TMP139AIYAHT datasheet(31/58 Pages) TI

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Table 7-8. DEVCTRL CCC Command Definitions (continued)

Field

Description

Values

Action

REGMOD

Identifies if it is a

generic or specific

0 = Generic Access

TMP139 understand the DEVCTRL DATA byte as generic data bytes

described in Table 7-9

1 = Register Access

TMP139 understand the DEVCTRL DATA byte as specific register

access bytes.

If PEC is disabled, the format used for specific register access is as

per Figure 7-11.

If PEC is enabled, the format used for specific register access is as

per Figure 7-13

Table 7-9. Generic Data Byte Format

DEVCTRL DATA Bit

Function

Values

Action

DEVCTRL DATA 0 [7]

PEC Enable

0 = Disable

MR18 register PEC_EN bit is updated

1 = Enable

DEVCTRL DATA 0 [6]

Parity Disable

0 = Enable

MR18 register PAR_DIS bit is updated

1 = Disable

DEVCTRL DATA 0 [5:0]

Reserved

DEVCTRL DATA 1 [7:4]

Reserved

DEVCTRL DATA 1 [3]

Global IBI Clear

0 = No action

MR27 register CLR_GLOBAL bit is updated

1 = Clear all events and

pending IBI

DEVCTRL DATA 1 [2:0]

Reserved

DEVCTRL DATA 2 [7:0]

Reserved

DEVCTRL DATA 3 [7:0]

Reserved

Note

TMP139 NACKs the DEVCTRL CCC if the previous transaction has a parity or PEC error and the host

starts the transaction with a Repeated Start.

7.4.7 I/O Operation

The device comes up in the I2C mode of operation with an open-drain I/O for its interface. However, when the

device is in I3C mode, the I/O may be either open drain or push pull. The dynamic switching between open-drain

and push-pull mode is primarily meant to support In Band Interrupts (IBI). Table 7-10 describes the different

modes of operation for the I/O for each cycle.

Table 7-10. TMP139 Dynamic I/O Operation for I3C Mode

OPERATION

OPEN-DRAIN MODE PUSH-PULL MODE

Start + Device Address

Yes

Start + 7'h7E IBI Header Byte

Yes

REPEAT Start + Device Address

Yes

REPEAT Start + 7'h7E IBI Header Byte

Yes

CCC Bytes (after 7'h7E+R/W=0+ACK)

Yes

STOP

Yes

ACK/NACK Responses

Yes

Interrupt Request by TMP139 + Device Address

Yes

Command and address operations

Yes

IBI Payload

Yes

Write Data, T-bit sequence

Yes

Read Data, T-bit sequence

Yes

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TMP139

SNIS217 – DECEMBER 2020

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