Kernel-3.10.0-957.el7_ads1015

ADS1015 (I2C)

This device is a 12-bit A-D converter with 4 inputs.

The inputs can be used single ended or in certain differential combinations.

For configuration all possible combinations are mapped to 8 channels:
0: Voltage over AIN0 and AIN1.
1: Voltage over AIN0 and AIN3.
2: Voltage over AIN1 and AIN3.
3: Voltage over AIN2 and AIN3.
4: Voltage over AIN0 and GND.
5: Voltage over AIN1 and GND.
6: Voltage over AIN2 and GND.
7: Voltage over AIN3 and GND.

Each channel can be configured individually:

• pga is the programmable gain amplifier (values are full scale)
  0: +/- 6.144 V
  1: +/- 4.096 V
  2: +/- 2.048 V (default)
  3: +/- 1.024 V
  4: +/- 0.512 V
  5: +/- 0.256 V
• data_rate in samples per second
  0: 128
  1: 250
  2: 490
  3: 920
  4: 1600 (default)
  5: 2400
  6: 3300

1. The /ads1015 node

   Required properties:

   • compatible : must be “ti,ads1015”
   • reg : I2C bus address of the device
   • #address-cells : must be <1>
   • #size-cells : must be <0>

   The node contains child nodes for each channel that the platform uses.

   Example ADS1015 node:

   ads1015@49 {

    compatible = "ti,ads1015";
    reg = <0x49>;
    #address-cells = <1>;
    #size-cells = <0>;
   
    [ child node definitions... ]
   

   }

2. channel nodes

   Required properties:

   • reg : the channel number

   Optional properties:

   • ti,gain : the programmable gain amplifier setting
   • ti,datarate : the converter data rate

   Example ADS1015 channel node:

   channel@4 {

    reg = <4>;
    ti,gain = <3>;
    ti,datarate = <5>;
   

   };