TMAG5173-Q1: I can't get the sensor to trigger using the INT line and have it pulse the SCL line when the conversion is complete.

Tim Hickenlooper

Part Number: TMAG5173-Q1
Other Parts Discussed in Thread: MSP430FR2422

I am using an MSP430FR2422 processor and have a prototype PCB with the sensor, processor, and JTAG emulator. I can get readings using the I2C to trigger the conversion and the sensor to indicate a conversion complete with the INT, but an unable to change the operating mode to use the INT to trigger (and wake-up) and SCL pulse to indicate a conversion complete.

I change the DeviceConfig2 register from 0x00 to 0x04, and the INTConfig register from 0xA4 to 0x91, as well as the GPIO pins on the processor. A scope trace shows good readings when using the I2C to trigger a conversion, but when using the INT to trigger a conversion, the sensor never responds with a pulse on the SCL line.

Hopefully this makes sense, and there is a simple answer.

3 months ago

0 Alicia Rosenberger 3 months ago

TI__Expert 8055 points

Hi Tim,

Thank you for posting to the Sensors forum!

You'll need to make sure that the MASK_INB pin bit is set to 0h so that the INT pin is enabled.

Best,

~Alicia

0 Tim Hickenlooper 3 months ago in reply to Alicia Rosenberger

Prodigy 30 points

Hi Alicia,

Thanks for the reply - good catch (the data sheet tricked me)...however, the sensor still doesn't reply to a trigger on the INT (20 us pulse), so I still have something else setup wrong. The system is working in the other mode (I thought that the INT trigger mode could save some power), so I'm going to finish working on some other requirements at this time and then come back to this later.

Thanks,

Tim