USB5926CSLASHKD datasheet(32/66 Pages) MICROCHIP

32 / 66 page

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2022 Microchip Technology Inc. and its subsidiaries

DS00003190C-page 31

USB5926C

8.1.3

INTERNAL USB 3.1 GEN 1 MULTIPLEXER, “TYPE-C CONTROL MODE 2”

“Type-C Control Mode 2” is enabled by setting the

ALT_MUX_EN signal high. While in “Type-C Control Mode 2”, the

ATTACH_MUX[0:2]A and ATTACH_MUX[0:2]B pins are used to signal to the hub when a valid USB Type-C connec-

tion has been detected and in what orientation the connection has been detected. This functionality requires an external

USB Type-C controller (this mode not directly supported by UTC2000) to monitor the USB Type-C receptacle for a valid

attach. These signal are used to enable/disable the USB 3.1 Gen 1 PHYs appropriately according to the detected Type-

C attach and orientation. Unused USB 3.1 Gen 1 PHYs are disabled to conserve power.

The polarity of the

ATTACH_MUX[0:2]A pins and ATTACH_MUX[0:2]B are controlled by the CC_POL pin. See

Table 3-6 for details.

A diagram of a USB Type-C Downstream Facing Port with internal multiplexer operating in “Type-C Control Mode 2”

with the USB5926C is shown in Figure 8-4.

A diagram of a USB Type-C Upstream Facing Port with internal multiplexer operating in “Type-C Control Mode 2” with

the USB5926C is shown in Figure 8-5.

FIGURE 8-3:

UFP TYPE-C PORT WITH MICROCHIP UTC2000 & EXTERNAL MUX (MODE 1)

UTC2000

UFP Mode

USB Type-C

External Mux

Upstream Port

VBUS

SSTXA+

SSTXA-

SSRXA+

SS RXA-

SSTXB+

SSTXB-

SSRXB+

SS RXB-

D+

D-

CC1

CC2

CC1

CC2

CONNECTED#

MUX

VB US_DET

SS TX+

SS TX-

SS RX+

SS RX-

D+

D-

C_ATTACH0

CC_PO L

ALT_MUX_EN

SSTXA+

SSTXA-

SSRX A+

SSRX A-

SSTXB+

SSTXB-

SSRX B+

SSRX B-

SS TX+

SSTX-

SSRX+

SS RX-

USB Type-C

3.3V

PLUG_

ORIENTATION#

A/B

3.3V

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