X40231S16I-B

DATASHEET X40231, X40233, X40235, X40237, X40239 FN8115 Rev 0.00 April 11, 2005 Integrated System Management IC Triple Voltage Monitors, POR, 2 kbit EEPROM Memory, and Single/Dual DCP FEATURES DESCRIPTION • Triple Voltage Monitors —User Programmable Threshold Voltage —Power-on Reset (POR) Circuitry —Software Selectable Reset timeout —Manual Reset Input • 2-Wire industry standard Serial Interface • 2 kbit EEPROM with Write Protect & Block LockTM • Digitally Controlled Potentiometers (DCP) The X4023x family of Integrated System Management ICs combine CPU Supervisor functions (VCC Power-onpower-on Reset (POR) circuitry, two additional programmable voltage monitor inputs with software and hardware indicators), integrated EEPROM with Block LockTM protection and one or two Intersil Digitally Controlled Potentiometers (XDCP). All functions of the X4023x are accessed by an industry standard 2-Wire serial interface. X4023X Family Selector Guide APPLICATIONS X= 256 tap 100 tap 64 Tap 1 The DCP of the X4023x may be utilized to software control analog voltages for: 1 3 1 5 1 7 1 9 1 – LCD contrast, LCD purity, or Backlight control. – Power Supply settings such as PWM frequency, Voltage Trimming or Margining (temperature offset control). – Reference voltage setting (e.g. DDR-SDRAM SSTL-2) 1 1 —Total Resistance 256 Tap = 100k100 Tap or 64 Tap = 10k —Nonvolatile wiper position —Write Protect Function • Single Supply Operation —2.7V to 5.5V • 16 Pin SOIC (300) package —SOIC The 2 kbit integrated EEPROM may be used to store ID, manufacturer data, maintenance data and module definition data. The programmable POR circuit insures VCC is stable before RESET is removed and protects against brown-outs and power failures. The programmable voltage monitors have on-chip independent reference alarm levels. With separate outputs, the voltage monitors can be used for power-on sequencing. BLOCK DIAGRAM 8 WP SDA SCL PROTECT LOGIC DATA REGISTER 4 COMMAND DECODE & CONTROL LOGIC Manual Reset (MR) WIPER COUNTER REGISTER 2 V3MON VTRIP3 V2MON VTRIP2 VCC VTRIP1 RW 256 Tap DCP RH RW Optional 64 or 100 Tap DCP 8 - BIT NONVOLATILE MEMORY V3FAIL + V2FAIL + + – RH 8 - BIT NONVOLATILE MEMORY 2 kbit EEPROM ARRAY THRESHOLD RESET LOGIC VSS CR REGISTER WIPER COUNTER REGISTER POWER-ON / LOW VOLTAGE RESET GENERATION RESET ©2000 Intersil Inc., Patents Pending (VTRIP1,2,3 are user programmable) FN8115 Rev 0.00 April 11, 2005 Page 1 of 36 X40231, X40233, X40235, X40237, X40239 PIN CONFIGURATION SINGLE XDCP X40231 X40233 X40235 16 Pin SOIC 16 Pin SOIC 16 Pin SOIC NC 16 VCC NC 2 3 15 RESET NC 14 V2FAIL 4 13 V2MON V3MON V3FAIL MR 1 NC V3MON V3FAIL MR 5 12 RW0 WP 6 SCL 11 RH0 7 NC SDA 10 8 9 VSS DUAL XDCP 16 VCC RH2 2 3 15 RESET RW2 14 V2FAIL 4 13 V2MON V3MON V3FAIL MR 1 5 WP 12 NC 6 SCL 11 RH1 7 SDA 10 RW1 8 9 VSS X40237 X40239 16 Pin SOIC 16 Pin SOIC RH2 1 16 VCC RH2 1 16 VCC RW2 2 3 15 RESET RW2 15 RESET 14 V2FAIL 14 V2FAIL 4 13 V2MON 4 13 V2MON 12 RW0 V3MON V3FAIL MR 2 3 5 NC 11 WP 12 RH0 6 SCL 11 RH1 7 SDA 10 RW1 8 9 VSS V3MON V3FAIL MR WP 5 6 SCL 7 10 NC SDA 8 9 VSS FN8115 Rev 0.00 April 11, 2005 16 VCC 2 3 15 RESET 14 V2FAIL 4 13 V2MON 5 WP 12 NC 6 11 NC SCL 7 NC SDA 10 8 9 VSS 1 Page 2 of 36 X40231, X40233, X40235, X40237, X40239 X40231 PIN ASSIGNMENT SOIC Name 1 NC No Connect Function 2 NC No Connect V3MON V3MON Voltage Monitor Input. V3MON i s the input to a non-inverting voltage comparator circuit. When the V3MON input is higher than the VTRIP3 threshold voltage, V3FAIL makes a transition to a HIGH level. Connect V3MON to VSS when not used. V3FAIL V3MON RESET Output. This open drain output makes a transition to a HIGH level when V3MON is greater than VTRIP3 and goes LOW when V3MON is less than VTRIP3. There is no delay circuitry on this pin. The V3FAIL pin requires the use of an external “pull-up” resistor. MR Manual Reset. MR is a TTL level compatible input. Pulling the MR pin active (HIGH) initiates a reset cycle to the RESET pin (VCC RESET Output pin). RESET will remain HIGH for time tPURST after MR has returned to it’s normally LOW state. The reset time can be selected using bits PUP1 and PUP0 in the CR Register. The MR pin requires the use of an external “pull-down” resistor. 6 WP Write Protect Control Pin. WP pin is a TTL level compatible input. When held HIGH, Write Protection is enabled. In the enabled state, this pin prevents all nonvolatile “write” operations. Also, when the Write Protection is enabled, and the device Block Lock feature is active (i.e. the Block Lock bits are NOT [0,0]), then no “write” (volatile or nonvolatile) operations can be performed in the device (including the wiper position of any of the integrated Digitally Controlled Potentiometers (DCPs). The WP pin uses an internal “pull-down” resistor, thus if left floating the write protection feature is disabled. 7 SCL Serial Clock. This is a TTL level compatible input pin used to control the serial bus timing for data input and output. 8 SDA Serial Data. SDA is a bidirectional TTL level compatible pin used to transfer data into and out of the device. The SDA pin input buffer is always active (not gated). This pin requires an external pull up resistor. 9 VSS Ground. 10 NC No Connect 11 RH0 Connection to end of resistor array for (the 64 Tap) DCP. 12 RW0 Connection to terminal equivalent to the “Wiper” of a mechanical potentiometer for DCP. 3 4 5 V2MON V2MON Voltage Monitor Input. V2MON is the input to a non-inverting voltage comparator circuit. When the V2MON input is greater than the VTRIP2 threshold voltage, V2FAIL makes a transition to a HIGH level. Connect V2MON to VSS when not used. V2FAIL V2MON RESET Output. This open drain output makes a transition to a HIGH level when V2MON is greater than VTRIP2, and goes LOW when V2MON is less than VTRIP2. There is no power-up reset delay circuitry on this pin. The V2FAIL pin requires the use of an external “pull-up” resistor. 15 RESET VCC RESET Output. This is an active HIGH, open drain output which becomes active whenever VCC falls below VTRIP1. RESET becomes active on power-up and remains active for a time tPURST after the power supply stabilizes (tPURST can be changed by varying the PUP0 and PUP1 bits of the internal control register). The RESET pin requires the use of an external “pull-up” resistor. The RESET pin can be forced active (HIGH) using the manual reset (MR) input pin. 16 VCC 13 14 FN8115 Rev 0.00 April 11, 2005 Supply Voltage. Page 3 of 36 X40231, X40233, X40235, X40237, X40239 X40233 PIN ASSIGNMENT SOIC Name 1 NC No Connect Function 2 NC No Connect V3MON V3MON Voltage Monitor Input. V3MON is the input to a non-inverting voltage comparator circuit. When the V3MON input is higher than the VTRIP3 threshold voltage, V3FAIL makes a transition to a HIGH level. Connect V3MON to VSS when not used. V3FAIL V3MON RESET Output. This open drain output makes a transition to a HIGH level when V3MON is greater than VTRIP3 and goes LOW when V3MON is less than VTRIP3. There is no delay circuitry on this pin. The V3FAIL pin requires the use of an external “pull-up” resistor. MR Manual Reset. MR is a TTL level compatible input. Pulling the MR pin active (HIGH) initiates a reset cycle to the RESET pin (VCC RESET Output pin). RESET will remain HIGH for time tPURST after MR has returned to it’s normally LOW state. The reset time can be selected using bits PUP1 and PUP0 in the CR Register. The MR pin requires the use of an external “pull-down” resistor. 6 WP Write Protect Control Pin. WP pin is a TTL level compatible input. When held HIGH, Write Protection is enabled. In the enabled state, this pin prevents all nonvolatile “write” operations. Also, when the Write Protection is enabled, and the device Block Lock feature is active (i.e. the Block Lock bits are NOT [0,0]), then no “write” (volatile or nonvolatile) operations can be performed in the device (including the wiper position of any of the integrated Digitally Controlled Potentiometers (DCPs). The WP pin uses an internal “pull-down” resistor, thus if left floating the write protection feature is disabled. 7 SCL Serial Clock. This is a TTL level compatible input pin used to control the serial bus timing for data input and output. 8 SDA Serial Data. SDA is a bidirectional TTL level compatible pin used to transfer data into and out of the device. The SDA pin input buffer is always active (not gated). This pin requires an external pull up resistor. 9 VSS Ground. 10 RW1 Connection to terminal equivalent to the “Wiper” of a mechanical potentiometer for DCP. 11 RH1 Connection to end of resistor array for (the 100 Tap) DCP. 12 NC No Connect 3 4 5 V2MON V2MON Voltage Monitor Input. V2MON is the input to a non-inverting voltage comparator circuit. When the V2MON input is greater than the VTRIP2 threshold voltage, V2FAIL makes a transition to a HIGH level. Connect V2MON to VSS when not used. V2FAIL V2MON RESET Output. This open drain output makes a transition to a HIGH level when V2MON is greater than VTRIP2, and goes LOW when V2MON is less than VTRIP2. There is no power-up reset delay circuitry on this pin. The V2FAIL pin requires the use of an external “pull-up” resistor. 15 RESET VCC RESET Output. This is an active HIGH, open drain output which becomes active whenever VCC falls below VTRIP1. RESET becomes active on power-up and remains active for a time tPURST after the power supply stabilizes (tPURST can be changed by varying the PUP0 and PUP1 bits of the internal control register). The RESET pin requires the use of an external “pull-up” resistor. The RESET pin can be forced active (HIGH) using the manual reset (MR) input pin. 16 VCC 13 14 FN8115 Rev 0.00 April 11, 2005 Supply Voltage. Page 4 of 36 X40231, X40233, X40235, X40237, X40239 X40235 PIN ASSIGNMENT SOIC Name 1 RH2 Function Connection to end of resistor array for (the 256 Tap) DCP. 2 RW2 Connection to terminal equivalent to the “Wiper” of a mechanical potentiometer for DCP. V3MON V3MON Voltage Monitor Input. V3MON is the input to a non-inverting voltage comparator circuit. When the V3MON input is higher than the VTRIP3 threshold voltage, V3FAIL makes a transition to a HIGH level. Connect V3MON to VSS when not used. V3FAIL V3MON RESET Output. This open drain output makes a transition to a HIGH level when V3MON is greater than VTRIP3 and goes LOW when V3MON is less than VTRIP3. There is no delay circuitry on this pin. The V3FAIL pin requires the use of an external “pull-up” resistor. MR Manual Reset. MR is a TTL level compatible input. Pulling the MR pin active (HIGH) initiates a reset cycle to the RESET pin (VCC RESET Output pin). RESET will remain HIGH for time tPURST after MR has returned to it’s normally LOW state. The reset time can be selected using bits PUP1 and PUP0 in the CR Register. The MR pin requires the use of an external “pull-down” resistor. 6 WP Write Protect Control Pin. WP pin is a TTL level compatible input. When held HIGH, Write Protection is enabled. In the enabled state, this pin prevents all nonvolatile “write” operations. Also, when the Write Protection is enabled, and the device Block Lock feature is active (i.e. the Block Lock bits are NOT [0,0]), then no “write” (volatile or nonvolatile) operations can be performed in the device (including the wiper position of any of the integrated Digitally Controlled Potentiometers (DCPs). The WP pin uses an internal “pull-down” resistor, thus if left floating the write protection feature is disabled. 7 SCL Serial Clock. This is a TTL level compatible input pin used to control the serial bus timing for data input and output. 8 SDA Serial Data. SDA is a bidirectional TTL level compatible pin used to transfer data into and out of the device. The SDA pin input buffer is always active (not gated). This pin requires an external pull up resistor. 9 VSS Ground. 10 NC No Connect 11 NC No Connect 12 NC No Connect 3 4 5 V2MON V2MON Voltage Monitor Input. V2MON is the input to a non-inverting voltage comparator circuit. When the V2MON input is greater than the VTRIP2 threshold voltage, V2FAIL makes a transition to a HIGH level. Connect V2MON to VSS when not used. V2FAIL V2MON RESET Output. This open drain output makes a transition to a HIGH level when V2MON is greater than VTRIP2, and goes LOW when V2MON is less than VTRIP2. There is no power-uppower-up reset delay circuitry on this pin. The V2FAIL pin requires the use of an external “pull-up” resistor. 15 RESET VCC RESET Output. This is an active HIGH, open drain output which becomes active whenever VCC falls below VTRIP1. RESET becomes active on power-up and remains active for a time tPURST after the power supply stabilizes (tPURST can be changed by varying the PUP0 and PUP1 bits of the internal control register). The RESET pin requires the use of an external “pull-up” resistor. The RESET pin can be forced active (HIGH) using the manual reset (MR) input pin. 16 VCC 13 14 FN8115 Rev 0.00 April 11, 2005 Supply Voltage. Page 5 of 36 X40231, X40233, X40235, X40237, X40239 X40237 PIN ASSIGNMENT SOIC Name 1 RH2 Function Connection to end of resistor array for (the 256 Tap) DCP2. 2 RW2 Connection to terminal equivalent to the “Wiper” of a mechanical potentiometer for DCP2. V3MON V3MON Voltage Monitor Input. V3MON is the input to a non-inverting voltage comparator circuit. When the V3MON input is higher than the VTRIP3 threshold voltage, V3FAIL makes a transition to a HIGH level. Connect V3MON to VSS when not used. V3FAIL V3MON RESET Output. This open drain output makes a transition to a HIGH level when V3MON is greater than VTRIP3 and goes LOW when V3MON is less than VTRIP3. There is no delay circuitry on this pin. The V3FAIL pin requires the use of an external “pull-up” resistor. MR Manual Reset. MR is a TTL level compatible input. Pulling the MR pin active (HIGH) initiates a reset cycle to the RESET pin (VCC RESET Output pin). RESET will remain HIGH for time tPURST after MR has returned to it’s normally LOW state. The reset time can be selected using bits PUP1 and PUP0 in the CR Register. The MR pin requires the use of an external “pull-down” resistor. 6 WP Write Protect Control Pin. WP pin is a TTL level compatible input. When held HIGH, Write Protection is enabled. In the enabled state, this pin prevents all nonvolatile “write” operations. Also, when the Write Protection is enabled, and the device Block Lock feature is active (i.e. the Block Lock bits are NOT [0,0]), then no “write” (volatile or nonvolatile) operations can be performed in the device (including the wiper position of any of the integrated Digitally Controlled Potentiometers (DCPs). The WP pin uses an internal “pull-down” resistor, thus if left floating the write protection feature is disabled. 7 SCL Serial Clock. This is a TTL level compatible input pin used to control the serial bus timing for data input and output. 8 SDA Serial Data. SDA is a bidirectional TTL level compatible pin used to transfer data into and out of the device. The SDA pin input buffer is always active (not gated). This pin requires an external pull up resistor. 9 VSS Ground. 10 NC No Connect 11 RH0 Connection to end of resistor array for (the 64 Tap) DCP0. 12 RW0 Connection to terminal equivalent to the “Wiper” of a mechanical potentiometer for DCP0. 3 4 5 V2MON V2MON Voltage Monitor Input. V2MON is the input to a non-inverting voltage comparator circuit. When the V2MON input is greater than the VTRIP2 threshold voltage, V2FAIL makes a transition to a HIGH level. Connect V2MON to VSS when not used. V2FAIL V2MON RESET Output. This open drain output makes a transition to a HIGH level when V2MON is greater than VTRIP2, and goes LOW when V2MON is less than VTRIP2. There is no power-uppower-up reset delay circuitry on this pin. The V2FAIL pin requires the use of an external “pull-up” resistor. 15 RESET VCC RESET Output. This is an active HIGH, open drain output which becomes active whenever VCC falls below VTRIP1. RESET becomes active on power-up and remains active for a time tPURST after the power supply stabilizes (tPURST can be changed by varying the PUP0 and PUP1 bits of the internal control register). The RESET pin requires the use of an external “pull-up” resistor. The RESET pin can be forced active (HIGH) using the manual reset (MR) input pin. 16 VCC 13 14 FN8115 Rev 0.00 April 11, 2005 Supply Voltage. Page 6 of 36 X40231, X40233, X40235, X40237, X40239 X40239 PIN ASSIGNMENT SOIC Name 1 RH2 Function Connection to end of resistor array for (the 256 Tap) DCP2. 2 RW2 Connection to terminal equivalent to the “Wiper” of a mechanical potentiometer for DCP2. V3MON V3MON Voltage Monitor Input. V3MON is the input to a non-inverting voltage comparator circuit. When the V3MON input is higher than the VTRIP3 threshold voltage, V3FAIL makes a transition to a HIGH level. Connect V3MON to VSS when not used. V3FAIL V3MON RESET Output. This open drain output makes a transition to a HIGH level when V3MON is greater than VTRIP3 and goes LOW when V3MON is less than VTRIP3. There is no delay circuitry on this pin. The V3FAIL pin requires the use of an external “pull-up” resistor. MR Manual Reset. MR is a TTL level compatible input. Pulling the MR pin active (HIGH) initiates a reset cycle to the RESET pin (VCC RESET Output pin). RESET will remain HIGH for time tPURST after MR has returned to it’s normally LOW state. The reset time can be selected using bits PUP1 and PUP0 in the CR Register. The MR pin requires the use of an external “pull-down” resistor. 6 WP Write Protect Control Pin. WP pin is a TTL level compatible input. When held HIGH, Write Protection is enabled. In the enabled state, this pin prevents all nonvolatile “write” operations. Also, when the Write Protection is enabled, and the device Block Lock feature is active (i.e. the Block Lock bits are NOT [0,0]), then no “write” (volatile or nonvolatile) operations can be performed in the device (including the wiper position of any of the integrated Digitally Controlled Potentiometers (DCPs). The WP pin uses an internal “pull-down” resistor, thus if left floating the write protection feature is disabled. 7 SCL Serial Clock. This is a TTL level compatible input pin used to control the serial bus timing for data input and output. 8 SDA Serial Data. SDA is a bidirectional TTL level compatible pin used to transfer data into and out of the device. The SDA pin input buffer is always active (not gated). This pin requires an external pull up resistor. 9 VSS Ground. 10 RW1 Connection to terminal equivalent to the “Wiper” of a mechanical potentiometer for DCP1. 11 RH1 Connection to end of resistor array for (the 100 Tap) DCP1. 12 NC No Connect 3 4 5 V2MON V2MON Voltage Monitor Input. V2MON is the input to a non-inverting voltage comparator circuit. When the V2MON input is greater than the VTRIP2 threshold voltage, V2FAIL makes a transition to a HIGH level. Connect V2MON to VSS when not used. V2FAIL V2MON RESET Output. This open drain output makes a transition to a HIGH level when V2MON is greater than VTRIP2, and goes LOW when V2MON is less than VTRIP2. There is no power-up reset delay circuitry on this pin. The V2FAIL pin requires the use of an external “pull-up” resistor. 15 RESET VCC RESET Output. This is an active HIGH, open drain output which becomes active whenever VCC falls below VTRIP1. RESET becomes active on power-up and remains active for a time tPURST after the power supply stabilizes (tPURST can be changed by varying the PUP0 and PUP1 bits of the internal control register). The RESET pin requires the use of an external “pull-up” resistor. The RESET pin can be forced active (HIGH) using the manual reset (MR) input pin. 16 VCC 13 14 FN8115 Rev 0.00 April 11, 2005 Supply Voltage. Page 7 of 36 X40231, X40233, X40235, X40237, X40239 SCL SDA Data Stable Figure 1. Data Stable Valid Data Changes on the SDA Bus DETAILED DEVICE DESCRIPTION The X4023x combines One or Two Intersil Digitally Controlled Potentiometer (XDCP) devices, VCC power-on reset control, VCC low voltage reset control, two supplementary voltage monitors with independent outputs, and integrated EEPROM with Block Lock™ protection, in one package. The integrated functionality of the X4023x lowers system cost, increases reliability, and reduces board space requirements. DCPs allow for the “set-and-forget” adjustment during production test or in-system updating via the industry standard 2-wire interface. Applying voltage to VCC activates the Power-on Reset circuit which sets the RESET output HIGH, until the supply voltage stabilizes for a period of time (50-300 msec selectable via software). The RESET output then goes LOW. The Low Voltage Reset circuit sets the RESET output HIGH when VCC falls below the minimum VCC trip point. RESET remains HIGH until VCC returns to proper operating level and stabilizes for a period of time (tPURST). A Manual Reset (MR) input allows the user to externally activate the RESET output. Two supplementary Voltage Monitor circuits, V2MON and V3MON, continuously compare their inputs to individual trip voltages (independent on-chip voltage references factory set and user programmable). When an input voltage exceeds it’s associated trip level, the corresponding output (V3FAIL, V2FAIL) goes HIGH. When the input voltage becomes lower than it’s associated trip level, the corresponding output is driven LOW. A corresponding binary representation of the two monitor circuit outputs (V2FAIL and V3FAIL) are also stored in latched, volatile (CR) register bits. The status of these two monitor outputs can be read out via the 2-wire serial port. The bits will remain SET, even after the alarm condition is removed, allowing advanced recovery algorithms to be implemented. FN8115 Rev 0.00 April 11, 2005 Data Change Intersil’s unique circuits allow for all internal trip voltages to be individually programmed with high accuracy, either by Intersil at final test or by the user during their production process. Some distributors offer VTRIP reprogramming as a value added service. This gives the designer great flexibility in changing system parameters, either at the time of manufacture, or in the field. The memory portion of the device is a CMOS serial EEPROM array with Intersil’s Block LockTM protection. This memory may be used to store module manufacturing data, serial numbers, or various other system parameters. The EEPROM array is internally organized as x 8, and utilizes Intersil’s proprietary Direct WriteTM cells providing a minimum endurance of 1,000,000 cycles and a minimum data retention of 100 years. The device features a 2-Wire interface. PRINCIPLES OF OPERATION SERIAL INTERFACE Serial Interface Conventions The device supports a bidirectional bus oriented protocol. The protocol defines any device that sends data onto the bus as a transmitter, and the receiving device as the receiver. The device controlling the transfer is called the master and the device being controlled is called the slave. The master always initiates data transfers, and provides the clock for both transmit and receive operations. The X4023x operates as a slave in all applications. Serial Clock and Data Data states on the SDA line can change only while SCL is LOW (see Figure 1). SDA state changes while SCL is HIGH are reserved for indicating START and STOP conditions. See Figure 1. On power-up of the X4023x, the SDA pin is in the input mode. Page 8 of 36 X40231, X40233, X40235, X40237, X40239 SCL SDA Start Figure 2. Stop Valid Start and Stop Conditions Serial Start Condition All commands are preceded by the START condition, which is a HIGH to LOW transition of SDA while SCL is HIGH. The device continuously monitors the SDA and SCL lines for the START condition and does not respond to any command until this condition has been met. See Figure 2. Serial Stop Condition All communications must be terminated by a STOP condition, which is a LOW to HIGH transition of SDA while SCL is HIGH. The STOP condition is also used to place the device into the Standby power mode after a read sequence. A STOP condition can only be issued after the transmitting device has released the bus. See Figure 2. The device will respond with an ACKNOWLEDGE after recognition of a START condition if the correct Device Identifier bits are contained in the Slave Address Byte. If a write operation is selected, the device will respond with an ACKNOWLEDGE after the receipt of each subsequent eight bit word. In the read mode, the device will transmit eight bits of data, release the SDA line, then monitor the line for an ACKNOWLEDGE. If an ACKNOWLEDGE is detected and no STOP condition is generated by the master, the device will continue to transmit data. The device will terminate further data transmissions if an ACKNOWLEDGE is not detected. The master must then issue a STOP condition to place the device into a known state. DEVICE INTERNAL ADDRESSING Serial Acknowledge Addressing Protocol Overview An ACKNOWLEDGE (ACK) is a software convention used to indicate a successful data transfer. The transmitting device, either master or slave, will release the bus after transmitting eight bits. During the ninth clock cycle, the receiver will pull the SDA line LOW to ACKNOWLEDGE that it received the eight bits of data. Refer to Figure 3 The user addressable internal components of the X4023x can be split up into three main parts: SCL from Master 1 —One or Two Digitally Controlled Potentiometers (DCPs) —EEPROM array —Control and Status (CR) Register 8 9 Data Output from Transmitter Data Output from Receiver Start Figure 3. FN8115 Rev 0.00 April 11, 2005 Acknowledge Acknowledge Response From Receiver Page 9 of 36 X40231, X40233, X40235, X40237, X40239 Depending upon the operation to be performed on each of these individual parts, a 1, 2 or 3 Byte protocol is used. All operations however must begin with the Slave Address Byte being issued on the SDA pin. The Slave address selects the part of the X4023x to be addressed, and specifies if a Read or Write operation is to be performed. It should be noted that in order to perform a write operation to either a DCP or the EEPROM array, the Write Enable Latch (WEL) bit must first be set (See “BL1, BL0: Block Lock protection bits - (Nonvolatile)” on page 18.) Slave Address Byte Following a START condition, the master must output a Slave Address Byte (Refer to Figure 4). This byte consists of three parts: —The Device Type Identifier which consists of the most significant four bits of the Slave Address (SA7 - SA4). The Device Type Identifier must always be set to 1010 in order to select the X4023x. —The next three bits (SA3 - SA1) are the Internal Device Address bits. Setting these bits to 000 internally selects the EEPROM array, while setting these bits to 111 selects the DCP structures in the X4023x. The CR Register may be selected using the Internal Device Address 010. SA7 SA6 SA5 SA4 1 0 1 DEVICE TYPE IDENTIFIER SA3 SA2 SA1 0 SA0 R/W INTERNAL DEVICE ADDRESS READ / WRITE Internal Address (SA3 - SA1) Internally Addressed Device 000 EEPROM Array 010 CR Register 111 DCP Bit SA0 Operation 0 WRITE 1 READ Figure 4. Slave Address Format —The Least Significant Bit of the Slave Address (SA0) Byte is the R/W bit. This bit defines the operation to be performed on the device being addressed (as defined in the bits SA3 - SA1). When the R/W bit is “1”, then a READ operation is selected. A “0” selects a WRITE operation (Refer to Figure 4) To perform acknowledge polling, the master issues a START condition followed by a Slave Address Byte. The Slave Address issued must contain a valid Internal Device Address. The LSB of the Slave Address (R/W) can be set to either 1 or 0 in this case. If the device is still busy with the high voltage cycle then no ACKNOWLEDGE will be returned. If the device has completed the write operation, an ACKNOWLEDGE will be returned and the host can then proceed with a read or write operation. (Refer to Figure 5) Nonvolatile Write Acknowledge Polling DIGITALLY CONTROLLED POTENTIOMETERS After a nonvolatile write command sequence (for either the EEPROM array, the Non Volatile Memory of a DCP (NVM), or the CR Register) has been correctly issued (including the final STOP condition), the X4023x initiates an internal high voltage write cycle. This cycle typically requires 5 ms. During this time, no further Read or Write commands can be issued to the device. Write Acknowledge Polling is used to determine when this high voltage write cycle has been completed. FN8115 Rev 0.00 April 11, 2005 DCP Functionality The X4023x includes one or two independent resistor arrays. For the 64, 100 or 256 tap XDCPs, these arrays respectively contain 63, 99 discrete resistive segments that are connected in series. (the 256 tap resistor achieves an equivalent end to end resistance.) The physical ends of each array are equivalent to the fixed terminals of a mechanical potentiometer. At one end of the resistor array the terminal connects to the RHx pin (x = 0,1,2).The other end of the resistor array is connected to VSS inside the package. Page 10 of 36 X40231, X40233, X40235, X40237, X40239 At both ends of each array and between each resistor segment there is a CMOS switch connected between the resistor array and the wiper (Rwx) output. Within each individual array, only one switch may be turned on at any one time. These switches are controlled by the Wiper Counter Register (WCR) (See Figure 6). The WCR is a volatile register. Byte load completed by issuing STOP. Enter ACK Polling Issue START Issue Slave Address Byte (Read or Write) On power-up of the X4023x, wiper position data is automatically loaded into the WCR from its associated Non Volatile Memory (NVM) Register. The Table below shows the Initial Values of the DCP WCR’s before the contents of the NVM is loaded into the WCR. Issue STOP NO ACK returned? YES High Voltage Cycle NO complete. Continue Issue STOP YES Continue normal Read or Write command sequence RHx N WIPER COUNTER REGISTER (WCR) “WIPER” FET SWITCHES RESISTOR ARRAY 2 VL (TAP = 0) R2 (256 TAP) VH (TAP = 255) DCP Internal Structure The device is designed such that the wiper terminal (RWx) is recalled to the correct position (as per the last stored in the DCP NVM), when the voltage applied to VCC exceeds VTRIP1 for a time exceeding tPURST (the Power-on Reset time, set in the CR Register - See “CONTROL AND STATUS REGISTER” on page 18.). DCP Operations 1 In total there are three operations that can be performed on any internal DCP structure: RWx FN8115 Rev 0.00 April 11, 2005 R1 (100 TAP) Therefore, if ttrans is defined as the time taken for VCC to settle above VTRIP1 (Figure 7): then the desired wiper terminal position is recalled by (a maximum) time: ttrans + tPURST. It should be noted that ttrans is determined by system hot plug conditions. 0 Figure 6. VH (TAP = 63) Figure 7 shows a typical waveform that the X4023x might experience in a Hot Pluggable situation. On power-up, VCC applied to the X4023x may exhibit some amount of ringing, before it settles to the required value. Acknowledge Polling Sequence NON VOLATILE MEMORY (NVM) R0 (64 TAP) Hot Pluggability PROCEED DECODER Initial Values Before Recall The data in the WCR is then decoded to select and enable one of the respective FET switches. A “make before break” sequence is used internally for the FET switches when the wiper is moved from one tap position to another. command sequence? Figure 5. DCP —DCP Nonvolatile Write —DCP Volatile Write —DCP Read Page 11 of 36 X40231, X40233, X40235, X40237, X40239 VCC VCC (Max.) VTRIP1 tTRANS tPURST t 0 Maximum Wiper Recall time Figure 7. DCP Power-up A nonvolatile write to a DCP will change the “wiper position” by simultaneously writing new data to the associated WCR and NVM. Therefore, the new “wiper position” setting is recalled into the WCR after VCC of the X4023x is powered down and then powered back up. A volatile write operation to a DCP however, changes the “wiper position” by writing new data to the associated WCR only. The contents of the associated NVM register remains unchanged. Therefore, when VCC to the device is powered down then back up, the “wiper position” reverts to that last position written to the DCP using a nonvolatile write operation. Both volatile and nonvolatile write operations are executed using a three byte command sequence: (DCP) Slave Address Byte, Instruction Byte, followed by a Data Byte (See Figure 9) A DCP Read operation allows the user to “read out” the current “wiper position” of the DCP, as stored in the associated WCR. This operation is executed using the Random Address Read command sequence, consisting of the (DCP) Slave Address Byte followed by an Instruction Byte and the Slave Address Byte again (Refer to Figure 10). Instruction Byte While the Slave Address Byte is used to select the DCP devices, an Instruction Byte is used to determine which DCP is being addressed. The Instruction Byte (Figure 8) is valid only when the Device Type Identifier and the Internal Device Address bits of the Slave Address are set to 1010111. In this case, the two Least Significant Bit’s (I1 - I0) of the Instruction Byte are used to select the particular DCP (0 - 2). In the case of a Write to any of the DCPs (i.e. the FN8115 Rev 0.00 April 11, 2005 I7 WT I6 I5 I4 I3 I2 0 0 0 0 0 WRITE TYPE I1 P1 I0 P0 DCP SELECT WT† Description 0 Select a Volatile Write operation to be performed on the DCP pointed to by bits P1 and P0 1 Select a Nonvolatile Write operation to be performed on the DCP pointed to by bits P1 and P0 †This bit has no effect when a Read operation is being performed. Figure 8. Instruction Byte Format LSB of the Slave Address is 0), the Most Significant Bit of the Instruction Byte (I7), determines the Write Type (WT) performed. If WT is “1”, then a Nonvolatile Write to the DCP occurs. In this case, the “wiper position” of the DCP is changed by simultaneously writing new data to the associated WCR and NVM. Therefore, the new “wiper position” setting is recalled into the WCR after VCC of the X4023x has been powered down then powered back up. If WT is “0” then a DCP Volatile Write is performed. This operation changes the DCP “wiper position” by writing new data to the associated WCR only. The contents of the associated NVM register remains unchanged. Therefore, when VCC to the device is powered down then back up, the “wiper position” reverts to that last written to the DCP using a nonvolatile write operation. Page 12 of 36 X40231, X40233, X40235, X40237, X40239 S 1 T A R T 0 1 0 1 1 1 0 A WT C K 0 0 0 0 P1 P0 A C K D7 D6 D5 D4 D3 D2 D1 D0 INSTRUCTION BYTE SLAVE ADDRESS BYTE Figure 9. DATA BYTE A C K S T O P DCP Write Command Sequence DCP Write Operation A write to DCPx (x=0,1,2) can be performed using the three byte command sequence shown in Figure 9. In order to perform a write operation on a particular DCP, the Write Enable Latch (WEL) bit of the CR Register must first be set (See “BL1, BL0: Block Lock protection bits - (Nonvolatile)” on page 18.) The Slave Address Byte 10101110 specifies that a Write to a DCP is to be conducted. An ACKNOWLEDGE is returned by the X4023x after the Slave Address, if it has been received correctly. Next, an Instruction Byte is issued on SDA. Bits P1 and P0 of the Instruction Byte determine which WCR is to be written, while the WT bit determines if the Write is to be volatile or nonvolatile. If the Instruction Byte format is valid, another ACKNOWLEDGE is then returned by the X4023x. Following the Instruction Byte, a Data Byte is issued to the X4023x over SDA. The Data Byte contents is latched into the WCR of the DCP on the first rising edge of the clock signal, after the LSB of the Data Byte (D0) has been issued on SDA (See Figure 34). The Data Byte determines the “wiper position” (which FET switch of the DCP resistive array is switched ON) of the DCP. The maximum value for the Data Byte depends upon which DCP is being addressed (see following table). P1- P0 DCPx # Taps Max. Data Byte 0 0 x=0 64 3Fh 0 1 x=1 100 Refer to Appendix 1 1 0 x=2 256 FFh 1 1 FN8115 Rev 0.00 April 11, 2005 0 Using a Data Byte larger than the values specified above results in the “wiper terminal” being set to the highest tap position. The “wiper position” does NOT rollover to the lowest tap position. For DCP0 (64 Tap) and DCP2 (256 Tap), the Data Byte maps one to one to the “wiper position” of the DCP “wiper terminal”. Therefore, the Data Byte 00001111 (1510) corresponds to setting the “wiper terminal” to tap position 15. Similarly, the Data Byte 00011100 (2810) corresponds to setting the “wiper terminal” to tap position 28. The mapping of the Data Byte to “wiper position” data for DCP1 (100 Tap), is shown in “APPENDIX 1” . An example of a simple C language function which “translates” between the tap position (decimal) and the Data Byte (binary) for DCP1, is given in “APPENDIX 2” . It should be noted that all writes to any DCP of the X4023x are random in nature. Therefore, the Data Byte of consecutive write operations to any DCP can differ by an arbitrary number of bits. Also, setting the bits P1 = 1, P0 = 1 is a reserved sequence, and will result in no ACKNOWLEDGE after sending an Instruction Byte on SDA. The factory default setting of all “wiper position” settings is with 00h stored in the NVM of the DCPs. This corresponds to having the “wiper terminal” RWX (x = 0,1,2) at the “lowest” tap position, Therefore, the resistance between RWX and RLX is a minimum (essentially only the Wiper Resistance, RW). Reserved Page 13 of 36 X40231, X40233, X40235, X40237, X40239 WRITE Operation S t a r t Signals from the Master SDA Bus READ Operation Slave Address Instruction Byte 1 0 1 0 1 1 1 0 W0 0 0 0 0 P P 1 0 T A C K Signals from the Slave S t a r t Slave Address Data Byte S t o p 1 0 1 0 1 1 1 1 A C K A C K DCPx “Dummy” write -- x=0 - x=1 x=2 MSB Figure 10. A read of DCPx (x = 0,1,2) can be performed using the three byte random read command sequence shown in Figure 10. The master issues the START condition and the Slave Address Byte 10101110 which specifies that a “dummy” write” is to be conducted. This “dummy” write operation sets which DCP is to be read (in the preceding Read operation). An ACKNOWLEDGE is returned by the X4023x after the Slave Address if received correctly. Next, an Instruction Byte is issued on SDA. Bits P1-P0 of the Instruction Byte determine which DCP “wiper position” is to be read. In this case, the state of the WT bit is “don’t care”. If the Instruction Byte format is valid, then another ACKNOWLEDGE is returned by the X4023x. Following this ACKNOWLEDGE, the master immediately issues another START condition and a valid Slave address byte with the R/W bit set to 1. Then the X4023x issues an ACKNOWLEDGE followed by Data Byte, and finally, the master issues a STOP condition. The Data Signals from the Master SDA Bus Signals from the Slave S t a r t “-” = DON’T CARE DCP Read Sequence DCP Read Operation LSB Byte read in this operation, corresponds to the “wiper position” (value of the WCR) of the DCP pointed to by bits P1 and P0. It should be noted that when reading out the data byte for DCP0 (64 Tap), the upper two most significant bits are “unknown” bits. For DCP1 (100 Tap), the upper most significant bit is an “unknown”. For DCP2 (256 Tap) however, all bits of the data byte are relevant (See Figure 10). 2 kbit EEPROM ARRAY Operations on the 2 kbit EEPROM Array, consist of either 1, 2 or 3 byte command sequences. All operations on the EEPROM must begin with the Device Type Identifier of the Slave Address set to 1010000. A Read or Write to the EEPROM is selected by setting the LSB of the Slave Address to the appropriate value R/W (Read = “1”, Write = ”0”). In some cases when performing a Read or Write to the EEPROM, an Address Byte may also need to be specified. This Address Byte can contain the values 00h to FFh. WRITE Operation Address Byte Slave Address S t o p Data Byte 1 01 0 0 00 0 Internal Device Address A C K A C K A C K Figure 11. EEPROM Byte Write Sequence FN8115 Rev 0.00 April 11, 2005 Page 14 of 36 X40231, X40233, X40235, X40237, X40239 Signals from the Master SDA Bus Signals from the Slave S t a r t (2 < n < 16) Address Byte Slave Address S t o p Data (n) Data (1) 1 01 0 0 00 0 A C K A C K A C K A C K Figure 12. EEPROM Page Write Operation EEPROM Byte Write In order to perform an EEPROM Byte Write operation to the EEPROM array, the Write Enable Latch (WEL) bit of the CR Register must first be set (See “BL1, BL0: Block Lock protection bits - (Nonvolatile)” on page 18.) For a write operation, the X4023x requires the Slave Address Byte and an Address Byte. This gives the master access to any one of the words in the array. After receipt of the Address Byte, the X4023x responds with an ACKNOWLEDGE, and awaits the next eight bits of data. After receiving the 8 bits of the Data Byte, it again responds with an ACKNOWLEDGE. The master then terminates the transfer by generating a STOP condition, at which time the X4023x begins the internal write cycle to the nonvolatile memory (See Figure 11). During this internal write cycle, the X4023x inputs are disabled, so it does not respond to any requests from the master. The SDA output is at high impedance. A write to a region of EEPROM memory which has been protected with the Block-Lock feature (See “BL1, BL0: Block Lock protection bits - (Nonvolatile)” on page 18.), suppresses the ACKNOWLEDGE bit after the Address Byte. EEPROM Page Write In order to perform an EEPROM Page Write operation to the EEPROM array, the Write Enable Latch (WEL) bit of the CR Register must first be set (See “BL1, BL0: Block Lock protection bits - (Nonvolatile)” on page 18.) The X4023x is capable of a page write operation. It is initiated in the same manner as the byte write operation; but instead of terminating the write cycle after the first data byte is transferred, the master can transmit an unlimited number of 8-bit bytes. After the receipt of each byte, the X4023x responds with an ACKNOWLEDGE, and the address is internally incremented by one. The page address remains constant. When the counter reaches the end of the page, it “rolls over” and goes back to ‘0’ on the same page. FN8115 Rev 0.00 April 11, 2005 For example, if the master writes 12 bytes to the page starting at location 11 (decimal), the first 5 bytes are written to locations 11 through 15, while the last 7 bytes are written to locations 0 through 6. Afterwards, the address counter would point to location 7. If the master supplies more than 16 bytes of data, then new data overwrites the previous data, one byte at a time (See Figure 13). The master terminates the Data Byte loading by issuing a STOP condition, which causes the X4023x to begin the nonvolatile write cycle. As with the byte write operation, all inputs are disabled until completion of the internal write cycle. See Figure 12 for the address, ACKNOWLEDGE, and data transfer sequence. Stops and EEPROM Write Modes Stop conditions that terminate write operations must be sent by the master after sending at least 1 full data byte and receiving the subsequent ACKNOWLEDGE signal. If the master issues a STOP within a Data Byte, or before the X4023x issues a corresponding ACKNOWLEDGE, the X4023x cancels the write operation. Therefore, the contents of the EEPROM array does not change. EEPROM Array Read Operations Read operations are initiated in the same manner as write operations with the exception that the R/W bit of the Slave Address Byte is set to one. There are three basic read operations: Current EEPROM Address Read, Random EEPROM Read, and Sequential EEPROM Read. Current EEPROM Address Read Internally the device contains an address counter that maintains the address of the last word read incremented by one. Therefore, if the last read was to address n, the next read operation would access data from address Page 15 of 36 X40231, X40233, X40235, X40237, X40239 5 bytes 5 bytes 7 bytes address 1110 address = 610 address 15 10 address pointer ends here Addr = 710 Figure 13. Example: Writing 12 bytes to a 16-byte page starting at location 11. Signals from the Master SDA Bus S t a r t S t o p Slave Address 1 0 1 0 0 0 0 1 Signals from the Slave A C K Data Figure 14. Current EEPROM Address Read Sequence n+1. On power-up, the address of the address counter is undefined, requiring a read or write operation for initialization. Upon receipt of the Slave Address Byte with the R/W bit set to one, the device issues an ACKNOWLEDGE and then transmits the eight bits of the Data Byte. The master terminates the read operation when it does not respond with an ACKNOWLEDGE during the ninth clock and then issues a STOP condition (See Figure 14 for the address, ACKNOWLEDGE, and data transfer sequence). It should be noted that the ninth clock cycle of the read operation is not a “don’t care.” To terminate a read operation, the master must either issue a STOP condition during the ninth cycle or hold SDA HIGH during the ninth clock cycle and then issue a STOP condition. Another important point to note regarding the “Current EEPROM Address Read” , is that this operation is not available if the last executed operation was an access to a DCP or the CR Register (i.e.: an operation using the Device Type Identifier 1010111 or 1010010). Immediately after an operation to a DCP or CR Register is performed, only a “Random EEPROM Read” is available. Immediately following a “Random EEPROM Read” , a FN8115 Rev 0.00 April 11, 2005 “Current EEPROM Address Read” or “Sequential EEPROM Read” is once again available (assuming that no access to a DCP or CR Register occur in the interim). Random EEPROM Read Random read operation allows the master to access any memory location in the array. Prior to issuing the Slave Address Byte with the R/W bit set to one, the master must first perform a “dummy” write operation. The master issues the START condition and the Slave Address Byte, receives an ACKNOWLEDGE, then issues an Address Byte. This “dummy” Write operation sets the address pointer to the address from which to begin the random EEPROM read operation. After the X4023x acknowledges the receipt of the Address Byte, the master immediately issues another START condition and the Slave Address Byte with the R/W bit set to one. This is followed by an ACKNOWLEDGE from the X4023x and then by the eight bit word. Page 16 of 36 X40231, X40233, X40235, X40237, X40239 READ Operation WRITE Operation Signals from the Master SDA Bus S t a r t Slave Address 10 1 0 0 0 0 S t o p Slave Address 1010000 0 A C K A C K Signals from the Slave S t a r t Address Byte 1 A C K Data “Dummy” Write Figure 15. Random EEPROM Address Read Sequence The master terminates the read operation by not responding with an ACKNOWLEDGE and instead issuing a STOP condition (Refer to Figure 15). A similar operation called “Set Current Address” also exists. This operation is performed if a STOP is issued instead of the second START shown in Figure 15. In this case, the device sets the address pointer to that of the Address Byte, and then goes into standby mode after the STOP bit. All bus activity will be ignored until another START is detected. Sequential EEPROM Read Sequential reads can be initiated as either a current address read or random address read. The first Data Byte is transmitted as with the other modes; however, Signals from the Master SDA Bus Signals from the Slave Slave Address the master now responds with an ACKNOWLEDGE, indicating it requires additional data. The X4023x continues to output a Data Byte for each ACKNOWLEDGE received. The master terminates the read operation by not responding with an ACKNOWLEDGE and instead issuing a STOP condition. The data output is sequential, with the data from address n followed by the data from address n + 1. The address counter for read operations increments through the entire memory contents to be serially read during one operation. At the end of the address space the counter “rolls over” to address 00h and the device continues to output data for each ACKNOWLEDGE received (Refer to Figure 16). A C K S t o p A C K A C K 0 0 0 1 A C K Data (1) Data (2) Data (n-1) Data (n) (n is any integer greater than 1) Figure 16. Sequential EEPROM Read Sequence FN8115 Rev 0.00 April 11, 2005 Page 17 of 36 X40231, X40233, X40235, X40237, X40239 CS7 PUP1 CS6 CS5 CS4 CS3 CS2 CS1 CS0 V2FS V3FS BL1 BL0 RWEL WEL PUP0 NV NV NV NV Bit(s) Description WEL Write Enable Latch bit RWEL Register Write Enable Latch bit V2FS V2MON Output Flag Status V3FS V3MON Output Flag Status BL1 - BL0 Sets the Block Lock partition PUP1 - PUP0 Sets the Power-on Reset time NOTE: Bits labelled NV are nonvolatile (See “CONTROL AND STATUS REGISTER”). Figure 17. CR Register Format CONTROL AND STATUS REGISTER The Control and Status (CR) Register provides the user with a mechanism for changing and reading the status of various parameters of the X4023x (See Figure 17). The CR register is a combination of both volatile and nonvolatile bits. The nonvolatile bits of the CR register retain their stored values even when VCC is powered down, then powered back up. The volatile bits however, will always power-up to a known logic state “0” (irrespective of their value at power-down). A detailed description of the function of each of the CR register bits follows: WEL: Write Enable Latch (Volatile) The WEL bit controls the Write Enable status of the entire X4023x device. This bit must first be enabled before ANY write operation (to DCPs, EEPROM memory array, or the CR register). If the WEL bit is not first enabled, then ANY proceeding (volatile or nonvolatile) write operation to DCPs, EEPROM array, as well as the CR register, is aborted and no ACKNOWLEDGE is issued after a Data Byte. The WEL bit is a volatile latch that powers up in the disabled, LOW (0) state. The WEL bit is enabled / set by writing 00000010 to the CR register. Once enabled, the WEL bit remains set to “1” until either it is reset to “0” (by writing 00000000 to the CR register) or until the X4023x powers down, and then up again. RWEL: Register Write Enable Latch (Volatile) The RWEL bit controls the (CR) Register Write Enable status of the X4023x. Therefore, in order to write to any of the bits of the CR Register (except WEL), the RWEL bit must first be set to “1”. The RWEL bit is a volatile bit that powers up in the disabled, LOW (“0”) state. It must be noted that the RWEL bit can only be set, once the WEL bit has first been enabled (See "CR Register Write Operation"). The RWEL bit will reset itself to the default “0” state, in one of three cases: —After a successful write operation to any bits of the CR register has been completed (See Figure 18). —When the X4023x is powered down. —When attempting to write to a Block Lock protected region of the EEPROM memory (See "BL1, BL0: Block Lock protection bits - (Nonvolatile)", below). BL1, BL0: Block Lock protection bits - (Nonvolatile) The Block Lock protection bits (BL1 and BL0) are used to: —Inhibit a write operation from being performed to certain addresses of the EEPROM memory array —Inhibit a DCP write operation (changing the “wiper position”). The region of EEPROM memory which is protected / locked is determined by the combination of the BL1 and BL0 bits written to the CR register. It is possible to lock the regions of EEPROM memory shown in the table below: BL1 BL0 Protected Addresses (Size) Partition of array locked 0 0 None (Default) None (Default) 0 1 C0h - FFh (64 bytes) Upper 1/4 1 0 80h - FFh (128 bytes) Upper 1/2 1 1 00h - FFh (256 bytes) All If the user attempts to perform a write operation on a protected region of EEPROM memory, the operation is aborted without changing any data in the array. Writes to the WEL bit do not cause an internal high voltage write cycle. Therefore, the device is ready for another operation immediately after a STOP condition is executed in the CR Write command sequence (See Figure 18). FN8115 Rev 0.00 April 11, 2005 Page 18 of 36 X40231, X40233, X40235, X40237, X40239 When the Block Lock bits of the CR register are set to something other than BL1 = 0 and BL0 = 0, then the “wiper position” of the DCPs cannot be changed - i.e. DCP write operations cannot be conducted: BL1 BL0 PUP1 PUP0 Power-on Reset delay (tPURESET) 0 0 50ms 0 1 100ms (Default) DCP Write Operation Permissible 1 0 200ms 1 1 300ms 0 0 YES (Default) 0 1 NO 1 0 NO 1 1 NO The default for these bits are PUP1 = 0, PUP0 = 1. V2FS, V3FS: Voltage Monitor Status Bits (Volatile) Bits V2FS and V3FS of the CR register are latched, volatile flag bits which indicate the status of the Voltage Monitor reset output pins V2FAIL and V3FAIL. The factory default setting for these bits are BL1 = 0, BL0 = 0. IMPORTANT NOTE: If the Write Protect (WP) pin of the X4023x is active (HIGH), then all nonvolatile write operations to both the EEPROM memory and DCPs are inhibited, irrespective of the Block Lock bit settings (See "WP: Write Protection Pin"). At power-up the VxFS (x=2,3) bits default to the value “0”. These bits can be set to a “1” by writing the appropriate value to the CR register. To provide consistency between the VxFAIL and VxFS however, the status of the VxFS bits can only be set to a “1” when the corresponding VxFAIL output is HIGH. PUP1, PUP0: Power-on Reset bits – (Nonvolatile) Once the VxFS bits have been set to “1”, they will be reset to “0” if: Applying voltage to VCC activates the Power-on Reset circuit which holds RESET output HIGH, until the supply voltage stabilizes above the VTRIP1 threshold for a period of time, tPURST (See Figure 30). —The device is powered down, then back up, —The corresponding VxFAIL output becomes LOW. The Power-on Reset bits, PUP1 and PUP0 of the CR register determine the tPURST delay time of the Poweron Reset circuitry (See "VOLTAGE MONITORING FUNCTIONS"). These bits of the CR register are nonvolatile, and therefore power-up to the last written state. CR Register Write Operation The CR register is accessed using the Slave Address set to 1010010 (Refer to Figure 4). Following the Slave Address Byte, access to the CR register requires an Address Byte which must be set to FFh. Only one data byte is allowed to be written for each CR register Write operation. The user must issue a STOP, after sending this byte to the register, to initiate the nonvolatile cycle that stores the BP1, BP0, PUP1 and PUP0 bits. The X4023x will not ACKNOWLEDGE any data bytes written after the first byte is entered (Refer to Figure 18). The nominal Power-on Reset delay time can be selected from the following table, by writing the appropriate bits to the CR register: SCL SDA S T A R T 1 0 1 0 0 1 0 SLAVE ADDRESS BYTE R/W A C K 1 1 1 1 1 1 ADDRESS BYTE 1 1 A C K CS7 CS6 CS5 CS4 CS3 CS2 CS1 CS0 CR REGISTER DATA IN A C K S T O P Figure 18. CR Register Write Command Sequence FN8115 Rev 0.00 April 11, 2005 Page 19 of 36 X40231, X40233, X40235, X40237, X40239 Prior to writing to the CR register, the WEL and RWEL bits must be set using a two step process, with the whole sequence requiring 3 steps —Write a 02H to the CR Register to set the Write Enable Latch (WEL). This is a volatile operation, so there is no delay after the write. (Operation preceded by a START and ended with a STOP). —Write a 06H to the CR Register to set the Register Write Enable Latch (RWEL) AND the WEL bit. This is also a volatile cycle. The zeros in the data byte are required. (Operation preceded by a START and ended with a STOP). —Write a one byte value to the CR Register that has all the bits set to the desired state. The CR register can be represented as qxyst01r in binary, where xy are the Voltage Monitor Output Status (V2FS and V3FS) bits, st are the Block Lock Protection (BL1 and BL0) bits, and qr are the Power-on Reset delay time (tPURST) control bits (PUP1 PUP0). This operation is proceeded by a START and ended with a STOP bit. Since this is a nonvolatile write cycle, it will typically take 5ms to complete. The RWEL bit is reset by this cycle and the sequence must be repeated to change the nonvolatile bits again. If bit 2 is set to ‘1’ in this third step (qxys t11r) then the RWEL bit is set, but the V2FS, V3FS, PUP1, PUP0, BL1 and BL0 bits remain unchanged. Writing a second byte to the control register is not allowed. Doing so aborts the write operation and the X4023x does not return an ACKNOWLEDGE. For example, a sequence of writes to the device CR register consisting of [02H, 06H, 02H] will reset all of the nonvolatile bits in the CR Register to “0”. It should be noted that a write to any nonvolatile bit of CR register will be ignored if the Write Protect pin of the X4023x is active (HIGH) (See "WP: Write Protection Pin"). CR (Control) Register Read Operation The contents of the CR Register can be read at any time by performing a random read (See Figure 18). Using the Slave Address Byte set to 10100101, and an Address Byte of FFh. Only one byte is read by each register read operation. The X4023x resets itself after the first byte is read. The master should supply a STOP condition to be consistent with the bus protocol. to the CR register itself, further requires the setting of the RWEL bit. Block Lock protection of the device enables the user to inhibit writes to certain regions of the EEPROM memory, as well as to all the DCPs. One further level of data protection in the X4023x, is incorporated in the form of the Write Protection pin. WP: Write Protection Pin When the Write Protection (WP) pin is active (HIGH), it disables nonvolatile write operations to the X4023x. The table below (X4023x Write Permission Status) summarizes the effect of the WP pin (and Block Lock), on the write permission status of the device. Additional Data Protection Features In addition to the preceding features, the X4023x also incorporates the following data protection functionality: —The proper clock count and data bit sequence is required prior to the STOP bit in order to start a nonvolatile write cycle. VOLTAGE MONITORING FUNCTIONS VCC Monitoring The X4023x monitors the supply voltage and drives the RESET output HIGH (using an external “pull up” resistor) if VCC is lower than VTRIP1 threshold. The RESET output will remain HIGH until VCC exceeds VTRIP1 for a minimum time of tPURST. After this time, the RESET pin is driven to a LOW state. See Figure 30. For the Power-on / Low Voltage Reset function of the X4023x, the RESET output may be driven HIGH down to a VCC of 1V (VRVALID). See Figure 30. Another feature of the X4023x, is that the value of tPURST may be selected in software via the CR register (See “PUP1, PUP0: Power-on Reset bits – (Nonvolatile)” on page 19.). It is recommended to stop communication to the device while RESET is HIGH. Also, setting the Manual Reset (MR) pin HIGH overrides the Power-on / Low Voltage circuitry and forces the RESET output pin HIGH (See "MR: Manual Reset"). After setting the WEL and / or the RWEL bit(s) to a “1”, a CR register read operation may oCCur, without interrupting a proceeding CR register write operation. DATA PROTECTION There are a number of levels of data protection features designed into the X4023x. Any write to the device first requires setting of the WEL bit in the CR register. A write FN8115 Rev 0.00 April 11, 2005 Page 20 of 36 X40231, X40233, X40235, X40237, X40239 MR: Manual Reset VCC The RESET output can be forced HIGH externally using the Manual Reset (MR) input. MR is a de-bounced, TTL compatible input, and so it may be operated by connecting a push-button directly from VCC to the MR pin. RESET remains HIGH for time tPURST after MR has returned to its LOW state (See Figure 19). An external “pull down” resistor is required to hold this pin (normally) LOW. VTRIP1 0 Volts MR 0 Volts RESET 0 Volts tPURST Figure 19. Manual Reset Response READ Operation WRITE Operation Signals from the Master S t a r t SDA Bus Slave Address 10 1 0 0 1 0 Slave Address CS7 … CS0 1010010 0 A C K Signals from the Slave S t a r t Address Byte S t o p 1 A C K A C K Data “Dummy” Write Figure 20. CR Register Read Command Sequence X4023x Write Permission Status Block Lock Bits BL0 BL1 WP Volatile Bits Nonvolatile Bits x 1 1 NO NO NO YES NO 1 x 1 NO NO NO YES NO 0 0 1 YES NO NO YES NO x 1 0 NO NO Not in locked region YES YES 1 x 0 NO NO Not in locked region YES YES 0 0 0 YES YES Yes (All Array) YES YES FN8115 Rev 0.00 April 11, 2005 DCP Nonvolatile Write Permitted Write to EEPROM Permitted Write to CR Register Permitted DCP Volatile Write Permitted Page 21 of 36 X40231, X40233, X40235, X40237, X40239 V2MON Monitoring The X4023x asserts the V2FAIL output HIGH if the voltage V2MON exceeds the corresponding VTRIP2 threshold (See Figure 21). The bit V2FS in the CR register is then set to a “0” (assuming that it has been set to “1” after system initialization). VTRIPx Vx 0V VxFAIL 0V The V2FAIL output may remain active HIGH with VCC down to 1V. (See Figure 21) VCC VTRIP1 V3MON Monitoring 0 Volts The X4023x asserts the V3FAIL output HIGH if the voltage V3MON exceeds the corresponding VTRIP3 threshold (See Figure 21). The bit V3FS in the CR register is then set to a “0” (assuming that it has been set to “1” after system initialization). (x = 2,3) Figure 21. Voltage Monitor Response Setting a VTRIPx Voltage (x = 1,2,3) There are two procedures used to set the threshold voltages (VTRIPx), depending if the threshold voltage to be stored is higher or lower than the present value. For example, if the present VTRIPx is 2.9 V and the new VTRIPx is 3.2 V, the new voltage can be stored directly into the VTRIPx cell. If however, the new setting is to be lower than the present setting, then it is necessary to “reset” the VTRIPx voltage before setting the new value. The V3FAIL output may remain active HIGH with VCC down to 1V. VTRIPx Thresholds (x = 1,2,3) The X4023x is shipped with pre-programmed threshold (VTRIPx) voltages. In applications where the required thresholds are different from the default values, or if a higher precision / tolerance is required, the X4023x trip points may be adjusted by the user, using the steps detailed below. VTRIPx VCC V2MON, V3MON VP WP 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 SCL 00h SDA S T A R T FN8115 Rev 0.00 April 11, 2005 A0h † 01h† sets VTRIP1 09h† sets VTRIP2 Data Byte † 0Dh† sets VTRIP3 † All others Reserved. Figure 22. Setting VTRIPx to a higher level (x = 1,2,3). Page 22 of 36 X40231, X40233, X40235, X40237, X40239 Setting a Higher VTRIPx Voltage (x = 1,2,3) To set a VTRIPx threshold to a new voltage which is higher than the present threshold, the user must apply the desired VTRIPx threshold voltage to the corresponding input pin (VCC, V2MON or V3MON). Then, a programming voltage (Vp) must be applied to the WP pin before a START condition is set up on SDA. Next, issue on the SDA pin the Slave Address A0h, followed by the Byte Address 01h for VTRIP1, 09h for VTRIP2, and 0Dh for VTRIP3, and a 00h Data Byte in order to program VTRIPx. The STOP bit following a valid write operation initiates the programming sequence. Pin WP must then be brought LOW to complete the operation (See Figure 23). The user does not have to set the WEL bit in the CR register before performing this write sequence. Setting a Lower VTRIPx Voltage (x = 1,2,3). In order to set VTRIPx to a lower voltage than the present value, then VTRIPx must first be “reset” according to the procedure described below. Once VTRIPx has been “reset”, then VTRIPx can be set to the desired voltage using the procedure described in “Setting a Higher VTRIPx Voltage”. Resetting the VTRIPx Voltage (x = 1,2,3). To reset a VTRIPx voltage, apply the programming voltage (Vp) to the WP pin before a START condition is set up on SDA. Next, issue on the SDA pin the Slave Address A0h followed by the Byte Address 03h for VTRIP1, 0Bh for VTRIP2, and 0Fh for VTRIP3, followed by 00h for the Data Byte in order to reset VTRIPx. The STOP bit following a valid write operation initiates the programming sequence. Pin WP must then be brought LOW to complete the operation (See Figure 23). The user does not have to set the WEL bit in the CR register before performing this write sequence. After being reset, the value of VTRIPx becomes a nominal value of 1.7V. VTRIPx Accuracy (x = 1,2,3). The accuracy with which the VTRIPx thresholds are set, can be controlled using the iterative process shown in Figure 24. If the desired threshold is less that the present threshold voltage, then it must first be “reset” (See "Resetting the VTRIPx Voltage (x = 1,2,3)."). The desired threshold voltage is then applied to the appropriate input pin (VCC, V2MON or V3MON) and the procedure described in Section “Setting a Higher VTRIPx Voltage“ must be followed. Once the desired VTRIPx threshold has been set, the error between the desired and (new) actual set threshold can be determined. This is achieved by applying VCC to the device, and then applying a test voltage higher than the desired threshold voltage, to the input pin of the voltage monitor circuit whose VTRIPx was programmed. For example, if VTRIP2 was set to a desired level of 3.0 V, then a test voltage of 3.4 V may be applied to the voltage monitor input pin V2MON. In the case of setting of VTRIP1 then only VCC need be applied. In all cases, care should be taken not to exceed the maximum input voltage limits. After applying the test voltage to the voltage monitor input pin, the test voltage can be decreased (either in discrete steps, or continuously) until the output of the voltage monitor circuit changes state. At this point, the error between the actual/measured, and desired threshold levels is calculated. VP WP 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 SCL 00h † SDA A0h† S T A R T 03h† Resets VTRIP1 0Bh† Resets VTRIP2 0Fh† Resets VTRIP3 Data Byte Figure 23. Resetting the VTRIPx Level FN8115 Rev 0.00 April 11, 2005 † All others Reserved. Page 23 of 36 X40231, X40233, X40235, X40237, X40239 For example, the desired threshold for VTRIP2 is set to 3.0 V, and a test voltage of 3.4 V was applied to the input pin V2MON (after applying power to VCC). The input voltage is decreased, and found to trip the associated output level of pin V2FAIL from a LOW to a HIGH, when V2MON reaches 3.09 V. From this, it can be calculated that the programming error is 3.09 - 3.0 = 0.09 V. culated error. If it is the case that the error is less than zero, then the VTRIPx must be programmed to a value equal to the previously set VTRIPx plus the absolute value of the calculated error. Continuing the previous example, we see that the calculated error was 0.09V. Since this is greater than zero, we must first “reset” the VTRIP2 threshold, then apply a voltage equal to the last previously programmed voltage, minus the last previously calculated error. Therefore, we must apply VTRIP2 = 2.91 V to pin V2MON and execute the programming sequence (See "Setting a Higher VTRIPx Voltage (x = 1,2,3)"). If the error between the desired and measured VTRIPx is less than the maximum desired error, then the programming process may be terminated. If however, the error is greater than the maximum desired error, then another iteration of the VTRIPx programming sequence can be performed (using the calculated error) in order to further increase the accuracy of the threshold voltage. Using this process, the desired accuracy for a particular VTRIPx threshold may be attained using a successive number of iterations. If the calculated error is greater than zero, then the VTRIPx must first be “reset”, and then programmed to the a value equal to the previously set VTRIPx minus the cal- Note: X = 1,2,3. VTRIPx Programming NO Let: MDE = Maximum Desired Error MDE+ Desired VTRIPx < present value? Desired Value YES Acceptable Error Range MDE– Execute VTRIPx Reset Sequence Error = Actual – Desired Set Vx = desired VTRIPx New Vx applied = Old Vx applied + | Error | Execute Set Higher VTRIPx Sequence New Vx applied = Old Vx applied - | Error | Power-down Execute Reset VTRIPx Sequence Ramp up Vx NO Output switches? YES Error < MDE– Actual VTRIPx - Desired VTRIPx = Error Error >MDE+ | Error | < | MDE | DONE Figure 24. VTRIPx Setting / Reset Sequence (x = 1,2,3) FN8115 Rev 0.00 April 11, 2005 Page 24 of 36 X40231, X40233, X40235, X40237, X40239 ABSOLUTE MAXIMUM RATINGS Min. Max. Units Temperature under Bias Parameter -65 +135 °C Storage Temperature -65 +150 °C Voltage on WP pin (With respect to VSS) -1.0 +15 V Voltage on other pins (With respect to VSS) -1.0 +7 V Voltage on RHx - Voltage on RLx (x = 0,1,2. Referenced to VSS) D.C. Output Current (SDA,RESETRESET,V2FAIL,V3FAIL) VCC V 5 mA 300 °C 2.7 7 V Min. Max. Units -40 +85 °C 0 Lead Temperature (Soldering, 10 seconds) Supply Voltage Limits (Applied VCC voltage, referenced to VSS) RECOMMENDED OPERATING CONDITIONS Temperature Industrial Note: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and the functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Figure 25. Equivalent A.C. Circuit VCC = 5V 2300 SDA V2FAIL V3FAIL RESET 100pF Figure 26. DCP SPICE Macromodel RTOTAL RHx CH CL RW RLx 10pF CW 10pF 25pF (x = 0,1,2) RWx FN8115 Rev 0.00 April 11, 2005 Page 25 of 36 X40231, X40233, X40235, X40237, X40239 TIMING DIAGRAMS Figure 27. Bus Timing tHIGH tF SCL tLOW tR tSU:DAT tSU:STA SDA IN tHD:DAT tHD:STA tSU:STO tAA tDH tBUF SDA OUT Figure 28. WP Pin Timing START SCL Clk 1 Clk 9 SDA IN tSU:WP WP tHD:WP Figure 29. Write Cycle Timing SCL SDA 8th bit of last byte ACK tWC Stop Condition FN8115 Rev 0.00 April 11, 2005 Start Condition Page 26 of 36 X40231, X40233, X40235, X40237, X40239 Figure 30. Power-Up and Power-Down Timing tF tR VCC VTRIP1 0 Volts tPURST tPURST tRPD tRPD RESET 0 Volts MR 0 Volts Figure 31. Manual Reset Timing Diagram MR tMRPW 0 Volts tPURST tMRD RESET 0 Volts VCC VCC VTRIP1 Figure 32. V2MON, V3MON Timing Diagram tRx tFx Vx VTRIPx tRPDx tRPDx tRPDx 0 Volts tRPDx VxFAIL 0 Volts VCC VTRIP1 VRVALID Note : x = 2,3. FN8115 Rev 0.00 April 11, 2005 0 Volts Page 27 of 36 X40231, X40233, X40235, X40237, X40239 Figure 33. VTRIPX Programming Timing Diagram (x=1,2,3). VCC, V2MON, V3MON VTRIPx tTSU tTHD VP WP tVPS tVPO SCL tWC 00h SDA NOTE : V1/VCC must be greater than V2MON, V3MON when programming. tVPH Figure 34. DCP “Wiper Position” Timing Rwx (x=0,1,2) RWX(n+1) RWX(n) RWX(n-1) tWR Time n = tap position SCL SDA S 1 T A R T 0 1 0 1 1 1 SLAVE ADDRESS BYTE FN8115 Rev 0.00 April 11, 2005 0 A WT C K 0 0 0 0 0 INSTRUCTION BYTE P1 P0 A C K D7 D6 D5 D4 D3 D2 D1 D0 DATA BYTE A C K S T O P Page 28 of 36 X40231, X40233, X40235, X40237, X40239 D.C. OPERATING CHARACTERISTICS Symbol Parameter Min VCC 2.7 ICC1(1) Current into VCC Pin (X4023x: Active) Read memory array (3) Write nonvolatile memory VCC = 3.5V ICC2(2) Current into VCC Pin (X4023x:Standby) With 2-Wire bus activity (3) No 2-Wire bus activity VCC = 3.5V ILI ILO Typ Max Unit Test Conditions / Notes 5.5 V Requires VCC > VTRIP1 or chip will not operate. 0.4 1.5 mA fSCL = 400KHz A VSDA = VCC MR = VSS WP = VSS or Open/Floating VSCL= VCC (when no bus activity else fSCL = 400kHz) 10 A VIN(4) = GND to VCC. 10 A 10 A 50.0 50.0 Input Leakage Current (SCL, SDA, MR) 0.1 Input Leakage Current (WP) Output Leakage Current (SDA, RESET, 0.1 V2FAIL, V3FAIL) VOUT(5) = GND to VCC. X4023x is in Standby(2) VTRIP1PR VTRIP1 Programming Range 2.75 4.70 V VTRIPxPR VTRIPx Programming Range (x = 2,3) 1.75 3.50 V VTRIP1(6) Pre - programmed VTRIP1 threshold 2.8 4.3 2.95 4.45 3.00 4.50 V Factory shipped default option A Factory shipped default option B VTRIP2(6) Pre - programmed VTRIP2 threshold 2.05 2.8 2.20 2.95 2.25 3.00 V Factory shipped default option A Factory shipped default option B VTRIP3(6) Pre - programmed VTRIP3 threshold 1.60 1.60 1.75 1.75 1.80 1.80 V Factory shipped default option A Factory shipped default option B tRPDx VCC, V2MON, V3MON to RESET, V2FAIL, V3FAIL propagation delay (respectively) 20 s See (8) IVx V2MON Input leakage current V3MON Input leakage current 1 1 A VIL(7) Input LOW Voltage (SCL, SDA, WP, MR) -0.5 0.8 V 2.0 VCC +0.5 V 0.4 V VIH(7) Input HIGH Voltage (SCL,SDA, WP, MR) VOLx RESET, V2FAIL, V3FAIL, SDA Output Low Voltage VSDA = VSCL = VCC Others = GND or VCC ISINK = 2.0mA Notes: 1. The device enters the Active state after any START, and remains active until: 9 clock cycles later if the Device Select Bits in the Slave Address Byte are incorrect; 200nS after a STOP ending a read operation; or tWC after a STOP ending a write operation. Notes: 2. The device goes into Standby: 200nS after any STOP, except those that initiate a high voltage write cycle; tWC after a STOP that initiates a high voltage cycle; or 9 clock cycles after any START that is not followed by the correct Device Select Bits in the Slave Address Byte. Notes: 3. Current through external pull up resistor not included. Notes: 4. VIN = Voltage applied to input pin. Notes: 5. VOUT = Voltage applied to output pin. Notes: 6. See “ORDERING INFORMATION” on page 36. Notes: 7. VIL Min. and VIH Max. are for reference only and are not tested Notes: 8. Equivalent input circuit for VXMON VXMON + VREF FN8115 Rev 0.00 April 11, 2005 – Page 29 of 36 X40231, X40233, X40235, X40237, X40239 A.C. CHARACTERISTICS (See Figure 27, Figure 28, Figure 29) 400kHz Symbol Min Max Units SCL Clock Frequency 0 400 kHz Pulse width Suppression Time at inputs 50 tAA SCL LOW to SDA Data Out Valid 0.1 tBUF Time the bus free before start of new transmission 1.3 s tLOW Clock LOW Time 1.3 s tHIGH Clock HIGH Time 0.6 s tSU:STA Start Condition Setup Time 0.6 s tHD:STA Start Condition Hold Time 0.6 s tSU:DAT Data In Setup Time 100 ns tHD:DAT Data In Hold Time 0 s tSU:STO Stop Condition Setup Time 0.6 s 50 fSCL tIN (5) Parameter ns s 0.9 tDH Data Output Hold Time tR(5) SDA and SCL Rise Time 20 +.1Cb(2) 300 ns ns tF(5) SDA and SCL Fall Time 20 +.1Cb(2) 300 ns tSU:WP WP Setup Time 0.6 tHD:WP WP Hold Time 0 Cb Capacitive load for each bus line s s 400 pF A.C. TEST CONDITIONS Input Pulse Levels 0.1VCC to 0.9VCC Input Rise and Fall Times 10ns Input and Output Timing Levels 0.5VCC Output Load See Figure 25 NONVOLATILE WRITE CYCLE TIMING Symbol Parameter tWC(4) Min. Typ.(1) Max. Units 5 10 ms Nonvolatile Write Cycle Time CAPACITANCE (TA = 25°C, F = 1.0 MHZ, VCC = 5V) Symbol COUT(5) CIN(5) Parameter Max Units Test Conditions Output Capacitance (SDA, RESET, V2FAIL, V3FAIL) 8 pF VOUT = 0V Input Capacitance (SCL, WP, MR) 6 pF VIN = 0V Notes: 1. Typical values are for TA = 25°C and VCC = 5.0V Notes: 2. Cb = total capacitance of one bus line in pF. Notes: 3. Over recommended operating conditions, unless otherwise specified Notes: 4. tWC is the time from a valid STOP condition at the end of a write sequence to the end of the self-timed internal nonvolatile write cycle. It is the minimum cycle time to be allowed for any nonvolatile write by the user, unless Acknowledge Polling is used. Notes: 5. This parameter is not 100% tested. FN8115 Rev 0.00 April 11, 2005 Page 30 of 36 X40231, X40233, X40235, X40237, X40239 POTENTIOMETER CHARACTERISTICS Limits Symbol Parameter Min. Typ. Max. Units Test Conditions/Notes In a ratiometric circuit, RTOTAL divides out of the equation and accuracy is determined by XDCP resolution. RTOL End to End Resistance Tolerance -20 +20 % VRHx RH Terminal Voltage (x = 0,1,2) VSS VCC V VRLx RL Terminal Voltage (x = 0,1,2) VSS VSS V PR Power Rating(1) 10 mW RTOTAL = 10kDCP0, DCP1) 5 mW RTOTAL = 100kDCP2) 200 400  VCC = 5 V, VRHx = VCC, VRLx = VSS (x = 0,1,2), IW = 50 uA /500 uA (100/10k. 400 1200  VCC = 2.7 V, VRHx = VCC, VRLx = VSS (x = 0,1,2), IW = 27 uA /270 uA (100/10 k. 4.4 mA RW IW DCP Wiper Resistance Wiper Current Noise RL Terminal internally tied to gnd. mV (Hz) RTOTAL = 10kDCP0, DCP1) mV (Hz) RTOTAL = 100kDCP2) Absolute Linearity(2) -1 +1 MI(4) Rw(n)(actual) - Rw(n)(expected) Relative Linearity(3) -1 +1 MI(4) Rw(n+1) - [Rw(n) + MI] RTOTAL Temperature Coefficient ±300 ppm/°C RTOTAL = 10kDCP0, DCP1) ±300 ppm/°C RTOTAL = 100kDCP2) ppm/°C (Voltage divider configuration) Ratiometric Temperature Coefficient CH/CL/ CW Potentiometer Capacitances twr Wiper Response time ±30 10/10/25 200 pF See Figure 26. s See Figure 34. Notes: 1. Power Rating between the wiper terminal RWX(n) and the end terminals RHX VSS - for ANY tap position n, (x = 0,1,2). Notes: 2. Absolute Linearity is utilized to determine actual wiper resistance versus, expected resistance = (Rwx(n)(actual) - Rwx(n)(expected)) = ±1 Ml Maximum (x = 0,1,2). Notes: 3. Relative Linearity is a measure of the error in step size between taps = RWx(n+1) - [Rwx(n) + Ml] = ±0.2 Ml (x = 0,1,2) Notes: 4. 1 Ml = Minimum Increment = RTOT / (Number of taps in DCP - 1). Notes: 5. Typical values are for TA = 25°C and nominal supply voltage. Notes: 6. This parameter is periodically sampled and not 100% tested. FN8115 Rev 0.00 April 11, 2005 Page 31 of 36 X40231, X40233, X40235, X40237, X40239 VTRIPX (X = 1,2,3) PROGRAMMING PARAMETERS (See Figure 33) Parameter Description Min Typ Max Units tVPS VTRIPx Program Enable Voltage Setup time 10 s tVPH VTRIPx Program Enable Voltage Hold time 10 s tTSU VTRIPx Setup time 10 s tTHD VTRIPx Hold (stable) time 10 s tVPO VTRIPx Program Enable Voltage Off time (Between successive adjustments) 1 ms tWC VTRIPx Write Cycle time VP Programming Voltage Vta VTRIPx Program Voltage accuracy Programmed at 25°C.) Vtv VTRIP Program variation after programming (-40 - 85°C). (Programmed at 25°C.) -25 Notes: 5 10 ms 10 15 V -100 +100 mV +25 mV +10 100% tested. RESET, V2FAIL, V3FAIL OUTPUT TIMING. (See Figure 30, Figure 31, Figure 32) Symbol tPURST tMRD (31)(2) Description Power-on Reset delay time Condition Min. PUP1 = 0, PUP0 = 0 25 PUP1 = 0, PUP0 = 1 50 PUP1 = 1, PUP0 = 0 100 PUP1 = 1, PUP0 = 1 150 MR to RESET propagation delay See (1)(2)(4) Typ. Max. Units 50 75 ms 100 150 ms 200 300 ms 300 450 ms 5 s tMRDPW MR pulse width 500 tRPDx VCC, V2MON, V3MON to RESET, V2FAIL, V3FAIL propagation delay (respectively) tFx VCC, V2MON, V3MON Fall Time 20 mV/s tRx VCC, V2MON, V3MON Rise Time 20 mV/s VRVALID VCC for RESET, V2FAIL, V3FAIL Valid(3). 1 V See (5) ns 20 s Notes: 1. See Figure 31 for timing diagram. Notes: 2. See Figure 25 for equivalent load. Notes: 3. This parameter describes the lowest possible VCC level for which the outputs RESET, V2FAIL, and V3FAIL will be correct with respect to their inputs (VCC, V2MON, V3MON). Notes: 4. From MR rising edge crossing VIH, to RESET rising edge crossing VOH. Notes: 5. Equivalent input circuit for VXMON VXMON + VREF – OUTPUT tRPDX = 20µs worst case FN8115 Rev 0.00 April 11, 2005 Page 32 of 36 X40231, X40233, X40235, X40237, X40239 APPENDIX 1 DCP1 (100 Tap) Tap position to Data Byte translation Table Data Byte Tap Position Decimal Binary 0 0 0000 0000 1 1 0000 0001 . . . . . . 23 23 0001 0111 24 24 0001 1000 25 56 0011 1000 26 55 0011 0111 . . . . . . 48 33 0010 0001 49 32 0010 0000 50 64 0100 0000 51 65 0100 0001 . . . . . . 73 87 0101 0111 74 88 0101 1000 75 120 0111 1000 76 119 0111 0111 . . . . . . 98 97 0110 0001 99 96 0110 0000 FN8115 Rev 0.00 April 11, 2005 Page 33 of 36 X40231, X40233, X40235, X40237, X40239 APPENDIX 2 DCP1 (100 Tap) tap position to Data Byte translation algorithm example. unsigned DCP1_TAP_Position(int tap_pos) { int block; int i; int offset; int wcr_val; offset block = 0; = tap_pos / 25; if (block < 0) return ((unsigned)0); else if (block