RT9941 datasheet(21/33 Pages) RICHTEK

21 / 33 page

RT9941

DS9941-01 April 2011

www.richtek.com

Figure 6. Power and Interface Module

Decoder

Registers

and Non-

Volatile

Memory

Interrupt

Controller

System and

Battery

Charger

Control Logic

Sequencing

& Operating

Mode

Setting

Host

Processor

CLK

DATA

nINT

nRESET

nPBSTAS

PWR_HOLD

HP_PWR

PWR_ON

VSYS

VMEM

VSYS

PWR_IN

BATT

PWR_EN

VSYS

LDO1, 2 voltage setting by Pin S1 and S2

LDO2 and Buck2 can be turned on/off by the external PWR_EN pin.

The I2C will be activated if the Buck1 is enabled.

LDO 4,5 can be turn on by PWR_EN pin in the first power on sequence.

LDO 1, 2, 3, 4, 5 and Buck1, 2 output voltages can turned on and off by I2C.

LDO 3, 4, 5 and Buck2 output voltages can be programmed by I2C.

Figure 7. RT9941 POWER ON/OFF Timing Diagram

PWR_ON

LDO3

BUCK1

LDO1

PWR_EN

LDO2

LDO4

LDO5

BUCK2

PWR_HOLD

2C: LDO4/5_EN

nRESET

300ms

100µs

200ms

VDD_PRE

VDD_IO, VDDIO_PLL

VDDIO_MEM, VREF_MEM

VDD_PDN

VDD_PLL, VDDA_PLL

VDDA2V5_USB,

VDDIO_TSC

VDDA_TSC, VREF_ADC

VDDA3V3_USB

10µs

100µs

300µs

RT9941 Datasheet(PDF) 21 Page - Richtek Technology Corporation

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