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Hardware
2.3.7.2 Light Sensor
A light sensor circuit is provided on the EVM by using the photodiode in configuration shown in
jumper connections between this circuit and the MSPM0 are populated by default so the photodiode is in circuit.
The jumpers can be removed to place the photodiode out of circuit so the MSPM0 connections can be used for
other evaluation purposes.
This circuit is intended to be used with the internal OPA of the MSPM0 in an transimpedance configuration
to drive the circuit. The OPA output is internally set to an ADC channel for sampling. See
device-specific module connections and
2.4 Power
The board accommodates various powering methods, including through the onboard XDS110-ET as well as
external or BoosterPack plug-in module power.
2.4.1 XDS110-ET USB Power
The most common power-supply scenario is from USB through the XDS110-ET debugger. This provides 5-V
power from the USB and also regulates this power rail to 3.3 V for XDS110-ET operation and 3.3 V to the target
side of the LaunchPad development kit. Power from the XDS110-ET is controlled by jumper J101. For 3.3 V,
make sure that a jumper is connected across the J101 3V3 terminal.
2.5 External Power Supply and BoosterPack Plug-in Module
Header J7 is present on the board to supply external power directly. To comply with the device voltage operation
specifications when supplying external power is important. The MSPM0L1306 has an operating range of 1.62 V
to 3.6 V. More information can be found in the MSPM0L1306 data sheet.
2.6 Measure Current Draw of the MSPM0 MCU
To measure the current draw of the MSPM0L1306 MCU using a multimeter, use the 3V3 jumper on the J101
jumper isolation block. The current measured includes the target device, launchpad circuits, and any current
drawn through the BoosterPack plug-in module headers.
To measure ultra-low power, follow these steps:
1. Remove the 3V3 jumper in the J101 isolation block, and attach an ammeter across this jumper.
2. Consider the effect that the backchannel UART and any circuitry attached to the MSPM0L1306 can have on
the current draw. Consider disconnecting these at the isolation jumper block, or at least consider the current
sinking and sourcing capability in the final measurement.
3. Make sure there are no floating inputs/outputs (I/Os) on the MSPM0L1306. This causes unnecessary extra
current draw. Every I/O either be driven out or, if the I/O is an input, needs to be pulled or driven to a high or
low level.
4. Begin target execution.
12
MSPM0L1306 LaunchPad Development Kit (LP
Figure 2-8. Light Sensor Circuit
Section 3
for example code.
‑ MSPM0L1306)
Copyright © 2023 Texas Instruments Incorporated
Figure
Table 2-1
SLAU869D – OCTOBER 2022 – REVISED NOVEMBER 2023
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2-8. The
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