RT9481 datasheet(16/41 Pages) RICHTEK

16 / 41 page

RT9481

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS9481-00 June 2015

Table 6. LBP Register Setting Table

LBP[2:0]

Low Battery Protection Level

000

2.5V

001

2.6V

010

2.7V

011

2.8V

100

2.9V

101

3V (default)

110

3.1V

111

3.2V

USB Battery Charging Specification

The RT9481 supports adapter detection for dedicated

charging port, Charging downstream port and Standard

downstream port by D- and D+.

USB Dedicated Charging Port Controller

The RT9481 supports an USB dedicated charging port

(DCP) controller. The DCP controller detects USB data

line voltage, and automatically provides the correct

electrical signatures on the data lines (DM and DP) to

charge compliant devices.

IRQ and STA Operation

RT9481 summarize all IRQ items in the register table.

All IRQ_status registers are implemented as reset after

read. If IRQ_enable bit is Low, the IRQ_status bit will

not update status. IRQ_enable will mask IRQ_status to

trigger IRQ Low, so the system can decide which

interrupt is necessary.

When STA low to high or high to low IRQ will be trigger

but STA will keep situation and cannot be masked only

mask IRQ.

REG : TSDI

PIN : INT

Event : TSD

REG : TSDIM

0: Not Mask Event

1: Mask Event

Event is not mask

For CHG_STA2, CHG_STA3 and MISC_STA2 register

REG : CHG_STA2_ALT

C Read Clear

Interrupt is mask

C Read Clear

REG : IEOCI

PIN : INT

Event : IEOC

REG : IEOCIM

I2C Read Clear

0: Not Mask Event

1: Mask Event

Flag is mask

For CHG_IRQ and MISC_IRQ register

Figure 1. IRQ and STA Operation

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