SLVSH95 July 2024 TPS546C25
ADVANCE INFORMATION
| CMD Address | 02h |
| Write Transaction: | Write Byte |
| Read Transaction: | Read Byte |
| NVM Back-up: | EEPROM |
| Updates: | On-the-fly |
The ON_OFF_CONFIG command configures the combination of enable pin input and PMBus commands needed to enable/disable power conversion. This includes how the unit responds when power is applied to PVIN. For the purposes of ON_OFF_CONFIG, the device pin CNTL is the CONTROL pin.
If the device is configured as a secondary device, the device will respond as bit 4 (PU) = 0b regardless of the state of the ON_OFF_CONFIG bits, the CNTL pin, and the PMBus ON bit, and any writes to this command will be ignored. An attempt to read or write this command will result in a NACK'd command, the reporting of an IVC fault, and triggering of SMB_ALERT. The recommendation is to connect all CNTL pins together when in a stacked configuration.
Return to Supported PMBus Commands.
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| R | R | R | R/W | R/W | R/W | R | R/W |
| 0 | 0 | 0 | PU | CMD | CPR | POL | CPA |
| LEGEND: R/W = Read/Write; R = Read only |
| Bit | Field | Access | Reset | Description |
|---|---|---|---|---|
| 7:5 | Reserved | R | 000b | Not used and always set to 0. |
| 4 | PU | R/W | NVM | 0b: Device starts power conversion any time the input power is present regardless
of the state of the CONTROL(1) pin. 1b: Act on CONTROL pin and/or (01h) OPERATION command to start/stop power conversion as programmed in bits [3:0] in ON_OFF_CONFIG. |
| 3 | CMD | R/W | NVM | 0b: Ignore (01h) OPERATION command to start/stop power
conversion. 1b: Act on (01h) OPERATION command (and CONTROL pin if configured by CP) to start/stop power conversion. |
| 2 | CPR | R/W | NVM | 0b: Ignore CONTROL pin to start/stop power conversion. 1b: Act on CONTROL pin (and (01h) OPERATION command if configured by bit [3]) to start/stop power conversion. |
| 1 | POL | R | 1b | 1b: CONTROL pin has active high polarity. |
| 0 | CPA | RW | NVM | 0b: When power conversion is commanded OFF by the CONTROL pin (must be configured
to respect the CONTROL pin as above), continue regulating for the time Section 7.44, then ramp the output voltage down in the time
defined by Section 7.45. 1b: When power conversion is commanded OFF by the CONTROL pin (must be configured to respect the CONTROL pin as above), stop power conversion immediately. |
Attempts to write ON_OFF_CONFIG to any value other than those explicitly listed above will be considered invalid/unsupported data and cause the device 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.