SLAU802 March 2019
A CR2032 battery holder is on the back of the LP-MSP430FR2476 board to power the LaunchPad development kit from a single coin battery. To power the LaunchPad kit from the CR2032 coin cell, insert the battery securely and in the correct orientation, and remove all of the shunt jumpers from J101 except the 3V3 jumper. Place the 3V3 jumper in the lower configuration to connect the battery output to the target side 3.3-V rail. This placement is also shown on the silkscreen on the PCB. Place a shunt jumper across J10. Alternatively, place an ammeter across the pins of J10 to measure current out of the battery.
Do not use the eZ-FET emulation circuit when the LP-MSP430FR2476 is powered from the CR2032 coin cell battery. Remove all of the shunt jumpers on J101 except the 3V3 (which is in the lower position) to disconnect the eZ-FET circuit from the target side of the LaunchPad development kit. The CR2032 voltage level will decrease with use and can cause voltage level violations on the eZ-FET portion of the design if left connected. To debug the target device, the LaunchPad development kit should be configured for eZ-FET USB Power as shown in Section 2.3.1
When not using the CR2032 battery to power the board, be sure the 3V3 shunt jumper on J101 is not placed in the battery configuration. It is also useful to remove the jumper from J10 to disconnect the battery from the rest of the power domains. This ensures there is no risk of applying an external voltage source to the battery.