TMP1827 datasheet(34/68 Pages) TI

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8.4.3.3.2 WRITE SCRATCHPAD-1 (4Eh)

The function is issued by the host to write the functional register 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.

Additionally, the host can issue a bus reset at any time during the transfer, though it is advised that the same

may be done only at byte boundary to ensure that there is no register corrupted due to incomplete transfer.

When the FLEX_ADDR_MODE bits are updated as a non-zero value, the host must hold off on any

communication to keep the bus in idle state for either tRESDET or tDELAY, as per the requested flex mode, to allow

the device to decode and update the short address. Also when the FLEX_ADDR_MODE bits have a non-zero

value, the byte for short address register shall not be updated in the register scratchpad, for any subsequent

write scratchpad-1 operations, to avoid the overwrite of the decoded short address.

Note

When updating the OD_EN and/or LOCK_EN bit in the device configuration-2 register, the host

controller must send the 9 bytes and wait for the CRC transmission before the change of device speed

or write protection of the register scratchpad can take effect. If the host terminates the transfer before

the complete CRC transmission, then any update to OD_EN and/or LOCK_EN shall not take effect.

8.4.3.3.3 READ SCRATCHPAD-1 (BEh)

The function is issued by the host to read the temperature result, status bits, and functional registers from the

of the 8 bytes. If the host wants to continue the read operation, the host will receive the next 8 bytes along with

CRC for the last 8 bytes. The host can terminate the function at any point by issuing a bus reset.

8.4.3.3.4 COPY SCRATCHPAD-1 (48h)

The function is issued by the host to copy the functional registers content to the EEPROM. As shown in

Figure 8-22, the temperature alert registers, configuration register, short address register, and temperature offset

registers are stored in the configuration EEPROM. There are 9 bytes being copied from the register space to

TMP1827

SBOSA15 – SEPTEMBER 2022

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TMP1827 Datasheet(PDF) 34 Page - Texas Instruments