USB3320 datasheet(47/70 Pages) MICROCHIP

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 2014-2015 Microchip Technology Inc.

DS00001792B-page 47

USB3320

After the CarkitMode bit is set, the ULPI interface will become redefined as described in Table 6-8, and the USB3320

will transmit data through the DATA[0] to DM of the USB connector and receive data on DP and pass the information

the Link on DATA[1].

When entering UART mode, the regulator output will automatically switch to the value configured by the UART RegOut-

put bits in the

USB IO & Power Management register and a pull-up will be applied internally to DP and DM. This will hold

the UART in its default operating state.

While in UART mode, the transmit edge rates can be set to either the Full Speed USB or Low Speed USB edge rates

by using the XcvrSelect[1:0] bits in the Function Control register.

6.5.2

USB AUDIO MODE

When the USB3320 is powered in Synchronous Mode, the Audio switches can be enabled by asserting the SpkLeftEn,

or SpkRightEn bits in the Carkit Control register. After the register write is complete, the USB3320 will immediately

enable or disable the audio switch. Then the Link can set the CarkitMode bit in the Interface Control register. The

SpkLeftEn

, or SpkRightEn bits must be written before the CarkitMode bit.

After the CarkitMode bit is set, the ULPI interface will become redefined as described in Table 6-8.

6.6

RID Converter Operation

The RID converter is designed to read the value of the ID resistance to ground and report back its value through the

ULPI interface.

When a resistor to ground is applied to the ID pin the state of the IdGnd comparator will change from a 1 to a 0 as

described in Section 5.6.1. If the USB3320 is in ULPI mode, an RXCMD will be generated with bit 6 low. If the USB3320

is in Low Power Mode (or one of the other non-ULPI modes), the DATA[3] interrupt signal will go high.

TABLE 6-7:

ULPI REGISTER PROGRAMMING EXAMPLE TO ENTER UART MODE

R/W

Address

(HEX)

Value

(HEX)

Description

Result

Configure Non-Driving mode

Select FS transmit edge rates

OpMode

=01

XcvrSelect

=01

Set regulator to 3.3V

UART RegOutput

=00

Enable UART connections

RxdEn

TxdEn

Enable carkit mode

CarkitMode

TABLE 6-8:

PIN DEFINITIONS IN CARKIT MODE

Signal

Connected To

Direction

Description

txd

DATA[0]

UART TXD signal that is routed to the DM pin if the TxdEn

is set in the Carkit Control register.

rxd

DATA[1]

OUT

UART RXD signal that is routed to the DP pin if the RxdEn

bit is set in the Carkit Control register.

reserved

DATA[2]

OUT

Driven Low.

int

DATA[3]

OUT

Asserted when any unmasked interrupt occurs. Active high.

reserved

DATA[4:7]

OUT

Driven Low.

TABLE 6-9:

ULPI REGISTER PROGRAMMING EXAMPLE TO ENTER AUDIO MODE

R/W

Address

(HEX)

Value

(HEX)

Description

Result

Configure Non-Driving mode

OpMode

=01

Enable Audio connections

SpkrRightEn

=1, SpkrLeftEn=1

Enable carkit mode

CarkitMode

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