UPD360 datasheet(78/221 Pages) MICROCHIP

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UPD360

DS00002084C-page 78

 2016-2017 Microchip Technology Inc.

Upon powering the host CPU, software simultaneously deasserts EN_RD_DB and asserts EN_RD_TRIM. Going for-

ward the device presents RD_TRIM.

The Rd resistor presented, trimmed or untrimmed, is controlled by the CC1 Pull-Down Value and CC2 Pull-Down Value

in the CC Control Register (CC_CTL). These register fields serve the basis for the EN_RD_TRIM and EN_RD_DB_N

control signals depicted.

9.7

VCONN Operation

VCONN is a 5V supply that is used to power circuitry in the USB Type-C plug, which is required to implement Electron-

ically Marked Cables. By default, the DFP always sources VCONN when connected to an active cable. However, this

may be changed by software by using PD VCONN_SWAP.

The VCONN FETs are enabled/disabled by software via the VCONN1 Control and VCONN2 Control control bits in the

CC Control Register (CC_CTL).

In standalone DFP mode, the device independently enables/disables the VCONN FETs. This mode is intended for con-

figurations where no host CPU is available or the CPU is not capable of managing VCONN. The Standalone Operation

bit in the CC Hardware Control Register (CC_HW_CTL) enables this mode of operation.

APPLICATION NOTE: It is not envisioned to ever enable both FETs simultaneously.

VCONN is monitored for an over current condition via an internal monitoring circuit. A VCONN over current condition is

recognized when the event persists for a time longer than specified in the VCONN OCS and Back-Drive Debounce Reg-

ister (VCONN_DEB). VCONN OCS monitoring is enabled via the VCONN OCS Enable bit in the VBUS Control Register

(VBUS_CTL).

When an over-current VCONN event is detected, the VCONN Discharge Error (VCONN_DISCH_ERR) interrupt in the

Power Interrupt Status Register (PWR_INT_STS) asserts. The device may be configured to automatically disable the

VCONN FET upon detection of a CC1 Back-Drive Error/CC2 Back-Drive Error or VCONN Discharge Error (VCONN_-

DISCH_ERR). In the event of the detection of a debounced over-current VCONN event, the enabled VCONN FET will

be disabled. The OCS event also results in an automatic disablement of the respective VCONN1 Control and VCONN2

Control control bits in the CC Control Register (CC_CTL).

9.7.1

VCONN DISCHARGE PROGRAMMING MODEL

Software may use the following programming model for implementing VCONN discharge when the device is operating

as a DFP and a UFP disconnect has been detected.

This section does not apply to standalone DFP operation.

Software determines the attached UFP has disconnected and disconnects the VCONN FET.

Software disables monitoring the CC thresholds corresponding to the attached CC pin.

FIGURE 9-2:

CC RD (TRIM)

CCx

CC_DB_ENx

EN_RD_DB_N

EN_RD_TRIM

50 M

RD_DB

5.1 K

RD_TRIM

5.1 K

UFP

DFP

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