AS3517H-ECTP datasheet(78/94 Pages) AMSCO

78 / 94 page

AS3517 V17

Data Sheet, Confidential

www.austriamicrosystems.com

Table 79 USB_UTIL Register

Name

Base

Default

USB_UTIL_DCDC

2-wire serial

00h

USB Utility Register

Offset: 1Ah

Controls VBUS output voltage and the external transistor as well as special mode bits

for the DCDC step-down converters

This register is reset at a DVDD-POR.

Bit

Bit Name

Default

Access

Bit Description

7:6

I_PMOS_GATE

R/W

Sets the gate current level into the external PMOS transistor to

control the inrush current to VBUS

00: 1µA

01: 2µA

10: 3µA

11: 4µA

DCDC_PS_OFF

R/W

Disables 200uA power saving in skip mode

0: Power savings ON

1: Power savings OFF

DCDC_PMOS_OFF

R/W

Disables the PMOS of DCDC step down 1, 2 and 3 to be

switched fully on, if the regulator cannot achieve the

programmed output voltage anymore.

0: PMOS fully ON

1: PMOS switching

3:2

VBUS_COMP_TH

R/W

Sets the threshold for the VBUS comparator. The output can

be read in register 25h.

00: 4.5V

01: 3.18V

10: 1.5V

11: 0.6V

VBUS_SKIP_ON

R/W

Enables the skip mode for the VBUS 1:2 charge pump which

increases efficiency for small loads connected to VBUS supply,

but increases VBUS supply ripple

VBUS_ON

R/W

Switches the VBUS output voltage ON and OFF

0: VBUS output voltage disabled

1: VBUS output voltage enabled

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