EMC6D103-CZC

EMC6D103 Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features PRODUCT FEATURES „ „ „ Datasheet 3.3 Volt Operation (5 Volt Tolerant Input Buffers) SMBus 2.0 Compliant Interface (Fixed, not Discoverable) with Three Slave Address Options Fan Control — PWM (Pulse width Modulation) Outputs (3) — Fan Tachometer Inputs (4) — Programmable automatic fan control based on temperature — Backwards compatible with fans requiring lower frequency PWM drive — High frequency fan support for 4 wire fans — One fan can be controlled from as many as 3 temperature zones — Fan ramp rate control for acoustic noise reduction „ Power Savings Modes „ — Monitoring of Two Remote Thermal Diodes (+/- 3 deg C accuracy) — Internal Ambient Temperature Measurement — Limit Comparison of all Monitored Values — Interrupt Pin for out-of-limit Temperature Indication — Configurable offset for internal or external temperature channels. „ Voltage Monitor — Monitor Power supplies (+2.5V, +5V, +12V, Vccp, and VCC) — Limit Comparison of all Monitored Values — Interrupt Pin for out-of-limit Voltage Indication „ „ — Two monitoring modes: continuous or cycling (for power savings) — Two low power modes when monitoring if off: Sleep and Shutdown Temperature Monitor „ 5 VID (Voltage Identification) Inputs XOR Tree Test Mode 24-Pin, SSOP Lead-Free RoHS Compliant Packages ORDER NUMBERS: EMC6D103-CZC FOR 24 PIN, SSOP LEAD-FREE ROHS COMPLIANT PACKAGE EMC6D103-CZC-TR FOR 24 PIN, SSOP LEAD-FREE ROHS COMPLIANT PACKAGE (TAPE AND REEL) EVALUATION BOARD IS AVAILABLE SMSC EMC6D103 DATASHEET Revision 0.3 (03-01-07) Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features Datasheet 80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123 Copyright © 2007 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 0.3 (03-01-07) 2 DATASHEET SMSC EMC6D103 Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features Datasheet Table of Contents Chapter 1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Chapter 2 Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.1 EMC6D103 Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Chapter 3 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.1 3.2 3.3 Pin Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Buffer Type Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.3V Operation, 5V Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Chapter 4 Operational Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.1 4.2 Maximum Guaranteed Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Ratings for Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Chapter 5 SMBus Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 5.10 Slave Address. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Slave Bus Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bus Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Invalid Protocol Response Behavior. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.4.1 Undefined Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General Call Address Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Slave Device Time-Out. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Stretching the SCLK Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SMBus Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bus Reset Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SMBus Alert Response Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 18 18 19 19 19 20 20 20 20 20 Chapter 6 Hardware Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 6.10 Input Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Resetting the EMC6D103 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.2.1 Power-On Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.2.2 Soft Reset (Initialization) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Monitoring Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.3.1 Continuous Monitoring Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.3.2 Cycle Monitoring Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interrupt Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4.1 Diode Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interrupt Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Low Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.6.1 Sleep Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.6.2 Shutdown Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Analog Voltage Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Voltage ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Temperature Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.9.1 Internal Temperature Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.9.2 External Temperature Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.9.3 Temperature Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.9.4 Offset Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Thermal Zones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 22 22 22 22 24 24 25 26 27 28 28 28 28 29 29 29 29 30 31 31 Chapter 7 Fan Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 SMSC EMC6D103 3 DATASHEET Revision 0.3 (03-01-07) Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features Datasheet 7.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.1.1 Limit and Configuration Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.1.2 Device Set-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.1.3 PWM Fan Speed Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.1.4 Fan Speed Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.1.5 Linking Fan Tachometers to PWMs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 32 32 33 41 47 Chapter 8 Register Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 8.1 8.2 Undefined Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Defined Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.1 Register 10h: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.2 Register 1Dh, 1Eh, 1Fh: Offset Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.3 Registers 20-24h: Voltage Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.4 Registers 25-27h: Temperature Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.5 Registers 28-2Fh: Fan Tachometer Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.6 Registers 30-32h: Current PWM Duty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.7 Register 3Eh: Company ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.8 Register 3Fh: Version / Stepping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.9 Register 40h: Ready/Lock/Start Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.10 Register 41h: Interrupt Status Register 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.11 Register 42h: Interrupt Status Register 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.12 Register 43h: VID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.13 Registers 44-4Dh: Voltage Limit Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.14 Registers 4E-53h: Temperature Limit Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.15 Registers 54-5Bh: Fan Tachometer Low Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.16 Registers 5C-5Eh: PWM Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.17 Registers 5F-61h: Zone Temperature Range, PWM Frequency . . . . . . . . . . . . . . . . . . . 8.2.18 Register 62h, 63h: Min/Off, PWM Ramp Rate Control . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.19 Registers 64-66h: Minimum PWM Duty Cycle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.20 Registers 67-69h: Zone Low Temperature Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.21 Registers 6A-6Ch: Absolute Temperature Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.22 Registers 6D-6Eh: Zone Hysteresis Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.23 Register 6F: XOR Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.24 Register 79h: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.25 Register 7Ah: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.26 Register 7Bh: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.27 Register 7Ch: Special Function Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.28 Register 7Eh: Interrupt Enable 1 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.29 Register 7Fh: Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.30 Register 80h: Interrupt Enable 2 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.31 Register 81h: TACH_PWM Association Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.32 Register 82h: Interrupt Enable 3 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.33 Registers 85h-88h: A/D Converter LSbs Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.34 Register 89h: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.35 Registers 8Ah: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.36 Registers 8Bh: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.37 Registers 8Ch: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.38 Registers 8Dh: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.39 Registers 8Eh: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.40 Registers 90h-93h: TachX Option Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.41 Registers 94h-96h: PWMx Option Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.42 Register 97h: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.43 Register 98h:SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2.44 Register FFh: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Revision 0.3 (03-01-07) 4 DATASHEET 54 54 54 54 55 56 57 57 59 59 59 61 62 63 64 65 66 66 68 70 71 72 73 74 74 75 75 75 76 77 78 78 79 80 81 81 81 81 82 82 82 82 83 84 84 85 SMSC EMC6D103 Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features Datasheet Chapter 9 Timing Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 9.1 9.2 PWM Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 SMBus Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87 Chapter 10 Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 Appendix A ADC Voltage Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 Appendix B Example Fan Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 SMSC EMC6D103 5 DATASHEET Revision 0.3 (03-01-07) Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features Datasheet List of Figures Figure 2.1 Figure 5.1 Figure 6.1 Figure 7.1 Figure 7.2 Figure 7.3 Figure 7.4 Figure 7.5 Figure 8.1 Figure 9.1 Figure 9.2 Figure 10.1 Figure B.1 Figure B.2 Figure B.3 Figure B.4 Figure B.5 EMC6D103 24 Pin SSOP Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Address Selection on EMC6D103 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interrupt Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Automatic Fan Control Flow Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Automatic Fan Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Spin Up Reduction Enabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Illustration of PWM Ramp Rate Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PWM and Tachometer Concept. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fan Activity Above Fan Temp Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PWMx Output Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SMBus Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-Pin SSOP Package Outline, 0.150” Wide Body, 0.025” Pitch. . . . . . . . . . . . . . . . . . . . . . Fan Drive Circuitry (Apply to PWM Driving Two Fans) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fan Drive Circuitry (Apply to PWM Driving One Fan) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fan Tachometer Circuitry (Apply to Each Fan) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Remote Diode (Apply to Remote2 Lines). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Suggested Minimum Track Width and Spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Revision 0.3 (03-01-07) 6 DATASHEET 10 18 26 35 37 38 40 43 68 86 87 88 90 91 91 92 92 SMSC EMC6D103 Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features Datasheet List of Tables Table 3.1 Pin Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 3.2 Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 5.1 SMBus Slave Address Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 5.2 SMBus Write Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 5.3 SMBus Read Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 5.4 Modified SMBus Receive Byte Protocol Response to ARA. . . . . . . . . . . . . . . . . . . . . . . . . . . Table 6.1 AVG[2:0] Bit Decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 6.2 Conversion Cycle Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 6.3 ADC Conversion Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 6.4 Low Power Mode Control Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 6.5 Min/Max ADC Conversion Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 6.6 Temperature Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 7.1 PWM Ramp Rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 7.2 Max Tachometer Count Values for Different Stretch Periods . . . . . . . . . . . . . . . . . . . . . . . . . Table 7.3 Minimum RPM Detectable Using 3 Edges – No PWM Stretching . . . . . . . . . . . . . . . . . . . . . . Table 7.4 Minimum RPM Detectable Using 2 Edges – No PWM Stretching . . . . . . . . . . . . . . . . . . . . . . Table 7.5 Minimum RPM Detectable– With PWM Stretching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.1 Register Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.2 Register 10h: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.3 Register 1Dh, 1Eh, 1Fh: Offset Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.4 Registers 20-24h: Voltage Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.5 Voltage vs. Register Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.6 Registers 25-27h: Temperature Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.7 Temperature vs. Register Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.8 Registers 28-2Fh: Fan Tachometer Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.9 Registers 30-32h: Current PWM Duty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.10 PWM Duty vs Register Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.11 Register 3Eh: Company ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.12 Register 3Fh: Version / Stepping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.13 Register 40h: Ready/Lock/Start Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.14 Ready/Lock/Start Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.15 Register 41h: Interrupt Status Register 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.17 Register 42h: Interrupt Status Register 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.19 Register 43h: VID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.20 Registers 44-4Dh: Voltage Limit Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.22 Registers 4E-53h: Temperature Limit Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.23 Temperature Limits vs. Register Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.24 Registers 54-5Bh: Fan Tachometer Low Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.25 Registers 5C-5Eh: PWM Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.26 Fan Zone Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.27 Fan Spin-Up Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.28 Registers 5F-61h: Zone Temperature Range, PWM Frequency . . . . . . . . . . . . . . . . . . . . . . . Table 8.29 Register Setting vs. PWM Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.30 Register Setting vs. Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.31 Register 62h, 63h: Min/Off, PWM Ramp Rate Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.32 PWM output below Limit depending on value of Off/Min . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.33 PWM Ramp Rate Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.34 Registers 64-66h: Minimum PWM Duty Cycle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.35 PWM Duty vs. Register Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.36 Registers 67-69h: Zone Low Temperature Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.37 Temperature Limit vs. Register Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.38 egisters 6A-6Ch: Absolute Temperature Limit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.39 Absolute Limit vs. Register Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SMSC EMC6D103 7 DATASHEET 11 12 17 19 19 20 23 23 24 28 29 30 39 45 46 46 47 49 54 54 55 55 56 56 57 57 58 59 59 59 60 61 62 63 64 65 65 66 66 67 68 68 69 69 70 70 71 71 72 72 72 73 73 Revision 0.3 (03-01-07) Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features Datasheet Table 8.40 Registers 6D-6Eh: Zone Hysteresis Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.41 Hysteresis Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.42 Register 6F: XOR Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.43 Register 79h: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.44 Register 7Ah: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.45 Register 7Bh: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.46 Register 7Ch: Special Function Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.47 AVG[2:0] Bit Decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.48 Register 7Eh: Interrupt Enable 1 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.49 Register 7Fh: Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.50 Register 80h: Interrupt Enable 2 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.51 Register 81h: TACH_PWM Association Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.53 Register 82h: Interrupt Enable 3 Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.54 Registers 85h-88h: A/D Converter LSbs Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.55 Register 89h: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.56 Registers 8Ah: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.57 Registers 8Bh: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.58 Registers 8Ch: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.59 Registers 8Dh: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.60 Registers 8Eh: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.61 Registers 90h-93h: TachX Option Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.62 Registers 94h-96h: PWMx Option Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.63 Register 97h: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.64 Register 98h:SMSC Test Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 8.65 Register FFh: SMSC Test Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 9.1 Timing for PWM[1:3] Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 9.2 SMBus Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 10.1 24-Pin SSOP Package Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table A.1 Analog-to-Digital Voltage Conversions for Hardware Monitoring Block. . . . . . . . . . . . . . . . . . Revision 0.3 (03-01-07) 8 DATASHEET 74 74 74 75 75 75 76 76 77 78 78 79 80 81 81 81 81 82 82 82 82 83 84 84 85 86 87 88 89 SMSC EMC6D103 Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features Datasheet Chapter 1 General Description The EMC6D103 is an environmental monitoring device with automatic fan control capability. This ACPI compliant device provides hardware monitoring for up to five voltages and three thermal zones, measures the speed of up to four fans, and controls the speed of multiple DC fans using Pulse Width Modulator (PWM) outputs. High frequency and low frequency PWMs are supported. The EMC6D103 hardware monitor provides analog inputs for monitoring external voltages of +2.5V, +5V, +12V and Vccp. This device has the capability to monitor its own internal VCC power supply, which may be connected to either main power (VCC) or the suspend power well (VTR). In addition to monitoring the processor voltage, VID inputs are available to identify the voltage specification. External components are not required for voltage scaling or similar treatment. The EMC6D103 hardware monitor includes support for monitoring three thermal zones: two external and one internal. The external temperatures are measured via thermal diode inputs capable of monitoring remote devices. In addition, they are equipped with an ambient temperature sensor for measuring the internal temperature. Pulse Width Modulators (PWM) control the speed of the fans by varying the output duty cycle of the PWM. Each PWM can be associated with any or all of the thermal zones monitored. As the temperature of the associated zone varies, the PWM duty cycle is adjusted accordingly. The Ramp Rate Control feature controls the rate of change of the PWM output, thereby reducing system noise created by changing the fan speed. The speed of each fan is monitored by a Fan Tachometer input. The measured values are compared to values stored in Limit Registers to detect if a fan has stalled or seized. Fan speed may be under host software control or automatic. In host control mode, the host software continuously monitors temperature and fan speed registers, makes decisions as to desired fan speed and sets the PWM’s to drive the required fan speed. This device offers an interrupt output signal (INT#), which may be used to interrupt the host on out-of-limit temperature or voltage condition enabling an ACPI response as opposed to the host software continuously monitoring status. In auto “zone” mode, the logic continuously monitors the temperature and fan speeds and adjusts speeds without intervention from the host CPU. Fan speed is adjusted according to an algorithm using the temperature measured in the selected zone, the high and low limits set by the user, and the current fan speed. The EMC6D103 supports two Monitoring modes: Continuous Mode and Cycle Mode. In the continuous monitoring mode, the sampling and conversion process is performed continuously for each voltage and temperature reading after monitoring is enabled. The time for each voltage and temperature reading varies depending on the measurement option. In cycle monitoring mode, the part completes all sampling and conversions, then waits approximately one second to repeat the process. It repeats the sampling and conversion process typically every 1.2 seconds (1.4 sec max - default averaging enabled). The sampling and conversion of each voltage and temperature reading is performed once every monitoring cycle. (This is a power saving mode.) The EMC6D103 can be placed in one of two low-power modes: Sleep mode or Shutdown mode. These modes do not reset any of the registers of the device. In Sleep mode bias currents are on and the internal oscillator is on, but the the A/D converter and monitoring cycle are turned off. Serial bus communication is still possible with any register in the Hardware Monitor Block while in this low-power mode. In Shutdown mode the bias currents are off, the internal oscillator is off, and the the A/D converter and monitoring cycle are turned off. Serial communication is only possible with a select register. SMSC EMC6D103 9 DATASHEET Revision 0.3 (03-01-07) Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features Datasheet Chapter 2 Pinout This Environmental Monitoring and Control device (EMC) is offered in a 24 pin SSOP mechanical package. 2.1 EMC6D103 Pinout SDA 1 24 PWM1/xTest Out SCLK 2 23 Vccp VSS 3 22 2.5V VCC 4 21 12V VID0 5 20 5V VID1 6 19 VID4 VID2 7 18 Remote1+ VID3 8 17 Remote1- TACH3/INT# 9 16 Remote2+ PWM2/INT# 10 15 Remote2- TACH1 11 14 TACH4/Address Select TACH2 12 13 PWM3/Address Enable EMC6D103 Figure 2.1 EMC6D103 24 Pin SSOP Pinout Revision 0.3 (03-01-07) 10 DATASHEET SMSC EMC6D103 Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features Datasheet Chapter 3 Pin Description 3.1 Pin Functions Table 3.1 Pin Description PIN # NAME BUFFER REQUIREMENT BUFFER PER FUNCTION POWER TYPE (Note 3.1) WELL FUNCTION NOTES HARDWARE MONITORING BLOCK (24) 1 SDA 2 SCLK 5 VID0 6 VID1 7 8 IMOD3 IMOD3 VCC System Management Bus Clock. IM IM VCC Voltage ID 0 Input IM IM VCC Voltage ID 1 Input IM IM VCC VID2 Voltage ID 2 Input IM IM VCC VID3 Voltage ID 3 Input IM IM VCC 19 VID4 Voltage ID 4 Input IM IM VCC 17 Remote1- This is the negative Analog input (current sink) from the remote thermal diode. This serves as the negative input into the A/D. Digital Input. IAN IAN VCC 18 Remote1+ This is the positive input (current source) from the remote thermal diode. This serves as the positive input into the A/D. IAN IAN VCC 15 Remote2- This is the negative Analog input (current sink) from the remote thermal diode. This serves as the negative input into the A/D. Digital Input. IAN IAN VCC 16 Remote2+ This is the positive input (current source) from the remote thermal diode. This serves as the positive input into the A/D. IAN IAN VCC Analog input for +5V IAN IAN VCC Note 3.2 Analog input for +2.5V IAN IAN VCC Note 3.2 Analog input for +Vccp (processor voltage: 0 to 3.0V). IAN IAN VCC Note 3.2 Analog input for +12V IAN IAN VCC Note 3.2 20 +5V_IN 22 +2.5V_IN 23 Vccp 21 12V_IN SMSC EMC6D103 System Management Bus bi-directional Data. Open Drain output. 11 DATASHEET Revision 0.3 (03-01-07) Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features Datasheet Table 3.1 Pin Description (continued) PIN # NAME BUFFER REQUIREMENT BUFFER PER FUNCTION POWER TYPE (Note 3.1) WELL FUNCTION NOTES HARDWARE MONITORING BLOCK (24) 11 TACH1 Input for monitoring a fan tachometer input. 12 TACH2 Input for monitoring a fan tachometer input. IM IM VCC 9 TACH3 /INT# Input for monitoring a fan tachometer input. /Interrupt output to indicate a thermal and/or voltage event. IMOD3 IM /OD3 VCC 14 TACH4 /Address Select Input for monitoring a fan tachometer input. If in Address Select Mode, determines the SMBus address of the device. IM IM VCC O8 OD8/O8 VCC PWM Output 2 controlling speed of fan. /Interrupt output to indicate a thermal and/or voltage event. OD8 OD8/OD8 VCC PWM Output 3 controlling speed of fan. If pulled to ground at power on, enables Address Select Mode (Address Select pin controls SMBus address of the device). IOD8 OD8/I VCC 24 IM PWM1 PWM Output 1 controlling speed of fan. /xTest Out When in XOR tree test mode, functions as XOR Tree output. 10 PWM2 /INT# 13 PWM3 /Address Enable# 4 VCC IM VCC Positive Power Supply. Nominal 3.3V. VCC is monitored by the Hardware Monitoring Block. (Can be powered by +3.3V Standby power if monitoring in low power states is required.) 3 VSS Analog Ground. Note: The “#” as the suffix of a signal name indicates an “Active Low” signal. 3.2 Note 3.1 Buffer types per function on multiplexed pins are separated by a slash “/”. Buffer types in parenthesis represent multiple buffer types for a single pin function. Note 3.2 This analog input is backdrive protected. Buffer Type Description Note: The buffer type values are specified at VCC=3.3V Table 3.2 Buffer Type Descriptions BUFFER TYPE IM IAN IMOD3 DESCRIPTION Digital Input Analog Input, Hardware Monitoring Block. Input/Output (Open Drain), 3mA sink. O8 Output, 8mA sink, 4mA source. OD8 Output (Open Drain), 8mA sink. IO8 Input/Output, 8mA sink, 4mA source. Revision 0.3 (03-01-07) 12 DATASHEET SMSC EMC6D103 Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features Datasheet 3.3 3.3V Operation, 5V Tolerance The EMC6D103 is intended to operate with a nominal 3.3V power supply. The analog voltage pins are connected to voltage sources at their respective nominal levels. All digital signal pins are 3V switching, but are tolerant to 5V. SMSC EMC6D103 13 DATASHEET Revision 0.3 (03-01-07) Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features Datasheet Chapter 4 Operational Description 4.1 Maximum Guaranteed Ratings Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0oC to +70oC Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55o to +150oC Lead Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Refer to JEDEC Spec. J-STD-020 Maximum Vcc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.0V Positive Voltage on any pin (except for analog inputs), with respect to Ground . . . . . . . . . . . . . . 5.5V Negative Voltage on any pin (except for analog inputs), with respect to Ground. . . . . . . . . . . . . . -0.3V Positive Voltage on voltage analog inputs: Vccp_in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5V 2.5V_in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.0V +5V_in. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.0V 12V_in. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17V Note: 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. When powering this device from laboratory or system power supplies, it is important that the Absolute Maximum Ratings not be exceeded or device failure can result. Some power supplies exhibit voltage spikes on their outputs when the AC power is switched on or off. In addition, voltage transients on the AC power line may appear on the DC output. If this possibility exists, it is suggested that a clamp circuit be used. 4.2 Ratings for Operation TA = 0oC - 70oC, VCC=+3.3V±10% PARAMETER SYMBOL MIN TYP MAX UNITS COMMENTS -3 -2 ±0.25 +3 +2 o C oC oC 0oC