Figure 9. Typical chronograms of TCPP02-M18 VBUS OCP

ALARM HOLDING

OCP switch open

System OFF

NORMAL

SYSTEM ON

Gate driver

ON

OFF

TCPP

ALARM HOLDING

System is waiting recovery word

up to 40 us

OCP switch closed

Over current

VBUS current

Note:

•

In case of VBUS OCP event, the TCPP02-M18 switches OFF all active functions except CC switches:

–

VCONN switches

–

VBUS gate driver

–

VCONN and VBUS discharge paths are activated

•

It is signaled to the user by several ways:

–

I2C corresponding state bits are cleared (i.e. VCONN1_ACK = 0, VCONN2_ACK = 0…)

–

I2C relevant OCP flag is set (FLGn_OCP_VBUS is the OCP event coming from VBUS switch for

example)

–

Failure flag pin (FLGn) is active (i.e. in LowZ state)

•

After a delay of up to 40 µs, to recover, the below bit sequence has to be written and after recovery, the

user can resume a start-up procedure:

Table 13. VBUS OCP recovery bit sequence table

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0

0

PM2

PM1

1

0

0

0

TCPP02-M18

VBUS analog current measurement and OCP

DS13787 - Rev 4

page 14/27