6 SMBus Receive Byte The Receive Byte protocol is used to read data from a register when the internal register address pointer is known to be at the right location (e.g. set via Send Byte). This is used for consecutive reads of the same register as shown in Table 3.7. Table 3.7 Receive Byte Protocol SLAVE ADDRESS 0101_000 START 1 -> 0 RD 1 ACK 0 REGISTER DATA XXh NACK 1 STOP 0 -> 1 Revision 1.1 (08-05-09) 16 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet 3.4 SPI Interface (CAP1005 only) The SMBus has a predefined packet structure, the SPI does not. The SPI Bus can operate in two modes of operation, normal 4-wire mode and bi-directional 3-wire mode. The CAP1005 only supports normal 4-wire mode. All SPI commands consist of 8-bit packets set to a specific slave device (identified by the CS pin). The SPI bus will latch data on the rising edge of the clock and the clock and data both idle high. All commands are supported via both operating modes. The supported commands are: Reset Serial interface, set address pointer, write command and read command. Note that all other codes received during the command phase are ignored and have no effect on the operation of the device. tP tLOW tHIGH SPI_CLK tRISE tFALL SPI_MSIO or SPI_MOSI or SPI_MISO tSU:DAT tD:CLK tHD:DAT Figure 3.1 SPI Timing 3.4.1 SPI Normal Mode In the normal mode of operation, there are dedicated input and output data lines. The host communicates by sending a command along the CAP1005 SPI_MOSI data line and reading data on the SPI_MISO data line. Both communications occur simultaneously which allows for larger through put of data transactions. All basic transfers consist of two 8 bit transactions from the Master device while the slave device is simultaneously sending data at the current address pointer value. Data writes consist of two or more 8-bit transactions. The host sends a specific write command followed by the data to write the address pointer. Data reads consist of one or more 8-bit transactions. The host sends the specific read data command and continues clocking for as many data bytes as it wishes to receive. 3.4.2 SPI_CS# Pin The SPI Bus is a single master, multiple slave serial bus. Each slave has a dedicated CS pin (chip select) that the master asserts low to identify that the slave is being addressed. There are no formal addressing options. 3.4.3 Address Pointer All data writes and reads are accessed from the current address pointer. In both Bi-directional mode and Full Duplex mode, the Address pointer is automatically incremented following every read command or every write command. SMSC CAP1005 / CAP1006 17 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet The address pointer will return to 00h after reaching FFh. 3.4.4 SPI Timeout The CAP1005 does not detect any timeout conditions on the SPI bus. 3.5 Normal SPI Protocols When operating in normal mode, the SPI bus internal address pointer is incremented depending upon which command has been transmitted. Multiple commands may be transmitted sequentually so long as the SPI_CS# pin is asserted low. Figure 3.1 shows an example of this operation. Revision 1.1 (08-05-09) 18 SMSC CAP1005 / CAP1006 DATASHEET Revision 1.1 (08-05-09) 19 DATASHEET SMSC CAP1005 / CAP1006 Datasheet 5 and 6 Channel Capacitive Touch Sensor SPI_CS# SPI_MOSI 7Ah 7Ah 7Dh 41h 7Eh 66h 7Dh 41h 7Fh 7Fh 7Fh 7Fh 7Fh 7Fh 7Dh 40h 7Fh 7Fh SPI_MISO XXh (invalid) XXh (invalid) YYh (invalid) YYh (invalid) XXh (invalid) 45h AAh (invalid) AAh (invalid) 55h (invalid) 66h AAh AAh 55h 80h 43h 78h XXh (invalid) 56h SPI Address Pointer SPI Data output buffer 00h XXh 41h 45h 42h AAh 41h 55h 41h 66h 42h AAh 43h 55h 44h 80h 45h 43h 46h 78h 40h 80h 40h 56h Register Address / Data 40h / 56h 41h / 45h 42h / AAh 43h / 55h 44h / 80h 45h / 43h 46h / 78h 40h / 56h 41h / 45h 42h / AAh 43h / 55h 44h / 80h 45h / 43h 46h / 78h Indicates SPI Address pointer incremented 40h / 56h 41h / 66h 42h / AAh 43h / 55h 44h / 80h 45h / 43h 46h / 78h 40h / 56h 41h / 66h 42h / AAh 43h / 55h 44h / 80h 45h / 43h 46h / 78h 40h / 56h 41h / 66h 42h / AAh 43h / 55h 44h / 80h 45h / 43h 46h / 78h 40h / 56h 41h / 66h 42h / AAh 43h / 55h 44h / 80h 45h / 43h 46h / 78h 40h / 56h 41h / 66h 42h / AAh 43h / 55h 44h / 80h 45h / 43h 46h /78h 40h / 56h 41h / 66h 42h / AAh 43h / 55h 44h / 80h 45h / 43h 46h /78h 40h / 56h 41h / 66h 42h / AAh 43h / 55h 44h / 80h 45h / 43h 46h / 78h 40h / 56h 41h / 66h 42h / AAh 43h / 55h 44h / 80h 45h / 43h 46h /78h Figure 3.1 Example SPI Bus Communication - Normal Mode 3.5.1 Reset Interface Resets the Serial interface whenever two successive 7Ah codes are received. Regardless of the current phase of the transaction - command or data, the receipt of the successive reset commands resets the Serial communication interface only. All other functions are not affected by the reset operation. 5 and 6 Channel Capacitive Touch Sensor Datasheet SPI_CS# SPI_CLK Master SPDOUT SPI_MOSI ‘0’ ‘1’ ‘1’ ‘1’ ‘1’ ‘0’ ‘1’ ‘0’ ‘0’ ‘1’ ‘1’ ‘1’ ‘1’ ‘0’ ‘1’ ‘0’ Reset - 7Ah Reset - 7Ah SPI_MISO Invalid register data 00h – Internal Data buffer empty Master Drives Slave Drives Figure 3.2 SPI Reset Interface Command - Normal Mode 3.5.2 Set Address Pointer The Set Address Pointer command sets the Address pointer for subsequent reads and writes of data. The pointer is set on the rising edge of the final data bit. At the same time, the data that is to be read is fetched and loaded into the internal output buffer but is not transmitted. SPI_CS# SPI_CLK Master SPDOUT SPI_MOSI ‘0’ ‘1’ ‘1’ ‘1’ ‘1’ ‘1’ ‘0’ ‘1’ Register Address Set Address Pointer – 7Dh SPI_MISO Unknown, Invalid Data Unknown, Invalid Data Master Drives Slave Drives Address pointer set Figure 3.3 SPI Set Address Pointer Command - Normal Mode 3.5.3 Write Data The Write Data protocol updates the contents of the register referenced by the address pointer. As the command is processed, the data to be read is fetched and loaded into the internal output buffer but not transmitted. Then, the register is updated with the data to be written. Finally, the address pointer is incremented. Revision 1.1 (08-05-09) 20 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet SPI_CS# SPI_CLK Master SPDOUT SPI_MOSI Write Command – 7Eh Data to Write SPI_MISO Unknown, Invalid Data Old Data at Current Address Pointer Master Drives Slave Drives 1. Data written at current address pointer 2. Address pointer incremented Figure 3.4 SPI Write Command - Normal Mode 3.5.4 Read Data The Read Data protocol is used to read data from the device. During the normal mode of operation, while the device is receiving data, the CAP1005 is simultaneously transmitting data to the host. For the Set Address commands and the Write Data commands, this data may be invalid and it is recommended that the Read Data command is used. SPI_CS# SPI_CLK Master SPDOUT SPI_MOSI ‘0’ ‘1’ ‘1’ ‘1’ ‘1’ ‘1’ ‘1’ ‘1’ ‘0’ ‘1’ ‘1’ ‘1’ ‘1’ ‘1’ ‘1’ ‘1’ First Read Command – 7Fh SPI_MISO Invalid, Unknown Data * Subsequent Read Commands – 7F Data at Current Address Pointer Master Drives Slave Drives Address Pointer Incremented ** * The first read command after any other command will return invalid data for the first byte. Subsequent read commands will return the data at the Current Address Pointer ** The Address Pointer is incremented 8 clocks after the Read Command has been received. Therefore continually sending Read Commands will result in each command reporting new data. Once Read Commands have been finished, the last data byte will be read during the next 8 clocks for any command Figure 3.5 SPI Read Command - Normal Mode SMSC CAP1005 / CAP1006 21 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet 1. Register Read Address updated to Current SPI Read Address pointer 1. Register Read Address incremented = current address pointer + 1 1. Register Read Address updated to Current SPI Read Address pointer. 2. Register Read Address incremented = current address pointer +1 – end result = register address pointer doesn’t change SPI_CS# SPI_MISO ‘0’ ‘1’ ‘1’ ‘1’ ‘1’ ‘1’ ‘1’ ‘1’ XXh ‘0’ ‘1’ ‘1’ ‘1’ ‘1’ ‘1’ ‘1’ ‘1’ Read Command – 7Fh Master SPDOUT SPI_MOSI Data at previously set register address = current SPI_CLK address pointer Data at previously set register address = current address pointer (SPI) Subsequent Read Commands – 7Fh Data at previously set register address = current address pointer (SPI) Master Drives 1. Output buffer transmitted = data at previous address 1. Register data loaded into pointer + 1 = current address output buffer = data at current pointer address pointer Slave Drives Register Data loaded into 1. Register data loaded into Output buffer = data at current output buffer = data at current address pointer + 1 address pointer 1. SPI Read Address Incremented = new current 1. Output buffer transmitted = address pointer data at current address pointer 2. Register Read Address +1 Incremented = current address 1. Output buffer transmitted = 2. Flag set to increment SPI data at previous register pointer +1 Read Address at end of next 8 address pointer + 1 = current clocks address pointer 1. Output buffer transmitted = data at current address pointer +1 2. Flag set to increment SPI Read Address at end of next 8 clocks Figure 3.6 SPI Read Command - Normal Mode - Full 3.6 BC-Link Interface (CAP1006-2 only) The BC-Link is a proprietary bus developed to allow communication between a host controller device to a companion device. This device uses this serial bus to read and write registers and for interrupt processing. The interface uses a data port concept, where the base interface has an address register, data register and a control register, defined in the SMSC’s 8051’s SFR space. Refer to documentation for the BC-Link comptabile host controller for details on how to access the CAP1006 via the BC-Link Interface. Revision 1.1 (08-05-09) 22 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Chapter 4 General Description The CAP1006 / 1005 are multiple channel Capacitive Touch sensors. The CAP1006 contains six (6) individual Capacitive Touch sensor inputs while the CAP1005 contains five (5) sensors. Both devices offer programmable sensitivity for use in touch sensor applications. Each sensor automatically recalibrates to compensate for gradual environmental changes. The CAP1005 / CAP1006 offers multiple power states operating at low quiescent currents during its Deep Sleep state. It can monitor one or more channels while in a lower power state and respond to communications normally. The device communicates with a host controller using the SPI bus (CAP1005 only), SMSC BC-Link bus (CAP1006-2 only), or via SMBus / I2C (CAP1006-1 only). The host controller may poll the device for updated information at any time or it may configure the device to flag an interrupt whenever a touch is detected on any sensor. A typical system diagram for the CAP1006 is shown in Figure 4.1 and a system diagram for the CAP1005 is shown in Figure 4.2. VDD Embedded Controller SMCLK1 / BC_CLK2 Touch Button Touch Button Touch Button CAP1006 CS1 CS2 SMDATA1 / BC_DATA2 ALERT# Touch Button Touch Button Touch Button CS3 CS4 CS5 CS6 1 2 = CAP1006-1 = CAP1006-2 Figure 4.1 System Diagram for CAP1006 SMSC CAP1005 / CAP1006 23 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet VDD Embedded Controller SPI_CLK SPI_CS# SPI_MISO Touch Button Touch Button Touch Button CAP1005 CS1 CS2 SPI_MOSI Touch Button Touch Button CS3 CS4 CS5 Figure 4.2 System Diagram for CAP1005 4.1 Power States The CAP1005 / CAP1006 has three operating states depending on the status of the STBY and DSLEEP bits. When the device transitions between power states, previously detected touches (for inactive channels) are cleared and the status bits reset. 1. Fully Active - The device is fully active. It is monitoring all active Capacitive Sensor channels. 2. Standby - The device is in a lower power state. It will measure a programmable number of channels (as determined by the Standby Channel register - default none). Interrupts will still be generated based on the active channels. The device will still respond to communications normally and can be returned to the Fully Active state of operation by clearing the STBY bit. 3. Deep Sleep - The device is in its lowest power state. It is not monitoring any Capacitive Sensor channels. It can be awakened by SMBus or SPI communications targeting the device (which will cause the DSLEEP bit to be automatically cleared). APPLICATION NOTE: The CAP1006-2, which communicates using the BC-Link protocol, does not support Deep Sleep. Revision 1.1 (08-05-09) 24 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet 4.2 Capacitive Touch Sensing The CAP1005 / CAP1006 contains six (6) (CAP1006) or five (5) (CAP1005) independent Capacitive Touch Sensor inputs. Each sensor has dynamic range to detect a change of capacitance due to a touch. Additionally, each sensor can be configured to be automatically and routinely re-calibrated. 4.2.1 Sensing Cycle Each Capacitive Touch Sensor has controls to be activated and included in the sensing cycle. When the device is active, it automatically initiates a sensing cycle and repeats the cycle every time it finishes. The cycle polls through each active Sensor starting with CS1 and extending through CS6. As each Capacitive Touch Sensor is polled, its measurement is compared against a baseline “not touched” measurement. If the delta measurement is large enough, then a touch is detected and an interrupt generated. The sensing cycle time is programmable (see Section 5.10). 4.2.2 Recalibrating Sensors Each sensor is regularly recalibrated at an adjustable rate. By default, the recalibration routine stores the average 256 previous measurements and periodically updates the base “Not Touched” setting for the Capacitive Touch Sensor input. It is possible that the device loses sensitivity to a touch. This may happen as a result of a noisy environment, an accidental recalibration during a touch, or other environmental changes. When this occurs, then the base untouched sensor may generate negative delta count values. The device will detect this condition based on a programmable number of consecutive negative delta readings. When it detects the condition, the CAP1005 / CAP1006 will automatically re-calibrate the base-count settings. During this recalibration, the device will not respond to touches. 4.3 ALERT# Pin The ALERT# pin is an active low output that is driven when an interrupt event is detected. Whenever an interrupt is generated, the INT bit (see Section 5.1) is set. The ALERT# pin is cleared when INT bit is cleared by the user. Additionally, when the INT bit is cleared by the user, status bits are only cleared if no touch is detected. 4.3.1 Sensor Interrupt Behavior The sensor interrupts are generated in one of two ways: 1. An interrupt is generated when a touch is detected and when a release is detected (see Figure 4.4). 2. If the repeat rate is enabled (see Section 5.6), then, so long as the touch is held, another interrupt will be generated based on the programmed repeat rate (see Figure 4.3). When the repeat rate is enabled, the device uses an additional control called MPRESS that determines whether a touch is flagged as a simple “touch” or a “press and hold”. The MPRESS[3:0] bits set a minimum press timer. When the button is touched the timer begins. If the sensor is released before the minimum press timer expires, then it is flagged as a touch and an interrupt is generated upon the release. If the sensor detects a touch for longer than this timer value, then it is flagged as a “press and hold” event. So long as the touch is held, interrupts will be generated at the programmed repeat rate and upon a release. SMSC CAP1005 / CAP1006 25 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Interrupt on Touch Touch Detected Polling Cycle (35ms) Interrupt on Release Button Repeat Rate (175ms) Button Repeat Rate (175ms) Button Repeat Rate (175ms) ALERT Pin / INT bit Button Status SMBus Write to INT bit Figure 4.3 Sensor Interrupt Behavior - Repeat Rate Enabled APPLICATION NOTE: The host may need to poll the device twice to determine that a release has been detected. Interrupt on Touch Polling Cycle (35ms) Interrupt on Release Touch Detected ALERT Pin / INT bit Button Status SMBus Write to INT bit Figure 4.4 Sensor Interrupt Behavior - No Repeat Rate Enabled Revision 1.1 (08-05-09) 26 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Chapter 5 Register Description The registers shown in Table 5.1 are accessible through the communications protocol. An entry of ‘-’ indicates that the bit is not used and will always read ‘0’. Table 5.1 Register Set in Hexadecimal Order REGISTER ADDRESS 00h 03h 0Ah 10h 11h 12h 13h 14h 15h 1Fh 20h 21h DEFAULT VALUE 00h 00h 00h 00h 00h 00h 00h 00h 00h 2Fh 20h 3Fh R/W R/W R R R R R R R R R/W R/W R/W REGISTER NAME Main Status Control Sensor Status Noise Flag Status Sensor 1 Delta Count Sensor 2 Delta Count Sensor 3 Delta Count Sensor 4 Delta Count Sensor 5 Delta Count Sensor 6 Delta Count Sensitivity Control Configuration Sensor Enable FUNCTION Controls general power states and power dissipation Returns the state of the sampeld Capacative Touch Sensor Stores the noise flags for sensors Stores the delta count for CS1 Stores the delta count for CS2 Stores the delta count for CS3 Stores the delta count for CS4 Stores the delta count for CS5 Stores the delta count for CS6 Controls the sensitivity of the threshold and delta counts and data scaling of the base counts Controls general functionality Controls whether the Capacitive Touch Sensor inputs are sampled Controls reset delay and auto-repeat delay for sensors operating in the full power state Controls the MPRESS controls for all sensors Controls averaging and sampling window Activates manual re-calibration for Capacative Touch Sensors Enables Interrupts associated with Capacative Touch Sensors Enables repeat rate for Capacative Touch Sensors Determines the number of simultaneous touches to flag a multiple touch condition Determines re-calibration timing and sampling window 27 PAGE Page 29 Page 30 Page 30 Page 31 Page 31 Page 31 Page 31 Page 31 Page 31 Page 31 Page 33 Page 33 22h R/W Sensor Configuration Sensor Configuration 2 Averaging and Sampling Config Calibration Activate Interrupt Enable Repeat Rate Enable Multiple Press Configuration Recalibration Configuration A4h Page 34 23h 24h 26h 27h 28h R/W R/W R/W R/W R/W 07h 1Dh FFh 3Fh 3Fh Page 36 Page 36 Page 38 Page 38 Page 39 2Ah R/W 80h Page 39 2Fh R/W 8Bh Page 40 SMSC CAP1005 / CAP1006 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Table 5.1 Register Set in Hexadecimal Order (continued) REGISTER ADDRESS DEFAULT VALUE R/W REGISTER NAME FUNCTION Stores the delta count threshold to determine a touch for Capacitive Touch Sensor 1 Stores the delta count threshold to determine a touch for Capacitive Touch Sensor 2 Stores the delta count threshold to determine a touch for Capacitive Touch Sensor 3 Stores the delta count threshold to determine a touch for Capacitive Touch Sensor 4 Stores the delta count threshold to determine a touch for Capacitive Touch Sensor 5 Stores the delta count threshold to determine a touch for Capacitive Touch Sensor 6 Stores controls for selecting the noise threshold for sensors 1 - 4 Stores controls for selecting the noise threshold for sensors 5 - 6 PAGE 30h R/W Sensor 1 Threshold 40h Page 41 31h R/W Sensor 2 Threshold 40h Page 41 32h R/W Sensor 3 Threshold 40h Page 41 33h R/W Sensor 4 Threshold 40h Page 41 34h R/W Sensor 5 Threshold 40h Page 41 35h R/W Sensor 6 Threshold Sensor Noise Threshold 1 Sensor Noise Threshold 2 40h Page 41 38h 39h R/W R/W 55h 55h Page 42 Page 42 Standby Configuration Registers 40h 41h 42h 43h 50h 51h 52h 53h 54h 55h R/W R/W R/W R/W R R R R R R Standby Channel Standby Configuration Standby Sensitivity Standby Threshold Sensor 1 Base Count Sensor 2 Base Count Sensor 3 Base Count Sensor 4 Base Count Sensor 5 Base Count Sensor 6 Base Count Controls which sensors are enabled while in standby Controls averaging and cycle time while in standby Controls sensitivity settings used while in standby Stores the touch detection threshold for active sensors in standby Stores the reference count value for sensor 1 Stores the reference count value for sensor 2 Stores the reference count value for sensor 3 Stores the reference count value for sensor 4 Stores the reference count value for sensor 5 Stores the reference count value for sensor 6 00h 1Dh 02h 40h C8h C8h C8h C8h C8h C8h Page 43 Page 43 Page 45 Page 45 Page 46 Page 46 Page 46 Page 46 Page 46 Page 46 Revision 1.1 (08-05-09) 28 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Table 5.1 Register Set in Hexadecimal Order (continued) REGISTER ADDRESS DEFAULT VALUE 44h Page 46 Product ID CAP1005 FEh FFh R R Manufacturer ID Revision Stores a fixed value that identifies each product Stores a fixed value that identifies SMSC Stores a fixed value that represents the revision number 45h 5Dh 81h Page 47 Page 47 R/W REGISTER NAME Product ID CAP1006 FUNCTION Stores a fixed value that identifies each product PAGE FDh R During Power-On-Reset (POR), the default values are stored in the registers. A POR is initiated when power is first applied to the part and the voltage on the VDD supply surpasses the POR level as specified in the electrical characteristics. Any reads to undefined registers will return 00h. Writes to undefined registers will not have an effect. 5.1 Main Status Control Register Table 5.2 Main Status Control Register ADDR 00h R/W R/W REGISTER Main Status Control B7 - B6 - B5 STBY B4 DSLEEP B3 - B2 - B1 - B0 INT DEFAULT 00h The Main Status and Control register controls the primary power state of the device. Bit 5 - STBY - Enables Standby. ‘0’ (default) - Sensor scanning is active. ‘1’ - Capacitive Touch Sensor scanning is limited to the sensors set in the Standby Channel register (see Section 5.18). The status registers will not be cleared until read. Sensors that are no longer sampled will flag a release and then remain in a non-touched state. Bit 4 - DSLEEP - Enables Deep Sleep by deactivating all functions. This bit will be cleared when SPI or SMBus are received targeting the CAP1005 / CAP1006. If the CAP1005 / CAP1006 is configured to communicate using the BC-Link protocol, then this bit is ignored. ‘0’ (default) - Sensor scanning is active. ‘1’ - All sensor scanning is disabled. The status registers are automatically cleared and the INT bit is cleared. Bit 0 - INT - Indicates that there is an interrupt. This bit is only set if the ALERT# pin has been asserted. If a channel detects a touch and its associated interrupt enable bit is not set to a logic ‘1’ then no action is taken. This bit is cleared by writing a logic ‘0’ to it. When this bit is cleared, the ALERT# pin will be deasserted and all status registers will be cleared if the condition has been removed. If the WAKE/SPI_MOSI pin is asserted as a result of a touch detected while in Standby, it will likewise be deasserted when this bit is cleared. Note that this pin is not driven when communicating via the 4-wire SPI protocol ‘0’ - No interrupt pending. SMSC CAP1005 / CAP1006 29 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet ‘1’ - A touch has been detected on one or more channels and the interrupt has been asserted. 5.2 Status Registers Table 5.3 Status Registers ADDR 03h R/W R REGISTER Sensor Status B7 - B6 - B5 CS6 B4 CS5 B3 CS4 B2 CS3 B1 CS2 B0 CS1 DEFAULT 00h The Sensor Status Registers store status bits that indicate a touch has been detected. A value of ‘0’ in any bit indicates that no touch has been detected. A value of ‘1’ in any bit indicates that a touch has been detected. All status bits are cleared when the device enters the Deep Sleep (DSLEEP = ‘1’ - see Section 5.1). All status bits are cleared when the INT bit is cleared and if a touch on the respective Capacitive Touch Sensor is no longer present. If a touch is still detected, then the bits will not be cleared (but this will not cause the interrupt to be asserted - see Section 5.6). Bit 5 - CS6 - Indicates that a touch was detected on Sensor 6. Bit 4 - CS5 - Indicates that a touch was detected on Sensor 5. Bit 3 - CS4 - Indicates that a touch was detected on Sensor 4. Bit 2 - CS3 - Indicates that a touch was detected on Sensor 3. Bit 1 - CS2 - Indicates that a touch was detected on Sensor 2. Bit 0 - CS1 - Indicates that a touch was detected on Sensor 1. 5.3 Noise Flag Status Registers Table 5.4 Noise Flag Status Registers ADDR 0Ah R/W R REGISTER Noise Flag Status B7 - B6 - B5 CS6_ NOISE B4 CS5_ NOISE B3 CS4_ NOISE B2 CS3_ NOISE B1 CS2_ NOISE B0 CS1_ NOISE DEFAULT 00h The Noise Flag Status registers store status bits that are generated from the analog block if the detected noise is above the operating region of the analog detector. These bits indicate that the most recently received data from the sensor is invalid and should not be used for touch detection. Furthermore, so long as the bit is set for a particular channel, no decisions are made with the data. A touch is not detected, and a release is not detected. These bits are not sticky and will be cleared automatically if the analog block does not report a noise error. Revision 1.1 (08-05-09) 30 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet 5.4 Sensor Delta Count Registers Table 5.5 Sensor Delta Count Registers ADDR 10h 11h 12h 13h 14h 15h R/W R R R R R R REGISTER Sensor 1 Delta Count Sensor 2 Delta Count Sensor 3 Delta Count Sensor 4 Delta Count Sensor 5 Delta Count Sensor 6 Delta Count B7 Sign Sign Sign Sign Sign Sign B6 64 64 64 64 64 64 B5 32 32 32 32 32 32 B4 16 16 16 16 16 16 B3 8 8 8 8 8 8 B2 4 4 4 4 4 4 B1 2 2 2 2 2 2 B0 1 1 1 1 1 1 DEFAULT 00h 00h 00h 00h 00h 00h The Sensor Delta Count registers store the delta count that is compared against the threshold used to determine if a touch has been detected. The count value represents a change in input due to the capacitor associated with a touch on one of the sensors and is referenced to a calibrated base “Not touched” count value. The delta is an instantaneous change and is updated once per sensor per sensing cycle (see Section 4.2.1 - sensor cycle). The value presented is a standard 2’s complement number. In addition, the value is capped at a value of 7Fh. A reading of 7Fh indicates that the sensitivity settings are too high and should be adjusted accordingly (see Section 5.5). The value is also capped at a negative value of FFh for negative delta counts which may result upon a release. 5.5 Sensitivity Control Register Table 5.6 Sensitivity Control Register ADDR 1Fh R/W R/W REGISTER Sensitivity Control B7 - B6 B5 B4 B3 B2 B1 B0 DEFAULT 2Fh DELTA_SENSE[2:0] BASE_SHIFT[3:0] The Sensitivity Control register controls the sensitivity of a touch detection. Bits 6- 4 DELTA_SENSE[2:0] - Controls the sensitivity of a touch detection. The sensitivity settings act to scale the relative delta count value higher or lower based on the system parameters. A setting of 000b is the most sensitive while a setting of 111b is the least sensitive. At the more sensitive settings, touches are detected for a smaller delta C corresponding to a “lighter” touch. These settings are more sensitive to noise however and a noisy environment may flag more false touches than higher sensitivity levels. APPLICATION NOTE: A value of 128x is the most sensitive setting available. At the most sensitivity settings, the MSB of the Delta Count register represents 64 out of ~25,000 which corresponds to a touch of approximately 0.25% of the base capacitance (or a ΔC of 25fF from a 10pF base capacitance). Conversely a value of 1x is the least sensitive setting available. At these SMSC CAP1005 / CAP1006 31 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet settings, the MSB of the Delta Count register corresponds to a delta count of 8192 counts out of ~25,000 which corresponds to a touch of approximately 33% of the base capacitance (or a ΔC of 3.33pF from a 10pF base capacitance). Table 5.7 DELTA_SENSE Bit Decode DELTA_SENSE[2:0] 2 0 0 0 0 1 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 SENSITIVITY MULTIPLIER 128x (most sensitive) 64x 32x (default) 16x 8x 4x 2x 1x - (least sensitive) Bits 3 - 0 - BASE_SHIFT[3:0] - Controls the scaling and data presentation of the Base Count registers. The higher the value of these bits, the larger the range and the lower the resolution of the data presented. The scale factor represents the multiplier to the bit-weighting presented in these register descriptions. APPLICATION NOTE: The BASE_SHIFT[3:0] bits normally do not need to be updated. These settings will not affect touch detection or sensitivity. These bits are sometimes helpful in analyzing the Cap Sensing board performance and stability. Table 5.8 BASE_SHIFT Bit Decode BASE_SHIFT[3:0] 3 0 0 0 0 0 0 0 0 1 2 0 0 0 0 1 1 1 1 0 All others 1 0 0 1 1 0 0 1 1 0 0 0 1 0 1 0 1 0 1 0 DATA SCALING FACTOR 1x 2x 4x 8x 16x 32x 64x 128x 256x 256x (default = 1111b) 32 SMSC CAP1005 / CAP1006 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet 5.6 Configuration Register Table 5.9 Configuration Register ADDR 20h R/W R/W REGISTER Configuration B7 TIMEOUT B6 - B5 BLK_ DIG_ NOISE B4 BLK_ ANA_ NOISE B3 MAX_DUR_ EN B2 - B1 - B0 - DEFAULT 20h The Configuration register controls general global functionality that affects the entire device. Bit 7 - TIMEOUT - Enables the timeout and idle functionality of the SMBus protocol. ‘0’ (default) - The SMBus timeout and idle functionality are disabled. The SMBus interface will not time out if the clock line is held low. Likewise, it will not reset if both the data and clock lines are held high for longer than 150us. This is used for I2C compliance. ‘1’ - The SMBus timeout and idle functionality are enabled. The SMBus interface will time out if the clock line is held low for longer than 30ms. Likewise, it will reset if both the data and clock lines are held high for longer than 150us. Bit 5 - BLK_DIG_NOISE - Determines whether the digital noise threshold is used by the device. ‘0’ - The digital noise threshold is used. If a delta count value exceeds the noise threshold but does not exceed the touch threshold, then the sample is discarded and not used for the automatic recalibration routine. ‘1’ (default) - The noise threshold is not used. Any delta count that is less than the touch threshold is used for the automatic re-calibration routine. Bit 4 - BLK_ANA_NOISE - Determines whether the analog noise flag setting will block a touch detection as well as the analog calibration routine. ‘0’ (default) - If the analog noise bit is set, then a touch is blocked on the corresponding channel and will force the analog calibration routine to retry. ‘1’ - A touch is not blocked even if the analog noise bit is set. Likewise, the analog calibration routine will not retry if the analog noise bit is set. Bit 3 - MAX_DUR_EN - Determines whether the maximum duration recalibration is enabled for nongrouped sensors. ‘0’ (default) - The maximum duration recalibration functionality is disabled. A touch may be held indefinitely and no re-calibration will be performed on any sensor. ‘1’ - The maximum duration recalibration functionality is enabled. If a touch is held for longer than the MAX_DUR bit settings, then the re-calibration routine will be restarted (see Section 5.8). 5.7 Sensor Enable Registers Table 5.10 Sensor Enable Registers ADDR 21h R/W R/W REGISTER Sensor Enable B7 - B6 - B5 CS6_EN B4 CS5_EN B3 CS4_EN B2 CS3_EN B1 CS2_EN B0 CS1_EN DEFAULT 3Fh The Sensor Enable registers determine whether a Capacitive Touch Sensor input is included in the sampling cycle. The length of the sampling cycle is not affected by the number of sensors measured. Bit 5 - CS6_EN - Enables the CS6 input to be included during the sampling cycle. ‘0’ - The CS6 input is not included in the sampling cycle. SMSC CAP1005 / CAP1006 33 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet ‘1’ (default) - The CS6 input is included in the sampling cycle. Bit 4 - CS5_EN - Enables the CS5 input to be included during the sampling cycle. Bit 3 - CS4_EN - Enables the CS4 input to be included during the sampling cycle. Bit 2 - CS3_EN - Enables the CS3 input to be included during the sampling cycle. Bit 1 - CS2_EN - Enables the CS2 input to be included during the sampling cycle. Bit 0 - CS1_EN - Enables the CS1 input to be included during the sampling cycle. 5.8 Sensor Configuration Register Table 5.11 Sensor Configuration Register ADDR 22h R/W R/W REGISTER Sensor Configuration B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT A4h MAX_DUR[3:0] RPT_RATE[3:0] The Sensor Configuration Register controls timings associated with the Capacitive Sensor channels 1 - 6. Bits 7 - 4 - MAX_DUR[3:0] - (default 1010b) - Determines the maximum time that a sensor is allowed to be touched until the Capacitive Touch sensor is recalibrated as shown in Table 5.12. Revision 1.1 (08-05-09) 34 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Table 5.12 MAX_DUR Bit Decode MAX_DUR[3:0] 3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 TIME BEFORE RECALIBRATION 560ms 840ms 1120ms 1400ms 1680ms 2240ms 2800ms 3360ms 3920ms 4480ms 5600ms 6720ms 7840ms 8906ms 10080ms 11200ms Bits 3 - 0 - RPT_RATE[3:0] - (default 0100b) Determines the time duration between interrupt assertions when auto repeat is enabled. The resolution is 35ms the range is from 35ms to 560ms as shown in Table 5.13. Table 5.13 RPT_RATE Bit Decode RPT_RATE[3:0] OR M_PRESS[3:0] 3 0 0 0 0 0 0 0 2 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 0 0 1 0 1 0 1 0 INTERRUPT REPEAT RATE OR M_PRESS TIME 35ms 70ms 105ms 140ms 175ms 210ms 245ms SMSC CAP1005 / CAP1006 35 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Table 5.13 RPT_RATE Bit Decode (continued) RPT_RATE[3:0] OR M_PRESS[3:0] 3 0 1 1 1 1 1 1 1 1 2 1 0 0 0 0 1 1 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 INTERRUPT REPEAT RATE OR M_PRESS TIME 280ms 315ms 350ms 385ms 420ms 455ms 490ms 525ms 560ms 5.9 Sensor Configuration 2 Register Table 5.14 Sensor Configuration 2 Register ADDR 23h R/W R/W REGISTER Sensor Configuration 2 B7 - B6 - B5 - B4 - B3 B2 B1 B0 DEFAULT 07h M_PRESS[3:0] Bits 3- 0 - M_PRESS[3:0] - (default 0111b) - Determines the minimum amount of time that sensors configured to use auto repeat must detect a sensor touch to detect a “press and hold” event. If the sensor detects a touch for longer than the M_PRESS[3:0] settings, then a “press and hold” event is detected. This is the maximum amount of time that sensors can detect a sensor touch to differentiate between a “touch” and a “press and hold”. If a sensor detects a touch for less than or equal to the M_PRESS[3:0] settings, then a touch event is detected. The resolution is 35ms the range is from 35ms to 560ms as shown in Table 5.13. 5.10 Averaging and Sampling Configuration Register Table 5.15 Averaging and Sampling Configuration Register ADDR 24h R/W R/W REGISTER Averaging and Sampling Config B7 B6 B5 B4 AVG[2:0] B3 B2 SAMP_ TIME B1 B0 DEFAULT 1Dh CYCLE_TIME [1:0] The Averaging and Sampling Configuration register controls the number of samples taken and the total sensor cycle time for all active sensors while the device is functioning normally. Bits 5 - 3 - AVG[2:0] - Determines the number of samples that are taken for all active channels during the sensor cycle as shown in Table 5.16. All samples are taken consecutively on the same channel Revision 1.1 (08-05-09) 36 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet before the next channel is sampled and the result is averaged over the number of samples measured before updating the measured results. For example, if CS1, CS2, and CS3 are sampled during the sensor cycle, and the AVG[2:0] bits are set to take 4 samples per channel, then the full sensor cycle will be: CS1, CS1, CS1, CS1, CS2, CS2, CS2, CS2, CS3, CS3, CS3, CS3. Table 5.16 AVG Bit Decode AVG[2:0] 2 0 0 0 0 1 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 NUMBER OF SAMPLES TAKEN PER MEASUREMENT 1 2 4 8 (default) 16 32 64 128 Bit 2 - SAMP_TIME - Determines the time to take a single sample. ‘0’ - The sampling time is ~2.56ms. ‘1’ (default) - The sampling time is ~1.28ms. Bits 1 - 0 - CYCLE_TIME[1:0] - Determines the overall cycle time for all measured channels during normal operation as shown in Table 5.17. All measured channels are sampled at the beginning of the cycle time. If additional time is remaining, then the device is placed into a lower power state for the remaining duration of the cycle. Table 5.17 CYCLE_TIME Bit Decode CYCLE_TIME[1:0] 1 0 0 1 1 0 0 1 0 1 OVERALL CYCLE TIME 35ms 70ms (default) 105ms 140ms APPLICATION NOTE: The programmed cycle time is only maintained if the total averaging time for all samples is less than the programmed cycle. The AVG[2:0] bits will take priority so that if more samples are required than would normally be allowed during the cycle time, the cycle time will be extended as necessary to accommodate the number of samples to be measured. SMSC CAP1005 / CAP1006 37 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet 5.11 Calibration Activate Registers Table 5.18 Calibration Activate Registers ADDR 26h R/W R/W REGISTER Calibration Activate B7 - B6 - B5 CS6_CAL B4 CS5_CAL B3 CS4_CAL B2 CS3_CAL B1 CS2_CAL B0 CS1_CAL DEFAULT FFh The Calibration Activate register force the respective sensors to be re-calibrated. When a bit is set, the corresponding Capacitive Touch Sensor will be re-calibrated and the bit will be automatically cleared once the re-calibration routine has finished. During the re-calibration routine, the sensors will not detect a press for up to 600ms and the Sensor Base Count register values will be invalid. During this time, any press on the corresponding sensors will invalidate the re-calibration. Bit 5 - CS6_CAL - When set, the CS6 input is re-calibrated. This bit is automatically cleared once the sensor has been re-calibrated successfully. Bit 4 - CS5_CAL - When set, the CS5 input is re-calibrated. This bit is automatically cleared once the sensor has been re-calibrated successfully. Bit 3 - CS4_CAL - When set, the CS4 input is re-calibrated. This bit is automatically cleared once the sensor has been re-calibrated successfully. Bit 2 - CS3_CAL - When set, the CS3 input is re-calibrated. This bit is automatically cleared once the sensor has been re-calibrated successfully. Bit 1 - CS2_CAL - When set, the CS2 input is re-calibrated. This bit is automatically cleared once the sensor has been re-calibrated successfully. Bit 0 - CS1_CAL - When set, the CS1 input is re-calibrated. This bit is automatically cleared once the sensor has been re-calibrated successfully. 5.12 Interrupt Enable Register Table 5.19 Interrupt Enable Register ADDR 27h R/W R/W REGISTER Interrupt Enable B7 - B6 - B5 CS6_ INT_EN B4 CS5_ INT_EN B3 CS4_ INT_EN B2 CS3_ INT_EN B1 CS2_ INT_EN B0 CS1_ INT_EN DEFAULT 3Fh The Interrupt Enable registers determine whether a sensor touch or release causes the interrupt pin to be asserted. Bit 5 - CS6_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS6 (associated with the CS6 status bit). ‘0’ - The interrupt pin will not be asserted if a touch is detected on CS6 (associated with the CS6 status bit). ‘1’ (default) - The interrupt pin will be asserted a touch is detected on CS6 (associated with the CS6 status bit). Bit 4 - CS5_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS5 (associated with the CS5 status bit). Bit 3 - CS4_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS4 (associated with the CS4 status bit). Revision 1.1 (08-05-09) 38 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Bit 2 - CS3_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS3 (associated with the CS3 status bit). Bit 1 - CS2_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS2 (associated with the CS2 status bit). Bit 0 - CS1_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS1 (associated with the CS1 status bit). 5.13 Repeat Rate Enable Register Table 5.20 Repeat Rate Enable Register ADDR 28h R/W R/W REGISTER Repeat Rate Enable B7 - B6 - B5 CS6_ RPT_EN B4 CS5_ RPT_EN B3 CS4_ RPT_EN B2 CS3_ RPT_EN B1 CS2_ RPT_EN B0 CS1_ RPT_EN DEFAULT 3Fh The Repeat Rate Enable register determines the interrupt behavior of the buttons as described in Section 4.3.1. Bit 5 - CS6_RPT_EN - Enables the repeat rate for Capacitive Touch Sensor 6. ‘0’ - The repeat rate for CS6 is disabled. It will only generate an interrupt when a touch is detected and when a release is detected no matter how long the touch is held for. ‘1’ (default) - The repeat rate for CS6 is enabled. In the case of a “touch” event, it will generate an interrupt when a touch is detected and a release is detected. In the case of a “press and hold” event, it will generate an interrupt when a touch is detected and at the repeat rate so long as the touch is held. It will not generate an interrupt when a release is detected. Bit 4 - CS5_RPT_EN - Enables the repeat rate for Capacitive Touch Sensor 5. Bit 3 - CS4_RPT_EN - Enables the repeat rate for Capacitive Touch Sensor 4. Bit 2 - CS3_RPT_EN - Enables the repeat rate for Capacitive Touch Sensor 3. Bit 1 - CS2_RPT_EN - Enables the repeat rate for Capacitive Touch Sensor 2. Bit 0 - CS1_RPT_EN - Enables the repeat rate for Capacitive Touch Sensor 1. 5.14 Multiple Touch Configuration Register Table 5.21 Multiple Touch Configuration ADDR 2Ah R/W R/W REGISTER Multiple Touch Config B7 MULT_ BLK_EN B6 - B5 - B4 - B3 B2 B1 - B0 - DEFAULT 80h B_MULT_T[1:0] The Multiple Touch Configuration register controls the settings for the multiple touch detection circuitry. These settings determine the number of simultaneous buttons that may be pressed before action is taken. Bit 7 - MULT_BLK_EN - Enables the multiple button blocking circuitry. ‘0’ - The multiple touch circuitry is disabled. The device will not block multiple touches. ‘1’ (default)- The multiple touch circuitry is enabled. The device will accept the number of touches equal to programmed multiple touch threshold and block all others. It will remember which sensor is valid and block all others until that sensor has been released. SMSC CAP1005 / CAP1006 39 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Bits 3 - 2 - B_MULT_T[1:0] - Determines the number of simultaneous touches on all sensors before a Multiple Touch Event is detected and sensors are blocked. The bit decode is given by Table 5.22. Table 5.22 B_MULT_T Bit Decode B_MULT_T[1:0] 1 0 0 1 1 0 0 1 0 1 NUMBER OF SIMULTANEOUS TOUCHES 1 (default) 2 3 4 5.15 Recalibration Configuration Register Table 5.23 Recalibration Configuration Registers ADDR 2Fh R/W R/W REGISTER Recalibration Configuration B7 BUT_ LD_TH B6 - B5 - B4 B3 B2 B1 CAL_CFG[2:0] B0 DEFAULT 8Bh NEG_DELTA_ CNT[1:0] The Recalibration Configuration register controls the automatic re-calibration routine settings as well as advanced controls to program the Sensor Threshold register settings. Bit 7 - BUT_LD_TH - Enables setting all Sensor Threshold registers by writing to the Sensor 1 Threshold register. ‘0’ - Each Sensor X Threshold register is updated individually. ‘1’ (default) - Writing the Sensor 1 Threshold register will automatically overwrite the Sensor Threshold registers for all sensors (Sensor Threshold 1 through Sensor Threshold 6). The individual Sensor X Threshold registers (Sensor 2 Threshold through Sensor 6 Threshold) can be individually updated at any time. Bits 4 - 3 - NEG_DELTA_CNT[1:0] - Determines the number of negative delta counts necessary to trigger a digital re-calibration as shown in Table 5.24. Table 5.24 NEG_DELTA_CNT Bit Decode NEG_DELTA_CNT[1:0] 1 0 0 1 1 0 0 1 0 1 NUMBER OF CONSECUTIVE NEGATIVE DELTA COUNT VALUES 8 16 (default) 32 None (disabled) Revision 1.1 (08-05-09) 40 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Bits 2 - 0 - CAL_CFG[2:0] - Determines the update time and number of samples of the automatic recalibration routine. The settings applies to all sensors universally (though individual sensors can be configured to support re-calibration - see Section 5.11). Table 5.25 CAL_CFG Bit Decode CAL_CFG[2:0] 2 0 0 0 0 1 1 1 1 Note 5.1 1 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 RECALIBRATION SAMPLES (SEE Note 5.1) 16 32 64 256 256 256 256 256 UPDATE TIME (SEE Note 5.2) 16 32 64 256 (default) 1024 2048 4096 7936 Recalibration Samples refers to the number of samples that are measured and averaged before the Base Count is updated however does not control the base count update period. Once this target number of update cycles is reached, the device may wait additional time as determined by the Update Time before the base count is updated as determiend by the settings. Update Time refers to the amount of time (in polling cycle periods) that elapses before the Base Count is updated. For those settings that have the Update Time greater than the Recalibration Samples value, the device will wait (and continue to average the updated base count) until the Update Time has elapsed before the base count is updated. Note 5.2 5.16 Sensor Threshold Registers Table 5.26 Sensor Threshold Registers ADDR 30h 31h 32h 33h 34h 35h R/W R/W R/W R/W R/W R/W R/W REGISTER Sensor 1 Threshold Sensor 2 Threshold Sensor 3 Threshold Sensor 4 Threshold Sensor 5 Threshold Sensor 6 Threshold B7 - B6 64 64 64 64 64 64 B5 32 32 32 32 32 32 B4 16 16 16 16 16 16 B3 8 8 8 8 8 8 B2 4 4 4 4 4 4 B1 2 2 2 2 2 2 B0 1 1 1 1 1 1 DEFAULT 40h 40h 40h 40h 40h 40h SMSC CAP1005 / CAP1006 41 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet The Sensor Threshold registers store the delta threshold that is used to determine if a touch has been detected. When a touch occurs, the input signal of the corresponding sensor changes due to the capacitance associated with a touch. If the sensor input change exceeds the threshold settings, then a touch is detected. When the BUT_LD_TH bit is set (see Section 5.15 - bit 7), writing data to the Sensor 1 Threshold register will update all of the sensor threshold registers (31h - 37h inclusive). 5.17 Sensor Noise Threshold Registers Table 5.27 Sensor Noise Threshold Registers ADDR 38h 39h R/W R/W R/W REGISTER Sensor Noise Threshold 1 Sensor Noise Threshold 2 B7 B6 B5 B4 B3 B2 B1 B0 DEFAULT 55h 55h CS4_BN_TH [1:0] 0 1 CS3_BN_TH [1:0] 0 1 CS2_BN_TH [1:0] CS6_BN_TH [1:0] CS1_BN_TH [1:0] CS5_BN_TH [1:0] The Sensor Noise Threshold registers control the value of a secondary internal threshold to detect noise and improve the automatic recalibration routine. If a Capacitive Touch Sensor output exceeds the Sensor Noise Threshold but does not exceed the sensor threshold, then it is determined to be caused by a noise spike. That sample is not used by the automatic re-calibration routine. The Sensor Noise Threshold is proportional to the programmed threshold as shown in Table 5.28. Table 5.28 CSx_BN_TH Bit Decode CSX_BN_TH[1:0] 1 0 0 1 1 0 0 1 0 1 THRESHOLD DIVIDE SETTING 25% 37.5% (default) 50% 62.5% 5.17.1 Sensor Noise Threshold 1 Register The Sensor Noise Threshold 1 register controls the noise threshold for Capacitive Touch Sensors 1-4. Bits 7-6 - CS4_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 4. Bits 5-4 - CS3_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 3. Bits 3-2 - CS2_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 2. Bits 1-0 - CS1_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 1. 5.17.2 Sensor Noise Threshold 2 Register The Sensor Noise Threshold 2 register controls the noise threshold for Capacitive Touch Sensors 5 - 6. Bits 3-2 - CS6_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 6. Revision 1.1 (08-05-09) 42 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Bits 1-0 - CS5_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 5. 5.18 Standby Channel Register Table 5.29 Standby Channel Register ADDR 40h R/W R/W REGISTER Standby Channel B7 - B6 - B5 CS6_ STBY B4 CS5_ STBY B3 CS4_ STBY B2 CS3_ STBY B1 CS2_ STBY B0 CS1_ STBY DEFAULT 00h The Standby Channel register controls which (if any) Capacitive Touch Sensors are active during Standby. Bit 5 - CS6_STBY - Controls whether the CS6 channel is active in Standby. ‘0’ (default) - The CS6 channel not be sampled during Standby mode. ‘1’ - The CS6 channel will be sampled during Standby Mode. It will use the Standby threshold setting, and the standby averaging and sensitivity settings. Bit 4 - CS5_STBY - Controls whether the CS5 channel is active in Standby. Bit 3 - CS4_STBY - Controls whether the CS4 channel is active in Standby. Bit 2 - CS3_STBY - Controls whether the CS3 channel is active in Standby. Bit 1 - CS2_STBY - Controls whether the CS2 channel is active in Standby. Bit 0 - CS1_STBY - Controls whether the CS1 channel is active in Standby. 5.19 Standby Configuration Register Table 5.30 Standby Configuration Register ADDR R/W REGISTER Standby Configuration B7 AVG_ SUM B6 B5 B4 B3 B2 STBY_ SAMP_ TIME B1 B0 DEFAULT 41h R/W - STBY_AVG[2:0] STBY_CY_TIME [1:0] 1Dh The Standby Configuration register controls averaging and cycle time for those sensors that are active in Standby. Bit 7 - AVG_SUM - Determines whether the active sensors will average the programmed number of samples or whether they will accumulate for the programmed number of samples. ‘0’ - (default) - The active sensor delta count values will be based on the average of the programmed number of samples when compared against the threshold. ‘1’ - The active sensor delta count values will be based on the summation of the programmed number of samples when compared against the threshold. Bits 5 - 3 - STBY_AVG[2:0] - Determines the number of samples that are taken for all active channels during the sensor cycle as shown in Table 5.31. All samples are taken consecutively on the same channel before the next channel is sampled and the result is averaged over the number of samples measured before updating the measured results. SMSC CAP1005 / CAP1006 43 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Table 5.31 STBY_AVG Bit Decode STBY_AVG[2:0] 2 0 0 0 0 1 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 NUMBER OF SAMPLES TAKEN PER MEASUREMENT 1 2 4 8 (default) 16 32 64 128 Bit 2 - STBY SAMP_TIME - Determines the time to take a single sample when the device is in Standby. ‘0’ - The sampling time is ~2.56ms. ‘1’ (default) - The sampling time is ~1.28ms. Bits 1 - 0 - STBY_CY_TIME[2:0] - Determines the overall cycle time for all measured channels during normal operation as shown in Table 5.17. All measured channels are sampled at the beginning of the cycle time. If additional time is remaining, then the device is placed into a lower power state for the remaining duration of the cycle. Table 5.32 STBY_CY_TIME Bit Decode STBY_CY_TIME[1:0] 1 0 0 1 1 0 0 1 0 1 OVERALL CYCLE TIME 35ms 70ms (default) 105ms 140ms APPLICATION NOTE: The programmed cycle time is only maintained if the total averaging time for all samples is less than the programmed cycle. The STBY_AVG[2:0] bits will take priority so that if more samples are required than would normally be allowed during the cycle time, the cycle time will be extended as necessary to accommodate the number of samples to be measured. Revision 1.1 (08-05-09) 44 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet 5.20 Standby Sensitivity Register Table 5.33 Standby Configuration Register ADDR 42h R/W R/W REGISTER Standby Sensitivity B7 - B6 - B5 - B4 - B3 - B2 B1 B0 DEFAULT 02h STBY_SENSE[2:0] The Standby Sensitivity register controls the sensitivity for sensors that are active in Standby. Bits 2 - 0 - STBY_SENSE[2:0] - Controls the sensitivity for sensors that are active in Standby. The sensitivity settings act to scale the relative delta count value higher or lower based on the system parameters. A setting of 000b is the most sensitive while a setting of 111b is the least sensitive. At the more sensitive settings, touches are detected for a smaller delta C corresponding to a “lighter” touch. These settings are more sensitive to noise however and a noisy environment may flag more false touches than higher sensitivity levels. APPLICATION NOTE: A value of 128x is the most sensitive setting available. At the most sensitivity settings, the MSB of the Delta Count register represents 64 out of ~25,000 which corresponds to a touch of approximately 0.25% of the base capacitance (or a ΔC of 25fF from a 10pF base capacitance). Conversely a value of 1x is the least sensitive setting available. At these settings, the MSB of the Delta Count register corresponds to a delta count of 8192 counts out of ~25,000 which corresponds to a touch of approximately 33% of the base capacitance (or a ΔC of 3.33pF from a 10pF base capacitance). Table 5.34 STBY_SENSE Bit Decode STBY_SENSE[2:0] 2 0 0 0 0 1 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 SENSITIVITY MULTIPLIER 128x (most sensitive) 64x 32x (default) 16x 8x 4x 2x 1x - (least sensitive) 5.21 Standby Threshold Register Table 5.35 Standby Threshold Register ADDR 43h R/W R/W REGISTER Standby Threshold B7 - B6 64 B5 32 B4 16 B3 8 B2 4 B1 2 B0 1 DEFAULT 40h SMSC CAP1005 / CAP1006 45 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet The Standby Threshold registers stores the delta threshold that is used to determine if a touch has been detected. When a touch occurs, the input signal of the corresponding sensor changes due to the capacitance associated with a touch. If the sensor input change exceeds the threshold settings, then a touch is detected. 5.22 Sensor Base Count Registers Table 5.36 Sensor Base Count Registers ADDR 50h 51h 52h 53h 54h 55h R/W R R R R R R REGISTER Sensor 1 Base Count Sensor 2 Base Count Sensor 3 Base Count Sensor 4 Base Count Sensor 5 Base Count Sensor 6 Base Count B7 128 128 128 128 128 128 B6 64 64 64 64 64 64 B5 32 32 32 32 32 32 B4 16 16 16 16 16 16 B3 8 8 8 8 8 8 B2 4 4 4 4 4 4 B1 2 2 2 2 2 2 B0 1 1 1 1 1 1 DEFAULT C8h C8h C8h C8h C8h C8h The Sensor Base Count registers store the calibrated “Not Touched” input value from the Capacitive Touch Sensor inputs. These registers are periodically updated by the re-calibration routine. The routine uses an internal adder to add the current count value for each reading to the sum of the previous readings until sample size has been reached. At this point, the upper 16 bits are taken and used as the Sensor Base Count. The internal adder is then reset and the re-calibration routine continues. The data presented is determined by the BASE_SHIFT[3:0] bits (see Section 5.5). APPLICATION NOTE: 5.23 Product ID Register Table 5.37 Product ID Register ADDR R/W REGISTER Product ID CAP1006 B7 0 0 B6 1 1 B5 0 0 B4 0 0 B3 0 0 B2 1 1 B1 0 0 B0 0 1 DEFAULT 44h 45h FDh R Product ID CAP1005 The Product ID register stores a unique 8-bit value that identifies the device. Revision 1.1 (08-05-09) 46 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet 5.24 Manufacturer ID Register Table 5.38 Vendor ID Register ADDR FEh R/W R REGISTER Manufacturer ID B7 0 B6 1 B5 0 B4 1 B3 1 B2 1 B1 0 B0 1 DEFAULT 5Dh The Vendor ID register stores an 8-bit value that represents SMSC. 5.25 Revision Register Table 5.39 Revision Register ADDR FFh R/W R REGISTER Revision B7 1 B6 0 B5 0 B4 0 B3 0 B2 0 B1 0 B0 1 DEFAULT 81h The Revision register stores an 8-bit value that represents the part revision. SMSC CAP1005 / CAP1006 47 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Chapter 6 Package Information 6.1 CAP1006 and CAP1005 Package Drawings Figure 6.1 10-Pin DFN 3mm x 3mm Package Drawing Revision 1.1 (08-05-09) 48 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Figure 6.2 10-Pin DFN 3mm x 3mm Package Dimensions Figure 6.3 10-Pin DFN 3mm x 3mm PCB Footprint SMSC CAP1005 / CAP1006 49 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet 6.2 Package Marking TOP LINE 1: Device ID, First 2 of last 6 digits of Lot Number LINE 2: Last 4 digits of Lot Number 12 2x 0.6 e4 PIN 1 PB-FREE/GREEN SYMBOL (Ni/Pd PP-LF) LINES 1 & 2: CENTER HORIZONTAL ALIGNMENT LINE 3: AS SHOWN BOTTOM BOTTOM MARKING IS NOT ALLOWED Figure 6.4 CAP1006-1 Package Markings TOP LINE 1: Device ID, First 2 of last 6 digits of Lot Number LINE 2: Last 4 digits of Lot Number 13 2x 0.6 e4 PIN 1 PB-FREE/GREEN SYMBOL (Ni/Pd PP-LF) LINES 1 & 2: CENTER HORIZONTAL ALIGNMENT LINE 3: AS SHOWN BOTTOM BOTTOM MARKING IS NOT ALLOWED Figure 6.5 CAP1006-2 Package Markings Revision 1.1 (08-05-09) 50 SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet TOP LINE 1: Device ID, First 2 of last 6 digits of Lot Number LINE 2: Last 4 digits of Lot Number 11 2x 0.6 e4 PIN 1 PB-FREE/GREEN SYMBOL (Ni/Pd PP-LF) LINES 1 & 2: CENTER HORIZONTAL ALIGNMENT LINE 3: AS SHOWN BOTTOM BOTTOM MARKING IS NOT ALLOWED Figure 6.6 CAP1005 Package Markings SMSC CAP1005 / CAP1006 51 Revision 1.1 (08-05-09) DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Chapter 7 Revision History Table 7.1 Customer Revision History REVISION LEVEL & DATE Rev. 1.1 (08-05-09) SECTION/FIGURE/ENTRY Features General Description Table 2.2, "Electrical Specifications" CORRECTION “TBD” replaced with “3uA” under Low Power Operation Deep sleep drawing “5uA” of current changed to “3uA” Table updated: - Current Measurement, ISTBY - changed the typical column to 160, max to 210. Changed the conditions to read: " Standby state active, one sensor monitored, default conditions (8 avg, 70ms cycle time)" - Current Measurement, IDSLEEP -changed the TYP column value to 3 and max to 10. Section 3.1.1, "SMBus (I2C) Communications" Section 6.2, "Package Marking" Rev. 1.0 (06-16-09) Document title modified; reel size added to ordering information; updates to pinout, general description and register set. “System RESET pin” removed from features Chapter 1, Pin Description Table 2.1, "Absolute Maximum Ratings" Figure 3.1, "SPI Timing" Section 3.6, "BC-Link Interface (CAP1006-2 only)" Chapter 4, General Description Section 4.1, "Power States" Table 5.1, "Register Set in Hexadecimal Order" Section 6.2, "Package Marking" Rev. 0.56 (5/1/09) General Section 5.5, "Sensitivity Control Register" Revision 1.1 (08-05-09) 52 The following text deleted: “The SPI_CS# pin is not used and any data presented to this pin will be ignored.” Updated package markings per new standards Pin tables modified adding SPI to “ALERT# / BC_IRQ#” pin Notes following table modified Updated figure Removed “8051” from 2nd paragraph Second to last paragraph removed, not needed as clarification follows Removed mention of LED driver outputs Updated text and register descriptions for incorrect #’s Cap Sense channels Updated package markings Fixed typos and updated text as necessary. Cleaned up system diagrams Renamed bit fields SMSC CAP1005 / CAP1006 DATASHEET 5 and 6 Channel Capacitive Touch Sensor Datasheet Table 7.1 Customer Revision History (continued) REVISION LEVEL & DATE SECTION/FIGURE/ENTRY Section 5.6, "Configuration Register" Rev. 0.53 (4/23/09) Rev. 0.52 (4/17/09) Section 3.4, "SPI Interface (CAP1005 only)" General CORRECTION Renamed bits 5 and 6 Updated section to describe Normal operation Initial document creation SMSC CAP1005 / CAP1006 53 Revision 1.1 (08-05-09) DATASHEET