Gravity: Analog Signal Isolator

In many cases, electrical isolation is required to ensure the reliable operation of sensors. Some

sensors

, such as pH sensors and conductivity sensors, will interfere with each other and do not measure properly in the same container when they connect to the same power. To ensure stable and reliable operation of the sensors with no interference, it is necessary to isolate the signal and the power.

The Gravity: Analog Signal Isolator is efficient in preventing electrical interference between sensors. This module has an onboard 5V isolation power which can directly supply to the sensor. Therefore, you do not need to prepare the external power, such an easy and practical solution! The connector wires are specially designed for DFRobot 3-pin analog sensors, plug and play with no need for soldering. The analog signal transmission ratio is 1:1, which contributes to a very small impact on the output signals of sensors when this module is connected to the circuit. Furthermore, you do not need to change the code of the mainboard.

This analog signal isolator is applicable to prevent interferences between sensors, such as a multi-parameter water quality monitoring system that need to prevent interferences between water sensors.

This product is compatible with most analog sensors produced by

DFRobot

. It can satisfy varied demands in situations that require electrical isolation.

• The MCU terminal (non-isolation terminal) should be provided with a precise voltage of 5.0±0.1V. The higher the precision of input voltage, the higher the precision of analog output signal
• This module consumes a relatively large current during operation, so it’s best to provide external power supply to your microcontroller to guarantee enough power and voltage precision
• Please pay attention to the operating current of your sensor or module, the maximum output current from SEN terminal is 170mA.
• The GND of the MCU terminal (non-isolation terminal) and the GND of SEN terminal (isolation terminal) are isolated from each other. Do not short circuit them
• It is normal for the isolator generates heat while working

Specifications

• Operating Voltage: 5.0V
• Response Time: 4 seconds (Typ)
• Analog Error between Two Terminals: <± 20mV (Typ)
• Connector Type: PH2.0-3P
• No-load Current: 75mA
• Dimension: 42 * 32mm / 1.65 * 1.26 inch
• Non-isolation Terminal (MCU Terminal)
• Supply Voltage: 5.0 ± 0.1V
• Analog Output: 0 ~ 5.0V
• Isolation Terminal (SEN Terminal)
• Output Voltage: 5.0 ± 0.2V
• Analog Input: 0 ~ 5.0V

Resources

• Wiki

• Schematic

• Layout

• Datasheet

Pinout

Num	Label	Description
1	A	Analog Siganl Output (0~5.0V)
2	+	Power Input VCC (5.0±0.1V)
3	–	Power Input GND
4	A	Isolation Power Output GND
5	–	Isolation Power Output VCC (5.0±0.2V)
6	A	Analog Signal Input (0~5.0V)

Package Contents

• 1x Gravity: Analog Signal Isolator
• 2x PH2.0 3-pin Cable