SLDS231 August 2018 PGA305
PRODUCTION DATA.
The OWI digital communication is a master-slave communication link in which the PGA305 device 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 it is commanded to do so by the master.
The PWR pin of PGA305 device is used as OWI interface, so that when the PGA305 device is embedded inside of a system module, only two pins are needed (PWR and GND) for communication. The OWI master communicates with the PGA305 device by modulating the voltage on the PWR pin, whereas the PGA305 device communicates with the master by modulating the current on the PWR pin. The OWI master activates OWI communication by generating an activation pulse on the PWR pin.
Figure 7 shows a functional equivalent circuit for the structure of the OWI circuitry.