9.3.2 DEF_1 Pin Function
The DEF_1 pin, dedicated to converter 1, makes the output voltage selection very flexible to support dynamic voltage management.
Depending on the device version, this pin works either as:
- Analog input for adjustable output voltage setting (TPS62400-Q1):
- Connecting an external resistor network to this pin adjusts the default output voltage to any value starting from 0.6 V to VIN.
- Digital input for fixed default output voltage selection (TPS62402-Q1 for example):
- Having this pin tied to a low level sets the output voltage according to the value in register REG_DEF_1_Low. The default voltage is 1.2 V. Having the pin tied to a high level sets the output voltage according to the value in register REG_DEF_1_High. The default value in this case is 1.8 V. The level of the DEF_1 pin selects between the two registers, REG_DEF_1_Low and REG_DEF_1_High, for the output-voltage setting. One can change the content of each register (and therefore output voltage) individually through the EasyScale interface. This makes the device very flexible in terms of output voltage setting; see Table 4.