ZONRI AMC1301 Voltage Current Isolation Module ±5V ±5A 200KHz High Precision Analog Signal ISO

* Onboard SEPIC DC-DC converter supporting a wide power supply voltage range of 3.0V-9V DC.

* Minimum channel-to-channel isolation voltage: 2500V DC.

* Minimum input-to-output isolation voltage: 2500V DC.

* Typical output offset voltage: 4.8mV.

* ±5A to 0-5V or ±5V to 0-5V (Gain = 0.3979).

* External input reference voltage allows the reference level to be adjusted for different data acquisition systems.

* Supports acquisition of both positive and negative current/voltage signals.

* Typical analog bandwidth: 200kHz.

* 1 x AMC1301 Analog Signal Isolation Module

* 1 x 2.54mm 2x4 Pin Header

* 2 x SMA 180° Connectors

* 1 x KF128 Terminal Block

* Package weight: 0.25kg

Q: How do I configure the module to measure both positive and negative current signals using the STM32's internal ADC?

A: There are two options:

* Option 1: Apply a 1.65V reference voltage to the VREF interface, or modify the reference voltage divider resistors so that VREF is set to half the supply voltage. This provides the maximum linear measurement range for both positive and negative signals. See the module datasheet for details.

* Option 2: Replace U2 with a 3.3V LDO (the default configuration uses a 5V LDO).