ZHCSG68F MARCH 2017 – JANUARY 2019 TPSM846C23
PRODUCTION DATA.
The VOUT_SCALE_LOOP command is is limited to only 2 possible options/ratios: 1 (default, no RSET needed), 0.5 (RSET= 10 kΩ). Attempting to write a value unequal to one of these options cause the device to set the cml bit in the STATUS_BYTE, and the ivd bit in the STATUS_CML registers. Additionally, SMBALERT is asserted and the value of VOUT_SCALE_LOOP remains unchanged. The contents of this register can be stored to nonvolatile memory using the STORE_DEFAULT_ALL command.
For loop slave device, this command cannot be accessed. 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.
NOTE
Construct the feedback resistor ratio appropriately (see Table 5). If the
VOUT_SCALE_LOOP does not match the external feedback resistor ratio, the converter will regulate the output with the reference voltage as outlined in Equation 2. Program the VOUT_SCALE_LOOP setting before the output is turned on.
For the range checking to work properly and to avoid invalid data scenarios:
| COMMAND | VOUT_SCALE_LOOP | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Format | Linear, two’s complement binary | |||||||||||||||
| Bit Position | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| Access | r | r | r | r | r | r | r | r | r | r | r | r | r | r/wE | r/wE | r/wE |
| Function | Exponent | Mantissa | ||||||||||||||
| Default Value | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 |