AS3525-A/-B C22O22
Data Sheet, Confidential
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
0x00
USB_UTIL
I2C audio master
USB Utility Register
This register is reset at a DVDD-POR.
Offset: 0x17
Bit
Bit Name
LDO6_on
Default
000
0
Access
Bit Description
7..5
4
n/a
R/W
0: UVDD generation disabled
1: LDO6 for generating UVDD enabled.
3:2
COMP_TH<1:0>
0
R/W
Sets the threshold for the VBUS comparator
00: 4.5V
01: 3.18V
10: 1.5V
11: 0.6V
1
0
SKIP_ENAB
CP_5V_on
0
0
R/W
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.
0: disables VBUS charge pump
1: enables VBUS charge pump
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