USB2422 datasheet(31/47 Pages) MICROCHIP

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DS00001726B-page 31

USB2422

4.4.25

SERIAL STRING REGISTERS (SERSTR)

4.4.26

BATTERY CHARGING ENABLE REGISTER (BC_EN)

4.4.27

BOOST UPSTREAM REGISTER (BOOSTUP)

Address:

92h-CFh

Size:

8 bits

Bits

Description

Type

Default

7:0

Serial String (SER_STR)

UNICODE UTF-16LE per USB 2.0 Specification.

Maximum string length is 31 characters (62 Bytes).

Note:

The String consists of individual 16 Bit UNICODE UTF-16LE

characters. The Characters will be stored starting with the LSB at

the least significant address and the MSB at the next 8-bit location

(subsequent characters must be stored in sequential contiguous

address in the same LSB, MSB manner).

R/W

00h

Address:

D0h

Size:

8 bits

Bits

Description

Type

Default

7:0

Battery Charging Enable (BC_EN)

Enables the battery charging feature for the corresponding port.

0 = Battery Charging support is not enabled

1 = Battery charging support is enabled

Bit 7= Reserved

Bit 6= Reserved

Bit 5= Reserved

Bit 4= Reserved

Bit 3= Reserved

Bit 2= Port 2 Battery Charging Enable

Bit 1= Port 1 Battery Charging Enable

Bit 0= Reserved

R/W

00h

Address:

F6h

Size:

8 bits

Bits

Description

Type

Default

7:2

RESERVED

1:0

Boost Upstream (BOOST_IOUT_A)

USB electrical signaling drive strength Boost Bit for Upstream Port 'A'.

00 = Normal electrical drive strength

01 = Elevated electrical drive strength (+4% boost)

10 = Elevated electrical drive strength (+8% boost)

11 = Elevated electrical drive strength (+12% boost)

R/W

00b

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