ZHCSJZ9B june 2019 – august 2023 BQ25155
PRODUCTION DATA
The BQ25155 offers the option to control PMID through the I2C PMID_MODE bits. These bits can force PMID to be supplied by BAT instead of IN, even if VIN > VBAT + VSLP . They can also disconnect PMID, pulling it down or leaving it floating. Table 9-4 shows the expected device behavior based on the PMID_MODE setting as detailed in Table 9-4 below.
| PMID_MODE | DESCRIPTION | PMID SUPPLY | PMID PULL-DOWN |
|---|---|---|---|
| 00 | Normal Operation | IN or BAT | Off |
| 01 | Force BAT Power | BAT | Off |
| 10 | PMID Off - Floating | None | Off |
| 11 | PMID Off - Pulled Down | None | On |
PMID_MODE = 00
This is the default state/normal operation of the device. PMID will be powered from IN if VIN is valid or it will be powered by BAT. PMID will only be disconnected from IN or BAT and pulled down when a HW Reset occurs or the device goes into Ship Mode.
PMID_MODE = 01
When this configuration is set, PMID will be powered by BAT if VBAT >VBATUVLO regardless of VIN or CE state. This allows the host to minimize the current draw from the adapter while it is still connected to the system. If PMID_MODE = 01 is set while VBAT < VBATUVLO, the PMID_MODE = 01 setting will be ignored and the device will go to PMID_MODE = 00. If VBAT drops below VBATUVLO while PMID_MODE = 01 the device will automatically switch to PMID_MODE=00. This prevents the device from needing a POR in order to restore power to the system and allow battery charging. If PMID_MODE = 01 is set during charging, charging will be stopped and the battery will start to provide power to PMID as needed.
PMID_MODE = 10
When this configuration is set, PMID will be disconnected from the supply (IN or BAT) and left floating. VDD and the digital remain on and active. The LDO will be disabled. When floating, PMID can only be forced to a voltage up to VBAT level. Note that this mode can only be exited through I2C or MR HW Reset.
PMID_MODE = 11
When this configuration is set, PMID will be disconnected from the supply (IN or BAT)and pulled down to ground. VDD and the digital remain on and active. The LDO will be disabled. Note that this mode can only be exited through I2C or MR HW Reset.