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STCC5011, STCC5021

Application information

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5.1

Supported modes

For more information refer to Section 5.4: State machine.

The STCC5011/STCC5021 device supports the following modes:

•

SDP BC1.2

•

CDP BC1.2

•

SDP with remote wakeup for all USB devices

•

CDP with remote wakeup for low-speed USB devices with automatic transition to DCP

auto-mode if a full-speed/high-speed USB device attached or after a USB device

detached

•

DCP auto-detect: this mode permits auto-detection of charging modes between DCP

BC1.2 (shorted D+, D-) and divider charging mode. It also supports BlackBerry

charging mode and can charge legacy devices and Korean tablets.

•

Forced DCP BC1.2 mode

•

Forced DCP divider mode

The auto-detect mode starts in divider mode. If a charging negotiation attempt is detected,

pulse to initialize the proper BC1.2 handshake process. If the BC1.2 device is detached, the

circuit automatically returns to divider mode after a 10 s (typ.) timeout.

Note:

From the application point of view it means that after removing one device the user should

wait for approx. 15 s before attaching another device.

Selection between these modes is made through the CTLx control pins. The CTLx pins may

be controlled by the host in different ways:

•

GPIO from the embedded controller

•

Hardware signals from the USB host controller (SLP_S3#, SLP_S4#) and the

AC_adapter signal from the embedded controller

•

Hardware signal SUSPEND from the embedded controller and AC_ADAPTER.

Host state

CTL1 CTL2 CTL3

Mode description

0

0

0

Device off, output discharge

11

0

SDP

S0, S1, (S3)(2)

1

1

1

CDP BC1.2 with charging detection.

S3, (S0, S1)(2)

0

1

0

SDP with remote wakeup for all USB devices

S3

0

1

1

CDP with remote wakeup for low-speed USB devices / DCP auto-mode

for full-speed or high-speed USB devices or after a USB device detached.

S4, S5

0

0

1

DCP auto-detect mode without remote wakeup, with charging detection

S4, S5

1

0

1

Forced DCP divider mode with charging detection

S4, S5

1

0

0

Forced DCP BC1.2 mode with charging detection

1. On the transition from the CTLx = 111 to CTLx = 001, a synchronous transition of the CTL1 and CTL2 must be ensured.

2. See Section 5.2 for further information.