Pointer Register

Serial

Interface

Local Temp

Remote Temp 1

Remote Temp 3

Remote Temp 4

Remote Temp 2

Configuration

Lock Initialization

Remote 1 Offset

Remote 1 K -factor

Remote 1 THERM

Remote 1 THERM2

Remote 2 Offset

Remote 2 K -factor

Remote 2 THERM

Remote 2 THERM2

Remote 3 Offset

Remote 3 K -factor

Remote 3 THERM

Remote 3 THERM2

Remote 4 Offset

Remote 4 K -factor

Remote 4 THERM

Remote 4 THERM2

SDA

SCL

Device ID

Manufacturer ID

Local THERM Limit

Local THERM2 Limit

2

2

2

2

2

THERM Hysterisis

Software Reset

THERM Status

Remote Open Status

THERM2 Status

21

TMP464

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SBOS835C – MAY 2017 – REVISED OCTOBER 2019

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7.6.1 Register Information

The TMP464 device contains multiple registers for holding configuration information, temperature measurement

results, and status information. These registers are described in Figure 19 and Table 3.

7.6.1.1 Pointer Register

Figure 19 shows the internal register structure of the TMP464 device. The 8-bit pointer register addresses a

given data register. The pointer register identifies which of the data registers must respond to a read or write

command on the two-wire bus. This register is set with every write command. A write command must be issued

to set the proper value in the pointer register before executing a read command. Table 3 describes the pointer

register and the internal structure of the TMP464 registers. The power-on-reset (POR) value of the pointer

register is 00h (0000 0000b). Table 3 lists a summary of the pointer values for the different registers. Writing data

to unassigned pointer values are ignored and does not affect the operation of the device. Reading an

unassigned register returns undefined data and is ACKed.

Figure 19. TMP464 Internal Register Structure

7.6.1.2 Local and Remote Temperature Value Registers

The TMP464 device has multiple 16-bit registers that hold 13-bit temperature measurement results. The 13 bits

of the local temperature sensor result are stored in register 00h. The 13 bits of the four remote temperature

sensor results are stored in registers 01h through 04h. The four assigned LSBs of both the local (LT3:LT0) and

remote (RT3:RT0) sensors indicate the temperature value after the decimal point (for example, if the temperature

result is 10.0625°C, then the high byte is 0000 0101 and the low byte is 0000 1000). These registers are read-

only and are updated by the ADC each time a temperature measurement is complete. Asynchronous reads are

supported, so a read operation can occur at any time and results in valid conversion results being transmitted

once the first conversion is complete after power up for the channel being accessed. If after power up a read is

initiated before a conversion is complete, the read operation results in all zeros (0x0000).

7.6.1.3 Software Reset Register

The Software Reset Register allows the user to reset the TMP464 registers through software by setting the reset

bit (RST, bit 15) to 1. The power-on-reset value for this register is 0x0000. Resets are ignored when the device is

in lock mode, so writing a 1 to the RST bit does not reset any registers.