AS3525 datasheet(150/194 Pages) AMSCO

150 / 194 page

AS3525-A/-B C22O22

Data Sheet, Confidential

www.austriamicrosystems.com

Revision 1.13

150

- 194

7.4.13

VBUS CP & Comparator

7.4.13.1 General

This block will be used to generate VBUS for USB OTG host operation and to read back VBUS voltage levels to support USB OTG protocols.

•

Input Voltage DVDD

•

Output Voltage 5V (VBUS)

•

regulated 1:2 charge pump with pulse skipping

•

Driver strength: 10mA

7.4.13.2 Register Description

Table 137 USB_UTIL Register

Name

Base

Default

USB_UTIL

I2C audio master

0x00

USB Utility Register

Offset: 0x17

This register is reset at a DVDD-POR.

Bit

Bit Name

Default

Access

Bit Description

7..5

000

n/a

LDO6_on

R/W

0: UVDD generation disabled

1: LDO6 for generating UVDD enabled.

3:2

COMP_TH<1:0>

R/W

Sets the threshold for the VBUS comparator

00: 4.5V

01: 3.18V

10: 1.5V

11: 0.6V

SKIP_ENAB

R/W

0: normal operation

1: enables the skip mode for the VBUS 1:2 charge pump. This

is increasing the efficiency for smaller loads, but increasing

the VBUS ripple.

CP_5V_on

R/W

0: disables VBUS charge pump

1: enables VBUS charge pump

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