SLUSF28 Data sheet

SLUSF28 November 2023 TPS546A24S

PRODUCTION DATA

Package Options

Mechanical Data (Package|Pins)

RVF|40
- MPQF268C

Thermal pad, mechanical data (Package|Pins)

RVF|40
- QFND333E

Orderable Information

6.6.25 (29h) VOUT_SCALE_LOOP

CMD Address	29h
Write Transaction:	Write Word
Read Transaction:	Read Word
Format:	SLINEAR11 per CAPABILITY
Phased:	No
Updates:	Conversion Disable: on-the-fly. Conversion Enable: hardware update blocked. To update hardware after write while enabled, store to NVM with STORE_USER_ALL and RESTORE_USER_ALL or cycle AVIN below UVLO.
NVM Back-up:	EEPROM or Pin Detection

VOUT_SCALE_LOOP allows PMBus devices to map between the commanded voltage and the voltage at the control circuit input. In the TPS546A24S, VOUT_SCALE_LOOP also programs an internal precision resistor divider so no external divider is required.

Figure 6-31 (29h) VOUT_SCALE_LOOP Register Map

15	14	13	12	11	10	9	8
RW	RW	RW	RW	RW	RW	RW	RW
VOSL_EXP					VOSL_MAN

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

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

Table 6-39 Register Field Descriptions

Bit	Field	Access	Reset	Description
15:11	VOSL_ EXP	RW	11001b	Linear format two’s complement exponent
10:0	VOSL_ MAN	RW	NVM	Linear format two’s complement mantissa

Data Validity

Every binary value between the minimum and maximum supported values is writeable and readable. However, not every combination is supported in hardware. Refer to Table 6-40:

Table 6-40 Accepted Values

VOUT_SCALE_LOOP (DECODED)	INTERNAL DIVIDER SCALING FACTOR
Less than or equal to 0.125	0.125
0.125 < VOSL ≤ 0.25	0.25
0.25 < VOSL ≤ 0.5	0.5
Greater than 0.5	1.0

Attempts to write (29h) VOUT_SCALE_LOOP to any value outside those specified as valid will be considered invalid/unsupported data and cause the TPS546A24S 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.

If a (29h) VOUT_SCALE_LOOP value other than a supported Internal Divider Scaling Factor is programmed into (29h) VOUT_SCALE_LOOP, (21h) VOUT_COMMAND to VREF scale factors are calculated based on the actual (29h) VOUT_SCALE_LOOP value. (29h) VOUT_SCALE_LOOP values other than supported Internal Divider Scaling Factors can produce a mismatch between (21h) VOUT_COMMAND and the actual commanded output voltage.