SLUSBO6C JANUARY 2014 – October 2018 TPS40425
PRODUCTION DATA.
| Format | Linear | ||||
| Description | The VREF_TRIM command is used to apply a fixed offset voltage to the reference voltage.
VREF = 600 mV + (VREF_TRIM + STEP_VREF_MARGIN_x) × 2 mV The maximum trim range is 10% / –20% of nominal VREF (600 mV) in 2-mV steps. Permissible values are from 60 mV to –120 mV. Including settings from both VREF_TRIM and STEP_VREF_MARGIN_x commands, the net permissible range of VREF is 60 mV to –180 mV. If the commanded VREF_TRIM is outside its valid range, then that value is not accepted; it also causes the device to set the ’cml’ bit in the STATUS_BYTE and the ‘ivd’ bit in the STATUS_CML registers, and triggers SMB_ALERT. If the combined VREF set by VREF_TRIM and/or STEP_VREF_MARGIN_x is outside the acceptable range, it causes the device to set the ’cml’ bit in the STATUS_BYTE and the ‘ivd’ bit in the STATUS_CML registers, it triggers SMB_ALERT, and the VREF are set to the highest or lowest allowed value (based on the commanded level). The VREF transition occurs at the rate determined by the TON_RISE (61h) command if the transition is executed during soft-start. Any transition in VREF after soft-start occurs at the rate determined by the highest programmable TON_RISE of 9 ms. The VREF_TRIM has two data bytes formatted as two’s complement binary integer and can have positive and negative values. If the channel is configured as a SLAVE, this command can not be accessed for that channel. Any writes to the SLAVE channel for this command is ignored. (In analog, the master programmed value are used in a multi-phase system. No special action needed from digital.) An attempt to write the SLAVE channel command, or when in AVS mode results in a NACK’d command and the reporting of an IVC fault and triggering of SMB_ALERT. |
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| Default | 0000h (Fixed Offset Voltage = 0 V)
The default power-up state can be changed using the STORE_USER commands. |
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| PAGE0, PAGE1 | |||||||||||||||
| r/wE | r* | r* | r* | r* | r* | r* | r* | r* | r* | r/wE | r/wE | r/wE | r/wE | r/wE | r/wE |
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| High Byte | Low Byte | ||||||||||||||
| Bits | Field Name | Description |
|---|---|---|
| 7:0 | High Byte | (Format: binary)
Default: 0000 0000 (bin) Minimum: 1111 1111 (bin) (sign extended) Maximum: 0000 0000 (bin) (sign extended) Bits 6:0 changes for sign extension but are not otherwise programmable |
| 7:0 | Low Byte | (Format: binary)
Default: 0000 0000 (bin) 0 (dec) 0 mV Minimum: 1100 0100 (bin) –60 (dec) (–120 mV) (sign extended, twos compliment) Maximum: 0001 1110 (bin) 30 (dec) (60 mV) Bits 7:6 changes for sign extension but are not otherwise programmable |