JAJSIO3 データシート

JAJSIO3A February 2020 – September 2020 TPS546B24A

PRODUCTION DATA

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7.6.41 (4Ah) IOUT_OC_WARN_LIMIT

CMD Address	4Ah
Write Transaction:	Write Word
Read Transaction:	Read Word
Format:	SLINEAR11 per CAPABILITY
Phased:	Yes
NVM Back-up:	EEPROM or Pin Detection
Updates:	On-the-fly

The IOUT_OC_WARN_LIMIT command sets the value of the output current, in amperes, that causes the overcurrent detector to indicate an overcurrent warning condition. The units are amperes.

IOUT_OC_WARN_LIMIT is a phased command. Each phase will report an output current overcurrent warning independently.

In response to an overcurrent warning condition, the TPS546B24A takes the following action:

Set the NONE OF THE ABOVE bit in the STATUS_BYTE.
Set the IOUT bit in the STATUS_WORD.
Set the IOUT_OCW bit in the STATUS_IOUT register.
Notify the host per PMBus 1.3.1 Part II specification, section 10.2.

Figure 7-47 (4Ah) IOUT_OC_WARN_LIMIT Register Map

15	14	13	12	11	10	9	8
RW	RW	RW	RW	RW	RW	RW	RW
IOOCW_EXP					IOOCW_MAN

7	6	5	4	3	2	1	0
RW	RW	RW	RW	RW	RW	RW	RW
IOOCW_MAN

LEGEND: R/W = Read/Write; R = Read only

Table 7-58 Register Field Descriptions

Bit	Field	Access	Reset	Description
15:11	IOOCW_ EXP	RW	11110b	Linear format two’s complement exponent
10:0	IOOCW_ MAN	RW	NVM	Linear format two’s complement mantissa Supported values up to 31 A times the number of phases.

Bit

Field

Access

Reset

Description

15:11

IOOCW_ EXP

11110b

Linear format two’s complement exponent

10:0

IOOCW_ MAN

NVM

Linear format two’s complement mantissa

Supported values up to 31 A times the number of phases.

Attempts to write (4Ah) IOUT_OC_WARN_LIMIT to any value outside those specified as valid will be considered invalid/unsupported data and cause the TPS546B24A to respond by flagging the appropriate status bits and notifying the host according to the PMBus 1.3.1 Part II specification section 10.9.3.

Command Resolution and NVM Store/Restore Behavior

The Per-PHASE (PHASE != FFh) IOUT_OC_WARN_LIMIT is implemented in analog hardware. The analog hardware supports current limits from 4 A to 31 A in 1-A steps. Programmed values not exactly equal to hardware supported values will be rounded up to the next available supported value. Values less than 8 A per device can be written to IOUT_OC_FAULT_LIMIT, but values less than 4 A per device will be implemented as 4 A in hardware. The TPS546B24A provides only limited NVM-backed options for this command. Following a power-cycle or NVM Store/Restore operation, the value will be rounded to the nearest NVM supported value. The NVM supports values up to 31 A in 0.25-A steps.

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発注情報

7.6.41 (4Ah) IOUT_OC_WARN_LIMIT