JAJSOZ4A June 2023 – June 2024 TPS6521905
PRODUCTION DATA
This section describes the external connections required for the digital pins. A VIO supply of 3.3V or 1.8V supply is commonly used as the voltage level for the digital signals that require an external pull-up. However, higher voltage can be used (up to the maximum spec). The VIO supply for the digital pins on the PMIC must be the same as the IO domain for the digital signal that is connected to on the processor. 100 kΩ is the recommended pull-up resistor for EN/PB/VSENSE. Pull-up resistor for I2C pins can be calculated based on system requirements. All other digital pins can use 10 kΩ.
If GPIO, GPO1 or GPO2 is assigned to the first slot of the power-up sequence to enable an external discrete, they can be pulled up to VSYS.
The EN/PB/VSENSE pin can be driven externally to enable or disable the PMIC. However, if the application does not have an external signal dedicated to drive this pin, it can be pulled up to VSYS.
Digital Pin | External Connection |
---|---|
nINT | Open-drain output. Requires external pull-up. |
nRSTOUT | Open-drain output. Requires external pull-up. |
EN/PB/VSENSE | When configured as EN, this signal can be driven by external
logic to enable or disable the PMIC. When configured as PB, this signal requires a pull-up resistor connected to the VSYS pin. Push-button is optional. When configured as VSENSE, this signal requires an external resistor divider to monitor the pre-regulator. |
SDA | I2C clock signal. Requires external pull-up. |
SCL | I2C data signal. Requires external pull-up. |
GPIO | When configured as GPIO (for multi-PMIC), this pin shares the
external pull-up resistor with the second TPS6521905 PMIC. When configured as GPO (for single PMIC), requires external pull-up. |
GPO1 | Open-drain general purpose output. Requires external pull-up. |
GPO2 | Open-drain general purpose output. Requires external pull-up. |
VSEL_SD / VSEL_DDR | Input digital pin. The initial state (pull-up or pull-down) must be set before the assigned PMIC rail ramps up. For example, if this pin is used to set the voltage on LDO1, the state must be set before LDO1 powers up. |
MODE / STBY | Input digital pin. The initial state (pull-up or pull-down) must be set before the power-up sequence is complete. |
MODE / RESET | Input digital pin. The initial state (pull-up or pull-down) must be set before the power-up sequence is complete. |