The ball assignment figure and table describe the assignments for the chip.
Figure 1. WLCSP ball assignments, top view
| Pin | Name | Function | Description |
|---|---|---|---|
| A1 | VIN_BUCK2 | Power | Input supply for BUCK2 |
| A2 | SW2 | Power | BUCK2 regulator output (to inductor) |
| A3 | AVSS1_2 | Power | Ground (BUCK1 and BUCK2) |
| A4 | SW1 | Power | BUCK1 regulator output (to inductor) |
| A5 | VIN_BUCK1 | Power | Input supply for BUCK1 |
| B1 | VO2 | Power | BUCK2 regulator output |
| B2 | ENABLE | Digital IN | Enable input |
| B3 | RESERVED | Reserved | Connect to ground |
| B4 | RESERVED | Reserved | Do not connect |
| B5 | VO1 | Power | BUCK1 regulator output |
| C1 | VIN_LDO0 | Power | Input supply for LDO0 |
| C2 | GPIO0 | Digital I/O | General purpose input/output pin |
| C3 | RESERVED | Reserved | Connect to VO0 |
| C4 | VDD_TWI | Power | Input supply for TWI |
| C5 | VLDO1 | Power | LDO1 regulator output |
| D1 | VLDO0 | Power | LDO0 regulator output |
| D2 | GPIO2 | Digital I/O | General purpose input/output pin |
| D3 | GPIO1 | Digital I/O | General purpose input/output pin |
| D4 | nINT | Digital OUT | Open-drain Interrupt output, active low |
| D5 | VIN_LDO1 | Power | Input supply for LDO1 |
| E1 | VIN_GPIO | Power | Input supply for general purpose pins |
| E2 | SDA | Digital I/O | TWI data input/output |
| E3 | SCL | Digital IN | TWI clock input |
| E4 | RESERVED | Reserved | Do not connect |
| E5 | RESERVED | Reserved | Connect to ground |
| F1 | AVSS | Power | Ground |
| F2 | AVSS_ANA | Power | Ground |
| F3 | VIN_ANA | Power | Input supply |
| F4 | RESERVED | Reserved | Connect to ground |
| F5 | BUCK_MODE1 | Digital IN | BUCK operating mode control input |
| G1 | VIN | Power | Input supply |
| G2 | BUCK_MODE0 | Digital IN | BUCK operating mode control input |
| G3 | RESERVED | Reserved | Connect to ground |
| G4 | BUCK_MODE2 | Digital IN | BUCK operating mode control input |
| G5 | VO0_IN | Power | Input supply for the control inputs and outputs |
| H1 | VO3 | Power | BUCK3 regulator output |
| H2 | RESERVED | Reserved | Connect to ground |
| H3 | AVSS0 | Power | Ground (BUCK0) |
| H4 | READY | Digital OUT | Open-drain Ready output, active high |
| H5 | VO0 | Power | BUCK0 regulator output |
| J1 | VIN_BUCK3 | Power | Input supply for BUCK3 |
| J2 | SW3 | Power | BUCK3 regulator output (to inductor) |
| J3 | AVSS3 | Power | Ground (BUCK3) |
| J4 | SW0 | Power | BUCK0 regulator output (to inductor) |
| J5 | VIN_BUCK0 | Power | Input supply for BUCK0 |