10.1.6 Connecting Multiple Devices

It is possible to connect up to four ADS111x devices to a single I²C bus using different address pin configurations for each device. Use the address pin to set the ADS111x to one of four different I²C addresses. Use the GND, VDD and SCL addresses first. If SDA is used as the device address, hold the SDA line low for at least 100 ns after the SCL line goes low to make sure the device decodes the address correctly during I²C communication. An example showing four ADS111x devices on the same I²C bus is shown in Figure 42. One set of pullup resistors is required per bus. The pullup resistor values may need to be lowered to compensate for the additional bus capacitance presented by multiple devices and increased line length.

NOINDENT:

NOTE: ADS111x power and input connections omitted for clarity. The ADDR pin selects the I²C address.

Figure 42. Connecting Multiple ADS111x Devices