MSP430FR4133: More current consumption in custom board with LCD (SBLCDA4)

Sundar,

If identical code is resulting in different current consumptions for the LaunchPad and your custom board, then the likely culprit is something on the hardware side of things. Is your custom board an exact replication of the Launchpad or do you have additional circuitry around the MCU that may be drawing additional current?

-Matt

Hi Matt,

Thanks for the reply.

Yes. My hardware is exact replication of the launch pad. No additional circuit. I have attached the schematic of my custom board.

I just placed the crystal and capacitors. I fetch program using launchpad. I did not place the LDO, battery and switches. I power it up using launchpad and see the current mean as 50uA. Please review my schematic and help me to reduce the current.

Regards,

Sundar

mspv1.pdf 

Sundar,

I am not sure what is causing the larger current consumption but after comparing your provided schematic to the LaunchPad schematic I noticed that you are using a different LCD than the LaunchPad, which could lead to different power consumption performance than what our LaunchPad has.

In addition to this, you will want to make sure that any pins that are not being used on your device are set out output a high or low so that they are not floating. Recommendations for what to do with unused pins can be found in the device's datasheet. Any floating pins can lead to increased current consumption. If you are copying the example code for the LaunchPad to your custom board you will want to go through it with a fine tooth comb and make sure that any hardware differences between your board's MCU and the LP's MCU are taken into account.

Best regards,

Matt

Sundar,

I'm glad to hear you resolved your issue! Could you give a high level explanation of what the problem was with the first board design versus the second so that other customers can see what you fixed?

Best regards,

Matt