- Tue Dec 16, 2008 10:09 pm
#61527
Hi, I've been working with the ez430-RF2500 boards and so far everything is OK with the programming. I was trying to get the ADC input to work with an analog accelerometer. My code was tested to be fine with a variable voltage source to fake the input. But when I connect the accelerometer output (0 - 3.0V), it only reads in 0.0V. I think there is something to do with the input impedance of MSP430 chip. But I can't find it any where except this document:
http://focus.ti.com/lit/ml/slap123/slap123.pdf
says the Ri is about 2kohm. The accelerometer output is hooked up to a 1kohm and 0.1 uf filter. I am not sure if I need to add a high impedance in parallel with the output.
I hope someone can help, thanks.
http://focus.ti.com/lit/ml/slap123/slap123.pdf
says the Ri is about 2kohm. The accelerometer output is hooked up to a 1kohm and 0.1 uf filter. I am not sure if I need to add a high impedance in parallel with the output.
I hope someone can help, thanks.