Max9924

Would anybody be able to offer some guidance on why a MAX9924 connected to an Arduino mega is giving out 5V constantly on the COUT pin, wiring is as follows:

Pin 1 (IN+) 10K --> Signal (red)
Pin 2 (IN-) 10K --> Signal (black)
Pin 3 (NC) No connect
Pin 4 (BIAS) Ground
Pin 5 (GND) Ground
Pin 6 (ZERO_EN)Ground
Pin 7 (COUT) 10K --> 5V pullup
Pin 8 (EXT) No connect
Pin 9 (INT_THRS)Ground
Pin 10 (VCC) 5V

I've run a scope around and everything and I've got about 0.3V on the IN+/IN- but my output (COUT) is just sat at 5V constantly.

Hoping someone can give me a steer in the right direction!

jseaman:
Pin 4 (BIAS) Ground

Datasheet:
"a well-decoupled externalresistor-divider generates a VCC/2 signal for the BIAS input that is used to reference all internal electronics in the device. BIAS should be bypassed with a 0.1μF and 10μF capacitor in parallel with the lower half of the resistor-divider forming a lowpass filter to provide a stable external BIAS reference"

Doesn't sound like something you would just wire to ground. Did you look at the application circuits in the data sheet, starting on page 15?

Hi,
Welcome to the forum.

Please read the post at the start of any forum , entitled "How to use this Forum".
OR
http://forum.arduino.cc/index.php/topic,148850.0.html.

Can you please post your code?

Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?

Have you googled?

max9924 arduino

Thanks.. Tom... :slight_smile: