| A1 |
PIOA |
General-Purpose Input/Output A. |
VL |
Input/Output Open-Drain |
| A2 |
PIOB |
General-Purpose Input/Output B. |
VL |
Input/Output Open-Drain |
| A3 |
VL |
Voltage Low. This is the low-power supply input. Needed for IOB, PIOA, PIOB, and TOKEN pin operation. |
— |
Power |
| A4 |
IOA |
1-Wire Input/Output A. Accessible when the TOKEN pin is logic low. This pin can also be configured in a logic pass-through mode to IOB pin. IOA parasite power required for CD/PIOC pin operation. |
VPUPA or VL (PTM) |
Input/Output Open-Drain |
| B1 |
TOKEN |
Token. This pin indicates which 1-Wire side gets the communication token. Logic low stands for IOA side, while logic high for IOB side. It outputs a low-frequency clock (TOKF) while in pass-through mode. |
VL |
Output Open-Drain |
| B2 |
CD/PIOC |
Charger Disable (Default) or General-Purpose Input/Output (SEL bit is set to one). Charger disable is floating (i.e., non-conducting) when the IOA pin is nominally below 4V. Otherwise, charger disable is actively low to enable the charger through a transistor when IOA is above 4V. |
VPUPA |
Input/Output Open-Drain |
| B3 |
IOB |
1-Wire Input/Output B. This pin can also be configured in a logic pass-through mode to IOA pin. |
VL |
Input/Output Open-Drain |
| B4 |
GND |
Ground. |
— |
Ground |
