SLUSE97 November 2023 BQ76905
PRODUCTION DATA
At initial power-up of the BQ76905 device from a SHUTDOWN state, the device progresses through a sequence of events before entering NORMAL mode operation. These are described in Table 8-2 for an example configuration, with approximate timing shown.
STEP | COMMENT | APPROXIMATE TIME (RELATIVE TO WAKEUP EVENT) |
---|---|---|
Wakeup event | Either the TS pin or the VC0 pin is pulled up, triggering the device to exit SHUTDOWN mode | 0 |
REGOUT powered | Measured with the OTP programmed to autonomously power the REGOUT LDO | 2.6 ms |
First Cell-1 measurement completed | Data from first measurement of Cell-1 can be read back | 3.2 ms |
INITCOMP, ADSCAN, and FULLSCAN asserted (5 series) | Measured with the OTP programmed to provide the INITCOMP and ADSCAN bits in the Alarm signal on the ALERT pin [CVADCSPEED1:0] = 0x0, [IADCSPEED1:0] = 0x0, [SSADCSPEED1:0] = 0x0 | 8.6 ms |
FETs enabled (5 series) | Measured with the OTP programmed to autonomously enable FETs. [CVADCSPEED1:0] = 0x0, [IADCSPEED1:0] = 0x0, [SSADCSPEED1:0] = 0x0 | 8.6 ms |
Figure 8-5 shows an example of an oscilloscope plot of a startup sequence with the device configured in OTP for a 5-series pack, with [FET_EN] = 1 for autonomous FET control and providing the [INITCOMP] flag on the ALERT pin. The TS pin is pulled up to initiate device wakeup from SHUTDOWN. The TS pin voltage is shown in blue; the DSG pin voltage is shown in green.