TMP1827 datasheet(32/65 Pages) TI

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Function = 4Eh (WRITE

SCRATCHPAD-1)?

Yes

Host waits for conversion

time. Line held IDLE

Host Sends Function

Function = 44h

(CONVERT TEMP)?

Function = 48h (COPY

SCRATCHPAD-1)?

Function = BEh (READ

SCRATCHPAD-1)?

Host Sends

DEVICE_CONFIG1 Byte

Host Sends SHORT_ADDR

Byte

Host Sends

TEMP_ALERT_LOW MSB

Byte

Host Sends

TEMP_ALERT_LOW LSB

Byte

Host waits for EEPROM

programming time. Line

held IDLE

TMP18xx Sends

Scratchpad Byte starting

at Byte-0 (LSB First)

Host Sent Reset?

Have first 8 bytes

been read?

TMP18xx Sends CRC Byte

Back to Start

Yes

Host Sends

TEMP_OFFSET_MSB Byte

TMP18xx Sends CRC Byte

Host Sends

DEVICE_CONFIG2 Byte

Host Sends

TEMP_ALERT_HIGH LSB

Byte

Host Sends

TEMP_ALERT_HIGH MSB

Byte

Host Sends

TEMP_OFFSET_LSB Byte

TMP18xx Sends

Scratchpad Byte starting

at Byte-8 (LSB First)

Host Sent Reset?

Have last 8 bytes

been read?

TMP18xx Sends CRC Byte

Yes

Figure 9-22. Function Phase Flowchart for Register Space

9.4.3.3.1 CONVERTTEMP (44h)

The function is issued by the host when the host wants the temperature sensors on the bus to perform a

one-shot temperature conversion.

When the device is bus powered, the host must keep the bus idle for the duration of the active temperature

conversion. The active temperature conversion time is dependent on the conversion mode. After temperature

conversion has completed, the result is updated in temperature result LSB and temperature result MSB and

status registers.

When automatic temperature conversion mode is enabled in the device configuration-1 register, the command

will be ignored.

9.4.3.3.2 WRITE SCRATCHPAD-1 (4Eh)

The function is issued by the host to write the functional registers for the temperature sensor. Following the

function byte, the host transmits the device configuration registers, short address register, temperature alert

low limit registers, temperature alert high limit registers and temperature offset registers. After sending the 9

bytes, the device shall transmit the CRC computed on the 9 bytes and send the CRC back to the host for quick

verification of data integrity.

TMP1827

SBOSA15A – SEPTEMBER 2022 – REVISED MAY 2023

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