Battery and Voltage

The Coin Cell battery (CR2354) holds up the contents of the Battery-backed SRAM and the Real-time clock for at least 5 years. It is discussed in section CPU-Battery.

The voltage level of this battery can be read by the project.

In addition, a variable that is a flag will trip when the Battery is low, which occurs at 2.9 volts. Even in a low voltage condition, the battery will continue to support the Battery Backed SRAM for a few days after this flag goes active.

The variables are- byBatteryIsVoltageTooLow, uiBatteryCurrentVoltage.

Variable Access

To access these variables, install the device P2CDS622_SystemTags, by right-clicking on Device and Add Device > Miscellaneous.

Add this device and then connect to the P2CDS-622.

To access these variables you can assign them as Global Vars by naming the variable in the IO Mapping sections as shown below. Then access the variables as you see fit.

Alternatively, you can create a variable in your program/Application and assign that variable in the IO Mapping sections as shown below.