MPR121 Set-up questions

[BobSa]

I am using the Adafruit MPR121 12-Key Capacitive Touch Sensor Breakout Board. It is working well with an Arduino Uno R3.

I am attempting to use this Breakout Board with a TI microcontroller, MSP430G2553.  I have established I2C communications with the Breakout Board.

However, I have not been able to determine answers to the following questions:

Assistance with these question, and any suggestions, would be greatly appreciated.

1. What is the correct sequence of registers to be written to initialize the MPR121?
2. Once the MPR121 has been initialized and is running, when power (VDD) is disconnected are the values written to the initialized registers retained? 

Thank you, Bob

[BobSa]

Hi Tomas,

Thanks for your reply, it's very helpful.

Is there a NXP replacement for the MPR121?

Thanks again, Bob

[TomasVaverka]

Hi Bob,

Unfortunately, there is no replacement for the MPR121 in our portfolio.

We offer software libraries and tools to complement our IEC 61000-4-6 certified and low-cost, capacitive touch solutions for the KE series and LPC804 MCUs:

https://www.nxp.com/design/software/development-software/mcuxpresso-software-and-tools-/touch-sensin...

Best regards,

Tomas

[BobSa]

Hi Tomas,

I'll take a look at the capacitive touch solutions for the KE series and LPC804 MCUs.

Thanks, Bob

[TomasVaverka · Accepted solution]

Hi Bob,

First, let me inform you that the MPR121 is no longer manufactured and supported by NXP.

However, in the attached document you can find the sample code for MPR121 initialization and configuration (pages 15-17).

No, the values written to the initialized registers are not retained when power is disconnected.

Best regards,

Tomas