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  • Author Author: Jan Cumps
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measure MSPM0 low power modes

Jan Cumps

In  advanced XDS110 debugger use with EasyL1105 MSPM0 board: EnergyTrace I used TI's EnergyTrace to get the power use of a low power EasyL1105 design. To get at the current use at real low power modes, I use the design without a debugger attached.

image

Low Power Firmware

The design is one of the SDK examples: sysctl_shutdown. I selected the controller and pins that are available on the EasyL1105:

SW1 PA17
CONFIG_0 PA6
CONFIG_1 PA5
USER_LED_1 PA14 (change to PA26 if you didn't mod the board) 
USER_LED_2 PA27
controller MSPM0L1105 VSSOP28

This code has 4 low power operation modes, based on what level the config pins are:

config input 0 config input 1 Power Policy Comment
High (default) High (default) SHUTDOWN wakes up from GPIO interrupt (SW1 from low to high)
High (default) Low (pin grounded) STOP0 always stays in this mode
Low (pin grounded) High (default) STANDBY0 always stays in this mode
Low (pin grounded) Low (pin grounded) RUN0SLEEP0 always stays in this mode

Measurements

These are the measurements, made with a Keithley DMM6500. Power is supplied by a Rigol DP832A.

All jumpers to the USB side disconnected, no pullups/-downs removed.

image

Lowest I managed to run the design, in SHUTDOWN, is 77 nA.

image

Code

You can find the sources in SDK example sysctl_shutdown. I don't attach the built firmware to this post, because your design will go into a mode where you can't just program/bootload it later. I attached the .syscfg file only, with specific changes for this board: sysctl_shutdown.zip. You can import the project in CCS via the New Project wizard, and replace the config file with the one I attached. 

Thank you for reading.

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