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AD5241 (1MOhm) does not work

Question asked by lactobacillus on Feb 4, 2015
Latest reply on Dec 15, 2015 by prakash1164

I have 2 AD5241 (1MOhm) soldered by hand. The first one got maybe a bit hot but the second one should be fine.

 

A: 100kOhm --- GND

W: 3.3V

B: NC

VDD: 3.3V

SHDN: 3.3V

SCL: Master with pullup

SDA: Master with pullup

AD0: GND

AD1: GND

DGND: GND

VSS: GND

O2: NC

NC: NC

O1: NC

 

Transfered Data after slave address:

0x40 (or 0x58 for O1+O2)

0x00 (or 0xFF as test conditions)

The transfer from the Master should be correct (ACK was always sent and O1+O2 work as expected)

 

The problem ist the voltage drop between W and A. It is a bit above 1V in both test conditions for both AD5241.

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