TMP1827 datasheet(39/68 Pages) TI

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8.5 Programming

The TMP1827 has multiple methods in which an application can access the device functions for temperature

conversion and EEPROM programming. When accessing multiple device the MATCHADDR command along

with the 64-bit device address must be used. If the short address has been programmed uniquely, then the host

may use the FLEXADDR command along with the 8-bit short address must be used.

The sections below describe the sequences that must be followed to access the device functions properly.

8.5.1 Single Device Temperature Conversion and Read

Figure 8-25 shows the program flow that the host MCU must execute for temperature conversion and

subsequent read of the temperature result. As the temperature results are the first two bytes of the register

scratchpad, the host may optionally stop the read after the device transmits the first two bytes by performing a

bus reset.

RST

ATR

SKIPADDR

CONVERTTEMP

CCh

44h

WAIT t

DELAY + tCONV

RST

ATR

SKIPADDR

READ SP-1

CCh

BEh

8 BYTES DEVICE

DATA

CRC

Figure 8-25. Single Device Temperature Conversion and Read Programming Flow

8.5.2 Multiple Device Temperature Conversion and Read

Figure 8-26 shows the program flow that the host MCU must execute for temperature conversion and

subsequent read of the temperature result for multiple devices. The host must use the MATCHADDR command

or the FLEXADDR command to address each device on the bus, because the devices do not arbitrate on a

read function.

RST

ATR

SKIPADDR

CONVERTTEMP

CCh

44h

WAIT t

DELAY + tCONV

RST

ATR

MATCHADDR

READ SP-1

55h

BEh

8 BYTES DEVICE

DATA

CRC

8-BYTE ADDRESS

DEVICE-1

RST

ATR

MATCHADDR

READ SP-1

55h

BEh

8 BYTES DEVICE

DATA

CRC

8-BYTE ADDRESS

DEVICE-N

Figure 8-26. Multiple Device Temperature Conversion and Read Programming Flow

8.5.3 Register Scratchpad Update and Commit

Figure 8-27 shows the sequence the host must execute to update the register scratchpad and commit to the

configuration EEPROM. The host must read the scratchpad to ensure it can perform the correct read modify

write to the register locations, before it commits the same to the configuration EEPROM.

If the host has only one device, or if the application can guarantee no bus corruption, then it may use SKIPADDR

command to globally update and commit the register scratchpad region. However once committed and locked, it

is not possible for the host to update the locations anymore, and hence TI strongly advises that the host still read

the locations before running the commit operation.

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TMP1827

SBOSA15 – SEPTEMBER 2022

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