RK818 datasheet(33/93 Pages) ROCKCHIP

33 / 93 page

RK818 Datasheet

Rev 1.0

OTG and the HTMI5V. The OTG has a built-in current limiting switch, which can effectively

protect the boost converter from being damaged if a short circuit occurs at the OTG port.

As the USB input port and the OTG output port share a same pin, when the USB port is

being used as a power supply and charging the battery, the OTG switch is forbidden to be

turned on. Only when there is no external power supply plugged into the USB port, can the

OTG be turned on and serve as a power supply.

The key parameters such as operating mode, output voltage, and output current limit can

be configured through the I2C interface.

4.1.8 LOW DROPOUT REGULATORS (LDOS)

The RK818 also integrates nine LDOs and one low Rdson switch, with four LDOs (Ch6, Ch7,

Ch9 and Ch11) capable of providing up to 150mA and three LDOs (CH10, CH12 and CH14 )

providing maximum 300mA. The LDO on Ch8 is a low noise, high PSRR LDO which delivers up

to 100mA current and the LDO on Ch14 has 400mA current capability. The parameters such

as output voltage in the different operating modes can be adjusted through the I2C interface.

4.1.9 REAL TIME CLOCK (RTC)

The RK818 integrates a crystal oscillator buffer and a real time clock (RTC). The buffer

works with an external 32.768kHz crystal oscillator. With the RTC function, the PMIC provides

second/minute/hour/day/month/year information, alarm wake up as well as time calibration.

The RK818 provides two channels of 32.768kHz clocks with open drain outputs, where one

channel is constantly on and the other is enabled through I2C interface.

4.2 State Machine Description

OFF

ACTIVE

SLEEP

POWER ON enabled

POWER ON disabled

Sleep enabled

Sleep disabled

POWER ON disabled

Fig. 4-1 State Machine

4.3 Device Power on Enable Conditions

If none of the device power-on disable conditions is met, the following conditions are

available to turn on and/or maintain the ON state of the device:



PWRON signal is low for a period of time



USB is plugged in.（PLUG_IN_INT goes to high level）



RTC set time power on

4.4 Device Power on Disable Conditions

The PMIC will be powered off, or can not be powered on under the following conditions:

RK818 Datasheet(PDF) 33 Page - Rockchip Electronics Co., Ltd

RK818 Datasheet(HTML) 33 Page - Rockchip Electronics Co., Ltd

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93

Datasheet Download

Link URL