ZHCSOF7B september 2022 – june 2023 TPS25990
PRODUCTION DATA
READ_BB_RAM is a manufacturer-specific command used to read the contents of the Blackbox buffer RAM, which is seven (7) bytes deep as described in Section 8.3.14.11.
This command uses the PMBus? block read protocol with a block size of seven (7).
Table 9-69 presents details of the Blackbox RAM registers. There are seven (7) Blackbox RAM registers, starting from BB_RAM_0 to BB_RAM_6. Descriptions of all seven (7) registers (BB_RAM_0 to BB_RAM_6) are identical.
| Bit | Name | Value | Description | Default | Access |
|---|---|---|---|---|---|
7:5 | EVENT_ID | Event identifier | Read | ||
111 | VIN_UV_WARN | 000 | |||
110 | VIN_OV_WARN | ||||
101 | OC_WARN | ||||
100 | OT_WARN | ||||
011 | OC_DET | ||||
010 | VIN_TRAN | ||||
001 | IN_OP_WARN | ||||
000 | None | ||||
4 | BB_TMR_EXP | Blackbox timer expiry | |||
1 | Blackbox timer overflowed at least once since the last event | 0 | |||
0 | Blackbox timer has not overflowed | ||||
3:0 | BB_TICK | 0000 | Blackbox tick timer | 0000 |
The Blackbox RAM contents get reset under the following events:
Input power recycle at VIN or VDD pin
ENABLE recycling
CLEAR_FAULTS command
Initiation of an auto-retry sequence