#53, M2S: Isolated 4-20mA ADC
Function: Isolated 4-20mA ADC
Form factor: M2T
Category: Input module
Special needs: --- (isolated +/-15V power is generated internally)
Power requirements: 5V/100mA
See also: #13, #31, #43-1, #43-2, #52
Details
This analog-to-digital converter (ADC) Tibbit uses an RCV420 current loop receiver front end and an ADC1100 16-bit analog-to-digital converter IC. To lower noise and improve resolution, this Tibbit has its own isolated power domain.
The full-scale conversion error for this Tibbit does not exceed 2%, and the effective flicker-free resolution is 15 bits.
Combine this Tibbit with #21 (four terminal blocks), #20 (nine terminal blocks) or #19 (DB9M connector). It's possible, but not common, to use the latter for wiring into the meter's inputs.
LEDs
There is one red and one yellow LED. The red LED is connected to the SCL line of the I²C interface, while the yellow LED is connected to the SDA line.
Sample Project
The use of Tibbit #53 is illustrated by a Tibbo BASIC test project. You can find it here: https://github.com/tibbotech/CA-Test-Tibbit-53.