DocID024781 Rev 1

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AN4308

Application dependent CTLx controlling options

14

2.3

CTLx pins controlled by signals SUSPEND and

AC_ADAPTER

In this case, the charging modes are enabled only when the system is powered from AC

adapter.

The drawback of this solution is that it doesn't support remote wakeup in the S3.

Another way may be to use a GPIO from EC to control the CTL2.

The device can be powered on/off using the EN pin.

Table 6. SUSPEND and AC_ADAPTER control truth table

Power state

CTL1 = CTL2 = SUSPEND

CTL3 = AC_ADAPTER

Mode

S0

1

0

SDP

S0

1

1

CDP

S3/S4/S5

0

1

DCP auto

S3/S4/S5

0

0

OFF

Table 7. SUSPEND, AC_ADAPTER and GPIO control truth table

Power state CTL1 = SUSPEND CTL2 = GPIO

CTL3 =

AC_ADAPTER

Mode

S0

1

1

0

SDP

S0

1

1

1

CDP

S3

0

1

0

SDP

S3

0

1

1

LS devices: remote wakeup.

FS, HS devices: DCP auto.

S4/S5

0

0

1

DCP auto

S4/S5

0

0

0

OFF

b. Internal pull-up on the CTL3 is a metal option, not implemented in current versions of STCCxxxx devices.

Table 8. SUSPEND and GPIO control truth table

Power state

CTL1 =

SUSPEND

CTL2 = GPIO

CTL3 pull-up

Mode

S0

1

1

1

CDP

S3

0

1

1

LS devices: remote wakeup.

FS, HS devices: DCP auto.

S4/S5

0

0

1

DCP auto