9.1.6 Connecting Multiple Devices

It is possible to connect up to four ADS101x devices to a single I²C bus using different address pin configurations for each device. Use the address pin to set the ADS101x 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 ADS101x devices on the same I²C bus is shown in Figure 27. 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: ADS101x power and input connections omitted for clarity. The ADDR pin selects the I²C address.

Figure 27. Connecting Multiple ADS101x Devices