The default I2C address is 0x48.
The ADC on the breakout requires between 2V to 5V power/logic, and can be easily used with most microcontrollers from an Arduino to a Feather or something else.
- VIN - this is the power pin. Acceptable voltages are 2V to 5V. To power the board, give it the same power as the logic level of your microcontroller - e.g. for a 5V micro like Arduino, use 5V.
- GND - common ground for power and logic
- SCL - I2C clock pin, connect to your microcontroller's I2C clock line. This pin has a 10K pullup to VIN
- SDA -I2C data pin, connect to your microcontroller's I2C data line. This pin has a 10K pullup to VIN.
- STEMMA QT - These connectors allow you to connect to development boards with STEMMA QT connectors, or to other things, with various associated accessories.
On the back of the board is one address jumper, labeled A0, below the I2C Addr label on the board silk. This jumper allows you to chain up to 2 of these boards on the same pair of I2C clock and data pins. To do so, you solder the jumper "closed" by connecting the two pads.
The default I2C address is 0x48. The other address options can be calculated by “adding” the A0 to the base of 0x48.
A0 sets the lowest bit with a value of 1. The final address is 0x48 + A0 which would be 0x49.
If A0 is soldered closed, the address is 0x48 + 1 = 0x49
The table below shows all possible addresses, and whether the pin(s) should be high (closed) or low (open).
- ADDR - I2C address selection pin.
The ADS11x5 chips have a base 7-bit I2C address of 0x48 (1001000) and a clever addressing scheme that allows four different addresses using just one address pin (named ADDR for ADdRess). To program the address, connect the address pin as follows:
- ALRT - Digital comparator output or conversion ready, can be set up and used for interrupt / asynchronous read.
- A+ and A- - ADC power supply (VIN through a ferrite) and ADC ground (digital GND through a ferrite) these are OUTPUTs not inputs!
- A0, A1, A2, A3 - ADC input pins for each channel.
- Power LED - In the upper left corner, above the STEMMA connector, on the front of the board, is the power LED, labeled on. It is the green LED.
- LED jumper - In the upper right corner on the back of the board is a jumper for the power LED. If you wish to disable the power LED, simply cut the trace on this jumper.