UPD360 datasheet(70/221 Pages) MICROCHIP

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UPD360

DS00002084C-page 70

 2016-2017 Microchip Technology Inc.

• CC_THR5 (DFP_UFP_1A5)

The value programmed into CCx Debounce Clear Enable Registers (CCx_DBCLR_EN) and CCx Match Enable Regis-

ters (CCx_MATCH_EN) would therefore be 0x22.

Since the vRd is less than 0.35V no threshold matches would be detected on CCx Match Registers (CCx_MATCH) or

CCx Change Status Registers (CCx_CHG_STS).

DFP: Advertise 3.0 A and connected to UFP

In this scenario the DFP is advertising 3.0 A and connected to a UFP. The vRd value measured will be > 0.85V and <

2.45V.

In this configuration the following thresholds are enabled for matching:

• CC_THR3 (DFP_ACT_3A0)

• CC_THR6 (DFP_UFP_3A0)

The value programmed into CCx Debounce Clear Enable Registers (CCx_DBCLR_EN) and CCx Match Enable Regis-

ters (CCx_MATCH_EN) would therefore be 0x44.

In this case only CC_THR3 would be matched. Bit 3 would be set in both CCx Match Registers (CCx_MATCH) or CCx

Change Status Registers (CCx_CHG_STS) after the debounce interval.

UFP: Connected to DFP advertising 3.0 A

In this case the UFP is connected to a DFP advertising 3.0A. The vRd value measured will be > 1.3V and < 2.04 V.

In this configuration the following thresholds are enabled for matching:

• UFP_DFP_DEF (CC_THR0)

• UFP_DFP_1A5 (CC_THR2)

• UFP_DFP_3A0 (CC_THR4)

The value programmed into CCx Debounce Clear Enable Registers (CCx_DBCLR_EN) and CCx Match Enable Regis-

ters (CCx_MATCH_EN) would therefore be 0x15.

In this case all three thresholds would be matched since the value of vRd must exceed CC_THR4 which is 1.23V. Bits

0, 2 and 4 would be set in both CCx Match Registers (CCx_MATCH) or CCx Change Status Registers (CCx_CH-

G_STS).

9.2

DFP Operation

The device implements current sources to advertise current charging capabilities on both CC pins when operating as a

DFP.

When a UFP connection is established, the current driven across the CC pins creates a voltage across the UFP’s Rd

pull-down that can be detected by the integrated CC comparator. The voltages monitored are summarized in Table 9-

4. When connected to an active cable, an alternative pull-down (Ra) appears on the CC pin.

The DFP may provide the advertised VBUS power via the integrated Port Power Controller (PPC).

The DFP also integrates two 5V FETs for implementing the VCONN function. This is further discussed in Section 9.7,

"VCONN Operation".

TABLE 9-4:

SOURCE DETECTION

CC1

CC2

Connection State

CC Comparator State

VBUS

VCONN

Open

Nothing Attached

Monitor both CC pins for attach

Off

Open

UFP Attached

Monitor CC1 for detach

Off

Open

UFP Attached

Monitor CC2 for detach

Off

Open

Powered Cable, No UFP attached

Monitor CC2 for UFP attach.

Monitor CC1 for cable detach.

Off

Open

Powered Cable, No UFP attached

Monitor CC1 for UFP attach.

Monitor CC2 for cable detach.

Off

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