ZHCSNL3A December 2021 – November 2023 TPSM8D6C24
PRODUCTION DATA
| CMD Address | 21h |
| Write Transaction: | Write Word |
| Read Transaction: | Read Word |
| Format: | ULINEAR16, Absolute Only per VOUT_MODE |
| Phased: | No |
| NVM Backup: | EEPROM or Pin Detection |
| Updates: | On-the-fly |
VOUT_COMMAND causes the device to set its output voltage to the commanded value with two data bytes. Output voltage changes due to VOUT_COMMAND occur at the rate specified by VOUT_TRANSITION_RATE.
When PGD/RST_B is configured as a RESET# pin in MISC_OPTIONS, assertion of the PGD/RST_B pin causes the output voltage to return to the VBOOT value, and causes the VOUT_COMMAND value to be updated accordingly.
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
| RW | RW | RW | RW | RW | RW | RW | RW |
| VOUT_COMMAND (High Byte) | |||||||
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| RW | RW | RW | RW | RW | RW | RW | RW |
| VOUT_COMMAND (Low Byte) | |||||||
| LEGEND: R/W = Read/Write; R = Read only |
| Bit | Field | Access | Reset | Description |
|---|---|---|---|---|
| 15:0 | VOUT_ COMMAND | RW | NVM | Sets the output voltage target through the PMBus interface. |
At power up, the reset value of VOUT_COMMAND is derived from either pin-detection on the VSEL pin, or from the NVM, depending on the VOUT_COMMAND bit in PIN_DETECT_OVERRIDE.
When the VOUT_COMMAND bit in PIN_DETECT_OVERRIDE = 0b, the default value of VOUT_COMMAND is restored from NVM at power-on reset or RESTORE_USER_ALL.
When the VOUT_COMMAND bit in PIN_DETECT_OVERRIDE = 1b, the default value of VOUT_COMMAND is derived from pin-detection on the VSEL pin, at power-on reset or RESTORE_USER_ALL.
This default value, whether derived from pin detection, or NVM becomes the “default” output voltage (also referred to as “VBOOT”), and is stored in RAM separately from the current value of VOUT_COMMAND.
BOOT Voltage Behavior
The RESET_FLT bit in MISC_OPTIONS selects the VOUT_COMMAND behavior following a fault-related shutdown. When RESET_FLT = 0b, the device retains the current value of VOUT_COMMAND during HICCUP after a fault. When RESET_FLT = 1b, VOUT_COMMAND will reset to the last detected VSEL voltage or the NVM STORED value for VOUT_COMMAND as selected by the VOUT_COMMAND bit in MISC_OPTIONS.
Data Validity
Writes to VOUT_COMMAND for which the resulting value, including any offset from VOUT_TRIM is greater than the current VOUT_MAX or less than the current VOUT_MIN, causes the reference DAC to move to the value specified by VOUT_MIN or VOUT_MAX respectively, and causes the VOUT_MAX_MIN_WARNING fault condition, setting the appropriate bits in STATUS_WORD, STATUS_VOUT and notifying the host per the PMBus 1.3.1 Part II specification, section 10.2.