2.4.3

Thermal Protection

The PD70211 device is protected from the excessive internal temperatures that might occur during various operating

procedures. The following two temperature sensors are located on the chip monitor temperatures.

• Isolating switch (pass-FET)

• Classification current sink

Each of the given temperature sensors activates a protection mechanism that disconnects the Isolation (pass) FET or

the classification circuit, respectively. This action protects the device from being permanently damaged or even from

long-term degradation.

2.4.4

Wall Adapter Mode

The PD70211 device supports wall adapter functionality. That is, by setting WA_EN pin high, it gives priority to the

wall adapter jack to supply the load.

The WA_EN pin is used while connecting a wall adapter voltage between VPP and VPN_OUT by means of an OR-

ing diode.

While WA_EN, the wall adapter enable pin, is held low (referenced to VPN_IN), the front-end works as a normal PD.

When WA_EN pin is raised high (referenced to VPN_IN), the following three internal operations are forced:

• The Isolation FET is turned OFF.

• All output flags, like AT_FLAG, HD_FLAG, 4P_AT_FLAG, and 4P_HD_FLAG are activated (low state).

While activating the WA_EN pin, the wall adapter supplies the input voltage for the DC-DC converter. Having WA_EN

pin at high state does not disable detection and classification modes.

PD70211

Electrical Specifications

Datasheet

DS00003672A-page 15