Hi,
I'm having problems getting the ADN8831 to work. My design intent is to have three of drivers controlling 3 separate thermal bodies. My schematic is attached - although it shows the P channel FETs mirrored and i've actually corrected this and i'm still having problems. First of all, SS/!SB is measuring 2.5v, even when I added a 10k pull-up resistor Also Vref is measuring 4.5v instead of 2.5v. I see a few things I can improve from searching these forums, like separating the ground planes. I don't see how any of that could cause wacky voltages that i'm seeing.
I've measured voltage in all pins:
1: 3.72v
2: 2.28v
3: 1.5v
4: 0.2v
5: 1.9v
6: 0.2v
7:4.69v
8: 4.59v
9: 5.08v
10: 1.7v
11: 0.2v
12: 0v
13: 0v
14: 0.23v
15: 0.1v
16: 4.932v
17: 5.08v
18: 5.08v
19: 4.7v
20: 1.4v (jumps between 1.4 and 1.6)
21: 0.19v
22: 0v
23: 1.4v (jumps between 1.4 and 1.6)
24: 4.72v
25: 2.65v
26: 4.715v
27: 0v
28: 0v
29: 4.7v
30: 0.9v
31: 2.29v
32: 0.86v
