SLDS204B October 2014 – June 2020 PGA300
PRODUCTION DATA.
The OWI digital communication is a master-slave communication link in which the PGA300 operates as a slave device only. The master device controls when data transmission begins and ends. The slave device does not transmit data back to the master until commanded to do so by the master.
The PWR pin of the PGA300 is used as the OWI line, so that when the PGA300 is embedded inside a system module, only two pins are needed (PWR and GND) for communication. The OWI master communicates with the PGA300 by modulating the voltage on the PWR pin, whereas the PGA300 communicates with the master by modulating the current on the PWR pin. The OWI master activates OWI communication by generating an activation-pulse sequence on the PWR pin.
Figure 12 shows a functional equivalent circuit for the structure of the OWI circuitry.