The REG1 LDO in the BQ76922 device is for customer use, and its output voltage can be programmed to 1.8V, 2.5V, 3.0V, 3.3V, or 5.0V. The REG1 LDO and the REG0 preregulator are enabled by default in the BQ76922 device, with the REG1 voltage set to 3.3V. While in SHUTDOWN mode, the REG1 pin has a approximately10MΩ resistance to VSS, to discharge any output capacitance. While in other power modes, when REG1 is powered down, it is pulled to VSS with an internal resistance of approximately 2.5kΩ. If REG1 is configured to be powered down at initial device power up, and if pullup resistors for serial communications are connected to the REG1 voltage output, the REG1 voltage can be overdriven from an external voltage supply on the manufacturing line, to allow communications with the device. The BQ76922 device can then be programmed to enable REG0 and REG1 with the desired configuration, and this setting can be programmed into OTP memory. Thus, at each later power-up, the device will autonomously load the OTP settings and enable the LDO as configured, without requiring communications first. This will generally not be necessary with the BQ76922 due to the REG1 LDO already preprogrammed by Texas Instruments to be enabled and set to 3.3V in the OTP.