ADM1062ACPZ

FEATURES FUNCTIONAL BLOCK DIAGRAM Rev. D DP DN REFIN REFOUT REFGND SDA SCL A1 A0 ADM1062 TEMP SENSOR VREF INTERNAL DIODE MUX Complete supervisory and sequencing solution for up to 10 supplies 10 supply fault detectors enable supervision of supplies to DPLIMx In addition, the DAC output buffer is three-stated if DNLIMx > DPLIMx. By programming the limit registers this way, the user can make it very difficult for the DAC output buffers to be turned on during normal system operation. The limit registers are among the registers downloaded from the EEPROM at startup. Rev. D | Page 24 of 35 Data Sheet ADM1062 TEMPERATURE MEASUREMENT SYSTEM The ADM1062 contains an on-chip, band gap temperature sensor whose output is digitized by the on-chip, 12-bit ADC. Theoretically, the temperature sensor and the ADC can measure temperatures from −128°C to +128°C with a resolution of 0.125°C. Because this exceeds the operating temperature range of the device, local temperature measurements outside this range are not possible. Temperature measurements from −128°C to +128°C are possible using a remote sensor. The output code is in offset binary format, with −128°C given by Code 0x400, 0°C given by Code 0x800, and +128°C given by Code 0xC00. Figure 36 shows the input signal conditioning used to measure the output of a remote temperature sensor. This figure shows the external sensor as a substrate transistor provided for temperature monitoring on some microprocessors, but it could equally be a discrete transistor such as a 2N3904 or 2N3906. If a discrete transistor is used, the collector is not grounded and should be linked to the base. If a PNP transistor is used, the base is connected to the DN input, and the emitter is connected to the DP input. If an NPN transistor is used, the emitter is connected to the DN input, and the base is connected to the DP input. Figure 34 and Figure 35 show how to connect the ADM1062 to an NPN or PNP transistor for temperature measurement. To prevent ground noise from interfering with the measurement, the more negative terminal of the sensor is not referenced to ground but is biased above ground by an internal diode at the DN input. As with the other analog inputs to the ADC, a limit register is provided for each of the temperature input channels. Therefore, a temperature limit can be set such that if it is exceeded, a warning is generated and available as an input to the sequencing engine. This enables users to control their sequence or monitor functions based on an overtemperature or undertemperature event. REMOTE TEMPERATURE MEASUREMENT ADM1062 2N3904 NPN DP 04433-070 The ADM1062 can measure the temperature of a remote diode sensor or diode-connected transistor connected to Pin DN and Pin DP (Pin 37 and Pin 38 on the LFCSP package and Pin 44 and Pin 45 on the TQFP package). DN Figure 34. Measuring Temperature Using an NPN Transistor The forward voltage of a diode or diode-connected transistor operated at a constant current exhibits a negative temperature coefficient of about −2 mV/°C. Unfortunately, the absolute value of VBE varies from device to device, and individual calibration is required to null it, making the technique unsuitable for mass production. The technique used in the ADM1062 is to measure the change in VBE when the device is operated at two different currents. ADM1062 DP DN 04433-071 2N3906 PNP Figure 35. Measuring Temperature Using a PNP Transistor The change in VBE is given by ΔVBE = kT/q × ln(N) where: k is Boltzmann’s constant. q is the charge on the carrier. T is the absolute temperature in Kelvin. N is the ratio of the two currents. VDD REMOTE SENSING TRANSISTOR I THERM DA DP THERM DC DN N×I IBIAS VOUT+ TO ADC BIAS DIODE LOW-PASS FILTER fC = 65kHz Figure 36. Signal Conditioning for Remote Diode Temperature Sensors Rev. D | Page 25 of 35 VOUT– 04433-069 CPU ADM1062 Data Sheet To measure ΔVBE, the sensor is switched between operating currents of I and N × I. The resulting waveform is passed through a 65 kHz low-pass filter to remove noise and through a chopperstabilized amplifier that amplifies and rectifies the waveform to produce a dc voltage proportional to ΔVBE. This voltage is measured by the ADC to produce a temperature output in 12-bit offset binary. To further reduce the effects of noise, digital filtering is performed by averaging the results of 16 measurement cycles. A remote temperature measurement takes nominally 600 ms. The results of remote temperature measurements are stored in 12-bit, offset binary format, as shown in Table 11. This format provides temperature readings with a resolution of 0.125°C. Table 11. Temperature Data Format Temperature −128°C −125°C −100°C −75°C −50°C −25°C −10°C 0°C +10.25°C +25.5°C +50.75°C +75°C +100°C +125°C +128°C Rev. D | Page 26 of 35 Digital Output (Hex) 0x400 0x418 0x4E0 0x5A8 0x670 0x738 0x7B0 0x800 0x852 0x8CC 0x996 0xA58 0XB20 0xBE8 0xC00 Digital Output (Binary) 010000000000 010000011000 010011100000 010110101000 011001110000 011100111000 011110110000 100000000000 100001010010 100011001100 100110010110 101001011000 101100100000 101111101000 110000000000 Data Sheet ADM1062 APPLICATIONS DIAGRAM 12V IN 12V OUT 5V IN 5V OUT 3V IN 3V OUT IN DC-TO-DC1 VH 5V OUT 3V OUT 3.3V OUT 2.5V OUT 1.8V OUT 1.2V OUT 0.9V OUT POWRON EN OUT 3.3V OUT ADM1062 VP1 VP2 VP3 VP4 VX1 VX2 VX3 PDO1 PDO2 VX4 PDO6 IN DC-TO-DC2 PDO3 PDO4 PDO5 RESET PDO7 VX5 PDO8 EN 2.5V OUT PWRGD SIGNAL VALID IN SYSTEM RESET DC-TO-DC3 EN PDO9 PDO10 REFOUT OUT OUT 1.8V OUT 3.3V OUT DAC1* DP IN DN REFIN VCCP VDDCAP GND LDO EN OUT 0.9V OUT 3.3V OUT 10µF 10µF 10µF IN *ONLY ONE MARGINING CIRCUIT SHOWN FOR CLARITY. DAC1 TO DAC6 ALLOW MARGINING FOR UP TO SIX VOLTAGE RAILS. EN OUT 1.2V OUT TRIM DC-TO-DC4 TEMPERATURE DIODE 2.5V OUT MICROPROCESSOR 04433-068 3.3V OUT Figure 37. Applications Diagram Rev. D | Page 27 of 35 ADM1062 Data Sheet COMMUNICATING WITH THE ADM1062 CONFIGURATION DOWNLOAD AT POWER-UP The configuration of the ADM1062 (undervoltage/overvoltage thresholds, glitch filter timeouts, PDO configurations, and so on) is dictated by the contents of the RAM. The RAM comprises digital latches that are local to each of the functions on the device. The latches are double-buffered and have two identical latches, Latch A and Latch B. Therefore, when an update to a function occurs, the contents of Latch A are updated first, and then the contents of Latch B are updated with identical data. The advantages of this architecture are explained in detail in the Updating the Configuration section. The two latches are volatile memory and lose their contents at power-down. Therefore, the configuration in the RAM must be restored at power-up by downloading the contents of the EEPROM (nonvolatile memory) to the local latches. This download occurs in six steps, as follows: 1. 2. 3. 4. 5. 6. With no power applied to the device, the PDOs are all high impedance. When 1.2 V appears on any of the inputs connected to the VDD arbitrator (VH or VPx), the PDOs are all weakly pulled to GND with a 20 kΩ resistor. When the supply rises above the undervoltage lockout of the device (UVLO is 2.5 V), the EEPROM starts to download to the RAM. The EEPROM downloads its contents to all Latch As. When the contents of the EEPROM are completely downloaded to the Latch As, the device controller signals all Latch As to download to all Latch Bs simultaneously, completing the configuration download. At 0.5 ms after the configuration download completes, the first state definition is downloaded from the EEPROM into the SE. Note that any attempt to communicate with the device prior to the completion of the download causes the ADM1062 to issue a no acknowledge (NACK). UPDATING THE CONFIGURATION After power-up, with all the configuration settings loaded from the EEPROM into the RAM registers, the user may need to alter the configuration of functions on the ADM1062, such as changing the undervoltage or overvoltage limit of an SFD, changing the fault output of an SFD, or adjusting the rise time delay of one of the PDOs. The ADM1062 provides several options that allow the user to update the configuration over the SMBus interface. The following three options are controlled in the UPDCFG register: Option 1 Update the configuration in real time. The user writes to the RAM across the SMBus, and the configuration is updated immediately. Option 2 Update the Latch As without updating the Latch Bs. With this method, the configuration of the ADM1062 remains unchanged and continues to operate in the original setup until the instruction is given to update the Latch Bs. Option 3 Change the EEPROM register contents without changing the RAM contents, and then download the revised EEPROM contents to the RAM registers. With this method, the configuration of the ADM1062 remains unchanged and continues to operate in the original setup until the instruction is given to update the RAM. The instruction to download from the EEPROM in Option 3 is also a useful way to restore the original EEPROM contents if revisions to the configuration are unsatisfactory. For example, if the user needs to alter an overvoltage threshold, the RAM register can be updated, as described in Option 1. However, if the user is not satisfied with the change and wants to revert to the original programmed value, the device controller can issue a command to download the EEPROM contents to the RAM again, as described in Option 3, restoring the ADM1062 to its original configuration. The topology of the ADM1062 makes this type of operation possible. The local, volatile registers (RAM) are all doublebuffered latches. Setting Bit 0 of the UPDCFG register to 1 leaves the double-buffered latches open at all times. If Bit 0 is set to 0 when a RAM write occurs across the SMBus, only the first side of the double-buffered latch is written to. The user must then write a 1 to Bit 1 of the UPDCFG register. This generates a pulse to update all the second latches at once. EEPROM writes occur in a similar way. The final bit in this register can enable or disable EEPROM page erasure. If this bit is set high, the contents of an EEPROM page can all be set to 1. If this bit is set low, the contents of a page cannot be erased, even if the command code for page erasure is programmed across the SMBus. The bit map for the UPDCFG register is shown in the AN-698 Application Note. A flow diagram for download at power-up and subsequent configuration updates is shown in Figure 38. Rev. D | Page 28 of 35 Data Sheet ADM1062 SMBus E E P R O M L D DEVICE CONTROLLER R A M L D D A T A U P D LATCH A LATCH B EEPROM FUNCTION (OV THRESHOLD ON VP1) 04433-035 POWER-UP (VCC > 2.5V) Figure 38. Configuration Update Flow Diagram UPDATING THE SEQUENCING ENGINE Sequencing engine (SE) functions are not updated in the same way as regular configuration latches. The SE has its own dedicated 512-byte nonvolatile, electrically erasable, programmable, readonly memory (EEPROM) for storing state definitions. The EEPROM provides 63 individual states, each with a 64-bit word (one state is reserved). At power-up, the first state is loaded from the SE EEPROM into the engine itself. When the conditions of this state are met, the next state is loaded from the EEPROM into the engine, and so on. The loading of each new state takes approximately 10 μs. To alter a state, the required changes must be made directly to the EEPROM. RAM for each state does not exist. The relevant alterations must be made to the 64-bit word, which is then uploaded directly to the EEPROM. The major differences between the EEPROM and other registers are as follows:    An EEPROM location must be blank before it can be written to. If it contains data, the data must first be erased. Writing to the EEPROM is slower than writing to the RAM. Writing to the EEPROM should be restricted because it has a limited write/cycle life of typically 10,000 write operations due to the usual EEPROM wear-out mechanisms. The first EEPROM is split into 16 (0 to 15) pages of 32 bytes each. Page 0 to Page 6, starting at Address 0xF800, hold the configuration data for the applications on the ADM1062 (such as the SFDs and PDOs). These EEPROM addresses are the same as the RAM register addresses, prefixed by F8. Page 7 is reserved. Page 8 to Page 15 are for customer use. INTERNAL REGISTERS Data can be downloaded from the EEPROM to the RAM in one of the following ways: The ADM1062 contains a large number of data registers. The principal registers are the address pointer register and the configuration registers.   Address Pointer Register The address pointer register contains the address that selects one of the other internal registers. When writing to the ADM1062, the first byte of data is always a register address that is written to the address pointer register. Configuration Registers The configuration registers provide control and configuration for various operating parameters of the ADM1062. EEPROM The ADM1062 has two 512-byte cells of nonvolatile EEPROM from Register Address 0xF800 to Register Address 0xFBFF. The EEPROM is used for permanent storage of data that is not lost when the ADM1062 is powered down. One EEPROM cell contains the configuration data of the device; the other contains the state definitions for the SE. Although referred to as read-only memory, the EEPROM can be written to, as well as read from, using the serial bus in exactly the same way as the other registers. At power-up, when Page 0 to Page 6 are downloaded By setting Bit 0 of the UDOWNLD register (0xD8), which performs a user download of Page 0 to Page 6 SERIAL BUS INTERFACE The ADM1062 is controlled via the serial system management bus (SMBus) and is connected to this bus as a slave device under the control of a master device. It takes approximately 1 ms after power-up for the ADM1062 to download from its EEPROM. Therefore, access to the ADM1062 is restricted until the download is complete. Identifying the ADM1062 on the SMBus The ADM1062 has a 7-bit serial bus slave address (see Table 12). The device is powered up with a default serial bus address. The five MSBs of the address are set to 00101; the two LSBs are determined by the logical states of Pin A1 and Pin A0. This allows the connection of four ADM1062 devices to one SMBus. Table 12. Serial Bus Slave Address A1 Pin Low Low High High 1 A0 Pin Low High Low High Hex Address 0x28 0x2A 0x2C 0x2E 7-Bit Address1 0010100x 0010101x 0010110x 0010111x x = Read/Write bit. The address is shown only as the first 7 MSBs. Rev. D | Page 29 of 35 ADM1062 Data Sheet The device also has several identification registers (read-only) that can be read across the SMBus. Table 13 lists these registers with their values and functions. Table 13. Identification Register Values and Functions Name MANID REVID MARK1 MARK2 Address 0xF4 0xF5 0xF6 0xF7 Value 0x41 0x02 0x00 0x00 Function Manufacturer ID for Analog Devices Silicon revision Software brand Software brand General SMBus Timing Figure 39, Figure 40, and Figure 41 are timing diagrams for general read and write operations using the SMBus. The SMBus specification defines specific conditions for different types of read and write operations, which are discussed in the Write Operations and Read Operations sections. The general SMBus protocol operates as follows: Step 1 It may be an instruction telling the slave device to expect a block write, or it may be a register address that tells the slave where subsequent data is to be written. Because data can flow in only one direction, as defined by the R/W bit, sending a command to a slave device during a read operation is not possible. Before a read operation, it may be necessary to perform a write operation to tell the slave what sort of read operation to expect and/or the address from which data is to be read. Step 3 When all data bytes have been read or written, stop conditions are established. In write mode, the master pulls the data line high during the 10th clock pulse to assert a stop condition. In read mode, the master device releases the SDA line during the low period before the ninth clock pulse, but the slave device does not pull it low. This is known as a no acknowledge. The master then takes the data line low during the low period before the 10th clock pulse and then high during the 10th clock pulse to assert a stop condition. SCL Held Low Timeout The master initiates data transfer by establishing a start condition, defined as a high-to-low transition on the serial data (SDA) line, while the serial clock-line (SCL) remains high. This indicates that a data stream follows. All slave peripherals connected to the serial bus respond to the start condition and shift in the next eight bits, consisting of a 7-bit slave address (MSB first) plus an R/W bit. This bit determines the direction of the data transfer, that is, whether data is written to or read from the slave device (0 = write, 1 = read). The peripheral whose address corresponds to the transmitted address responds by pulling the data line low during the low period before the ninth clock pulse, known as the acknowledge bit, and by holding it low during the high period of this clock pulse. All other devices on the bus remain idle while the selected device waits for data to be read from or written to it. If the R/W bit is a 0, the master writes to the slave device. If the R/W bit is a 1, the master reads from the slave device. Step 2 Data is sent over the serial bus in sequences of nine clock pulses: eight bits of data followed by an acknowledge bit from the slave device. Data transitions on the data line must occur during the low period of the clock signal and remain stable during the high period because a low-to-high transition when the clock is high could be interpreted as a stop signal. If the operation is a write operation, the first data byte after the slave address is a command byte. This command byte tells the slave device what to expect next. If the bus master holds the SCL low for a time that is a multiple of approximately 30 ms, the ADM1062 bus interface may timeout. If this timeout happens, the in progress transaction is NACKed, and the transaction must be repeated. This behavior is only seen if the I2C bus master is interrupted midtransaction by a higher priority task that delays completion of the transaction. False Start Detection The data hold time specification defines the time that data must be valid on the SDA line, following an SCL falling edge. If there are multiple ADM1062 devices on the same bus, one of the ADM1062 devices may see the SCL/SDA transition due to an acknowledge (ACK) from a different device as a start condition because of internal timing skew, which for most transactions, this is not an issue. In a case where the data appearing on the bus after the false start is detected happens to match the address of another ADM1062 on the bus, that device may incorrectly ACK. A bus master may see this ACK as another bus master talking on the bus, halt the bus transaction, and not produce any more clocks on the SCL. As a result, the ADM1062 device that incorrectly ACKed continues to hold down the SDA line low. To retry the halted bus transaction, the bus master performs a clock flush on the SCL by sending a series of up to 16 clock pulses. The clock flush forces the ADM1062 to release the SDA line. Rev. D | Page 30 of 35 Data Sheet ADM1062 1 9 1 9 SCL 0 1 0 1 A1 A0 D7 R/W D6 D5 D4 D3 D2 D1 ACK. BY SLAVE START BY MASTER FRAME 1 SLAVE ADDRESS FRAME 2 COMMAND CODE 1 SCL (CONTINUED) SDA (CONTINUED) 9 D7 D6 D5 D4 D3 D0 ACK. BY SLAVE D2 D1 1 D7 D0 9 D6 D5 ACK. BY SLAVE FRAME 3 DATA BYTE D4 D3 D2 D1 D0 ACK. BY SLAVE FRAME N DATA BYTE STOP BY MASTER 04433-036 0 SDA Figure 39. General SMBus Write Timing Diagram 1 9 1 9 SCL 0 1 0 1 A1 A0 R/W D7 D6 D5 D4 D3 D2 D1 ACK. BY SLAVE START BY MASTER 1 SCL (CONTINUED) SDA (CONTINUED) D7 FRAME 1 SLAVE ADDRESS D6 D5 D4 D3 9 D2 FRAME 3 DATA BYTE D1 D0 ACK. BY MASTER D0 1 D7 FRAME 2 DATA BYTE D6 D5 ACK. BY MASTER D4 9 D3 D2 FRAME N DATA BYTE D1 D0 NO ACK. STOP BY MASTER Figure 40. General SMBus Read Timing Diagram tR tF t HD; STA t LO W SCL t HI G H t HD; STA t HD; DAT t SU; STA t SU; STO t SU; DAT t BUF P S S Figure 41. Serial Bus Timing Diagram Rev. D | Page 31 of 35 P 04433-038 SDA 04433-037 0 SDA ADM1062 Data Sheet SMBus PROTOCOLS FOR RAM AND EEPROM In the ADM1062, the send byte protocol is used for two purposes: The ADM1062 contains volatile registers (RAM) and nonvolatile registers (EEPROM). User RAM occupies Address 0x00 to Address 0xDF; the EEPROM occupies Address 0xF800 to Address 0xFBFF.  S  WRITE OPERATIONS The SMBus specification defines several protocols for different types of read and write operations. The following abbreviations are used in Figure 42 to Figure 50: S = Start P = Stop R = Read W = Write A = Acknowledge A = No acknowledge Send Byte In a send byte operation, the master device sends a single command byte to a slave device, as follows: 3. 4. 5. 6. W 4 5 6 A RAM ADDRESS (0x00 TO 0xDF) A P To erase a page of EEPROM memory. EEPROM memory can be written to only if it is unprogrammed. Before writing to one or more EEPROM memory locations that are already programmed, the page(s) containing those locations must first be erased. EEPROM memory is erased by writing a command byte. The master sends a command code telling the slave device to erase the page. The ADM1062 command code for a page erasure is 0xFE (1111 1110). Note that for a page erasure to take place, the page address must be given in the previous write word transaction (see the Write Byte/Word section). In addition, Bit 2 in the UPDCFG register (Address 0x90) must be set to 1. 1 2 S SLAVE ADDRESS W 3 4 5 6 A COMMAND BYTE (0xFE) A P Figure 43. EEPROM Page Erasure The ADM1062 uses the following SMBus write protocols. 1. 2. SLAVE ADDRESS 3 Figure 42. Setting a RAM Address for Subsequent Read Page erasure is enabled by setting Bit 2 in the UPDCFG register (Address 0x90) to 1. If this bit is not set, page erasure cannot occur, even if the command byte (0xFE) is programmed across the SMBus.       2 04433-039 1 04433-040 Data can be written to and read from both the RAM and the EEPROM as single data bytes. Data can be written only to unprogrammed EEPROM locations. To write new data to a programmed location, the location contents must first be erased. EEPROM erasure cannot be done at the byte level. The EEPROM is arranged as 32 pages of 32 bytes each, and an entire page must be erased. To write a register address to the RAM for a subsequent single byte read from the same address, or for a block read or a block write starting at that address, as shown in Figure 42. The master device asserts a start condition on SDA. The master sends the 7-bit slave address followed by the write bit (low). The addressed slave device asserts an acknowledge (ACK) on SDA. The master sends a command code. The slave asserts an ACK on SDA. The master asserts a stop condition on SDA, and the transaction ends. Rev. D | Page 32 of 35 As soon as the ADM1062 receives the command byte, page erasure begins. The master device can send a stop command as soon as it sends the command byte. Page erasure takes approximately 20 ms. If the ADM1062 is accessed before erasure is complete, it responds with a no acknowledge (NACK). Data Sheet ADM1062 Write Byte/Word Block Write In a write byte/word operation, the master device sends a command byte and one or two data bytes to the slave device, as follows: In a block write operation, the master device writes a block of data to a slave device. The start address for a block write must have been set previously. In the ADM1062, a send byte operation sets a RAM address, and a write byte/word operation sets an EEPROM address, as follows: In the ADM1062, the write byte/word protocol is used for three purposes:  To write a single byte of data to the RAM. In this case, the command byte is RAM Address 0x00 to RAM Address 0xDF, and the only data byte is the actual data, as shown in Figure 44. 1 2 3 4 5 6 7 8 The master device asserts a start condition on SDA. The master sends the 7-bit slave address followed by the write bit (low). 3. The addressed slave device asserts an ACK on SDA. 4. The master sends a command code that tells the slave device to expect a block write. The ADM1062 command code for a block write is 0xFC (1111 1100). 5. The slave asserts an ACK on SDA. 6. The master sends a data byte that tells the slave device how many data bytes are being sent. The SMBus specification allows a maximum of 32 data bytes in a block write. 7. The slave asserts an ACK on SDA. 8. The master sends N data bytes. 9. The slave asserts an ACK on SDA after each data byte. 10. The master asserts a stop condition on SDA to end the transaction. 1. 2. 1 04433-041 RAM SLAVE W A S ADDRESS ADDRESS A DATA A P (0x00 TO 0xDF) Figure 44. Single Byte Write to the RAM 1 2 3 4 5 6 Because a page consists of 32 bytes, only the three MSBs of the address low byte are important for page erasure. The lower five bits of the EEPROM address low byte specify the addresses within a page and are ignored during an erase operation. To write a single byte of data to the EEPROM. In this case, the command byte is the high byte of EEPROM Address 0xF8 to EEPROM Address 0xFB. The first data byte is the low byte of the EEPROM address, and the second data byte is the actual data, as shown in Figure 46. 3 4 5 6 7 5 6 7 8 9 10 8 9 10 EEPROM EEPROM SLAVE ADDRESS ADDRESS S ADDRESS W A A A DATA A P HIGH BYTE LOW BYTE (0xF8 TO 0xFB) (0x00 TO 0xFF) There must be at least N locations from the start address to the highest EEPROM address (0xFBFF) to avoid writing to invalid addresses. An address crosses a page boundary. In this case, both pages must be erased before programming. Note that the ADM1062 features a clock extend function for writes to EEPROM. Programming an EEPROM byte takes approximately 250 μs, which limits the SMBus clock for repeated or block write operations. The ADM1062 pulls SCL low and extends the clock pulse when it cannot accept any more data. 04433-043 2   Figure 45. Setting an EEPROM Address 1 4 Unlike some EEPROM devices that limit block writes to within a page boundary, there is no limitation on the start address when performing a block write to EEPROM, except when 7 8 EEPROM EEPROM SLAVE ADDRESS ADDRESS S ADDRESS W A A A P HIGH BYTE LOW BYTE (0xF8 TO 0xFB) (0x00 TO 0xFF)  3 Figure 47. Block Write to the EEPROM or RAM To set up a 2-byte EEPROM address for a subsequent read, write, block read, block write, or page erase. In this case, the command byte is the high byte of EEPROM Address 0xF8 to EEPROM Address 0xFB. The only data byte is the low byte of the EEPROM address, as shown in Figure 45. 04433-042  2 S SLAVE W A COMMAND 0xFC A BYTE A DATA A DATA A DATA A P ADDRESS (BLOCK WRITE) COUNT 1 2 N 04433-044 The master device asserts a start condition on SDA. The master sends the 7-bit slave address followed by the write bit (low). 3. The addressed slave device asserts an ACK on SDA. 4. The master sends a command code. 5. The slave asserts an ACK on SDA. 6. The master sends a data byte. 7. The slave asserts an ACK on SDA. 8. The master sends a data byte or asserts a stop condition. 9. The slave asserts an ACK on SDA. 10. The master asserts a stop condition on SDA to end the transaction. 1. 2. Figure 46. Single Byte Write to the EEPROM Rev. D | Page 33 of 35 ADM1062 Data Sheet 10. 11. 12. 13. The ADM1062 uses the following SMBus read protocols. Receive Byte In a receive byte operation, the master device receives a single byte from a slave device, as follows: 3. 4. 5. 6. The master device asserts a start condition on SDA. The master sends the 7-bit slave address followed by the read bit (high). The addressed slave device asserts an ACK on SDA. The master receives a data byte. The master asserts a NACK on SDA. The master asserts a stop condition on SDA, and the transaction ends. S R 3 4 5 6 A DATA A P 04433-045 2 SLAVE ADDRESS Figure 48. Single Byte Read from the EEPROM or RAM Block Read In a block read operation, the master device reads a block of data from a slave device. The start address for a block read must have been set previously. In the ADM1062, this is done by a send byte operation to set a RAM address, or a write byte/word operation to set an EEPROM address. The block read operation itself consists of a send byte operation that sends a block read command to the slave, immediately followed by a repeated start and a read operation that reads out multiple data bytes, as follows: 1. 2. 3. 4. 5. 6. 7. 8. 9. 3 4 5 6 7 8 9 10 11 12 SLAVE COMMAND 0xFD SLAVE BYTE DATA R A A A W A A S ADDRESS (BLOCK READ) ADDRESS COUNT 1 13 DATA A 32 P Figure 49. Block Read from the EEPROM or RAM Error Correction The ADM1062 provides the option of issuing a packet error correction (PEC) byte after a write to the RAM, a write to the EEPROM, a block write to the RAM/EEPROM, or a block read from the RAM/ EEPROM. This option enables the user to verify that the data received by or sent from the ADM1062 is correct. The PEC byte is an optional byte sent after the last data byte has been written to or read from the ADM1062. The protocol is the same as a block read for Step 1 to Step 12 and then proceeds as follows: In the ADM1062, the receive byte protocol is used to read a single byte of data from a RAM or EEPROM location whose address has previously been set by a send byte or write byte/word operation, as shown in Figure 48. 1 S 2 The master device asserts a start condition on SDA. The master sends the 7-bit slave address followed by the write bit (low). The addressed slave device asserts an ACK on SDA. The master sends a command code that tells the slave device to expect a block read. The ADM1062 command code for a block read is 0xFD (1111 1101). The slave asserts an ACK on SDA. The master asserts a repeat start condition on SDA. The master sends the 7-bit slave address followed by the read bit (high). The slave asserts an ACK on SDA. The ADM1062 sends a byte-count data byte that tells the master how many data bytes to expect. The ADM1062 always returns 32 data bytes (0x20), which is the maximum allowed by the SMBus Version 1.1 specification. 13. The ADM1062 issues a PEC byte to the master. The master checks the PEC byte and issues another block read if the PEC byte is incorrect. 14. A NACK is generated after the PEC byte to signal the end of the read. 15. The master asserts a stop condition on SDA to end the transaction. Note that the PEC byte is calculated using CRC-8. The frame check sequence (FCS) conforms to CRC-8 by the polynomial C(x) = x8 + x2 + x1 + 1 See the SMBus Version 1.1 specification for details. An example of a block read with the optional PEC byte is shown in Figure 50. 1 S 2 3 4 5 6 7 8 9 10 11 12 SLAVE W A COMMAND 0xFD A S SLAVE R A BYTE A DATA A ADDRESS (BLOCK READ) ADDRESS COUNT 1 Rev. D | Page 34 of 35 13 14 15 DATA 32 A PEC A P Figure 50. Block Read from the EEPROM or RAM with PEC 04433-047 1. 2. 1 The master asserts an ACK on SDA. The master receives 32 data bytes. The master asserts an ACK on SDA after each data byte. The master asserts a stop condition on SDA to end the transaction. 04433-046 READ OPERATIONS Data Sheet ADM1062 OUTLINE DIMENSIONS 6.10 6.00 SQ 5.90 31 1 0.50 BSC TOP VIEW 0.80 0.75 0.70 10 11 20 BOTTOM VIEW 0.25 MIN FOR PROPER CONNECTION OF THE EXPOSED PAD, REFER TO THE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SECTION OF THIS DATA SHEET. 0.05 MAX 0.02 NOM COPLANARITY 0.08 0.20 REF SEATING PLANE 4.25 4.10 SQ 3.95 EXPOSED PAD 21 0.45 0.40 0.35 PIN 1 INDICATOR 40 30 05-06-2011-A PIN 1 INDICATOR 0.30 0.25 0.18 COMPLIANT TO JEDEC STANDARDS MO-220-WJJD. Figure 51. 40-Lead Lead Frame Chip Scale Package [LFCSP_WQ] 6 mm × 6 mm Body, Very Very Thin Quad (CP-40-9) Dimensions shown in millimeters 0.75 0.60 0.45 1.20 MAX 9.00 BSC SQ 37 36 48 1 PIN 1 1.05 1.00 0.95 0.15 0.05 SEATING PLANE 0.20 0.09 7° 3.5° 0° 0.08 MAX COPLANARITY 7.00 BSC SQ TOP VIEW 0° MIN (PINS DOWN) 12 13 25 24 VIEW A VIEW A 0.50 0.27 BSC 0.22 LEAD PITCH 0.17 ROTATED 90° CCW COMPLIANT TO JEDEC STANDARDS MS-026ABC Figure 52. 48-Lead Thin Plastic Quad Flat Package [TQFP] (SU-48) Dimensions shown in millimeters ORDERING GUIDE Model1 ADM1062ACPZ ADM1062ACPZ-REEL7 ADM1062ASUZ ADM1062ASUZ-REEL7 EVAL-ADM1062TQEBZ 1 Temperature Range −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C Package Description 40-Lead Lead Frame Chip Scale Package [LFCSP_WQ] 40-Lead Lead Frame Chip Scale Package [LFCSP_WQ] 48-Lead Thin Plastic Quad Flat Package [TQFP] 48-Lead Thin Plastic Quad Flat Package [TQFP] Evaluation Kit (TQFP Version) Z = RoHS Compliant Part. I2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors). ©2005–2015 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D04433-0-1/15(D) Rev. D | Page 35 of 35 Package Option CP-40-9 CP-40-9 SU-48 SU-48