6
Quick Start Guide
TWR-K40D100M Jumper Options
The following is a list of all jumper options. The default installed jumper settings are
shown in shaded boxes.
Jumper Option
Setting Description
J10
V_BRD Voltage
Selection
1-2
Onboard power supply set to 3.3 V
2-3
Onboard power supply set to 1.8 V
(Some onboard peripherals may not operate)
J13
MCU Power
Connection
ON
Connect MCU to onboard power supply (V_BRD)
OFF
Isolate MCU from power (Connect to ammeter to
measure current)
J9
VBAT Power
Selection
1-2
Connect VBAT to onboard power supply
2-3
Connect VBAT to the higher voltage between
onboard power supply or coin-cell supply
