7.6

VCONN OCP

•

At start-up, a soft start sets the tripping current to about 590 mA during 512 µs min. (1ms max.)

•

After this delay, the soft start is ended and the normal OCP threshold occurs (50 mA).

•

If an OCP event occurs:

–

VCONN switches, CC switches and gate drivers are shutting down

–

During up to 40 µs typical, this OCP alarm is held (no recovery is possible)

–

After this delay, CC switches are turned ON but VCONN switches and gate drivers are held OFF. The

system can be restarted only with a recovery word send by the MCU via the I2C bus.

–

The FLGn signal stays low as long as the recovery word has not been sent

Figure 10. VCONN OCP chronograms

ALARM HOLDING

OCP switch open

System OFF

Soft start

SYSTEM ON

NORMAL

SYSTEM ON

Over current

VCONN current

Inrush current

512 µs (typ.)

VCONN switch

ON

OFF

State

ALARM HOLDING

OCP switch open

System is waiting recovery word (CC switches ON)

up to 40 µs typ

OCP threshold is set to 590 mA OCP threshold is set to 47mA typ.

To recover, the below bit sequence has to be written and after recovery, the user can resume a start-up

procedure:

Table 14. VBUS OCP recovery bit sequence table

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0

0

PM2

PM1

1

0

0

0

7.7

VCONN CC line OVP

7.7.1

CC lines short to VBUS

USB Type-C™ standard specifies a pitch of 0.5 mm between connector pins (see figure 3-1 USB Type-C™

receptacle interface dimensions in USB Type-C cable and connector specification).

VBUS pin being adjacent to the CC pins, when removing the USB Type-C™ plug from the connector, VBUS can

be shorted to CC lines and apply a voltage higher than specified for CC lines.

Over voltage protection is needed on the CC lines because VBUS typical voltage can be as high as 20 V when

CC pins are usually 5 V tolerant I/Os on low voltage USB-PHY controllers.

TCPP02-M18 integrate this protection against CC lines short to VBUS thanks to an overvoltage protection

(integrated FET).

When the voltage on the CC line goes above VTH_CC, the OVP on CC line turns-on in less than 60ns (TOVP_CC

typical value) and FLGn pin goes to '0' state.

When the OVP event disappears, the OVP on the CC line is turned-off and the FLGn pin goes back to 'Hi-Z' state.

TCPP02-M18

VCONN OCP

DS13787 - Rev 4

page 15/27