RT9758 datasheet(40/61 Pages) RICHTEK

40 / 61 page

RT9758

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS9758-03

May 2023

Device Power Up

The device is powered by VDDA. When VDDA voltage

is higher than VDDA_UVLO Threshold, the device will

start working. The VDDA voltage can be powered by

either VBUS or VOUT and that is dominated by the

higher voltage level.

Once the RT9758 is powered, the device will active the

address detection mechanism to assign the slave

address of device and configuration mode. The slave

address of device is determined by voltage level at

ADDR pin. The criteria of address detection threshold

are shown in electrical characteristics list. After address

detection is finished, the host can communicate with the

RT9758 by I2C serial interface. Furthermore, the

reaction time during VDDA > VDDA_UVLO to I2C

release (tWAKE_UP) is around 500

sec.

The RT9758 includes a watchdog timer that is enabled

default.

When

the

watchdog

timer

expired,

WDT_STAT and WDT_FLAG turn to high and INT pin

is pulsed (tINT_PULL_LOW) 256

sec for interrupt the host.

After reset wait time (tWDT_WAIT) 32msec, the related

registers are reset to default values. (Refer to Register

Descriptions for detail). If the device stays in watchdog

timeout status, host can read or write any register to

return counting.

The Figure 7 shows the device power on flow with

protections, insert and indictor function activation list in

each state. In order to reduce quiescent current when

charge system is unused, the RT9758 is established

low quiescent current mode that is called present mode.

If EN pin is pulled high or floating, the RT9758 will enter

present mode for power save. In present mode, most of

sensing circuit inside the RT9758 will be turned off. In

other words, all of protection and insert function are

inactivated. However, if user desires WRX_OK function

active in present mode, user can set WRX_OK_PSM bit

and WRX_OK_EN bit both to 1 to active it.

If EN pin is pulled low and set CHG_EN bit to 0, this

condition is called standby mode. In standby mode, the

AP can catch interrupt by INT pin if specific protection

or insert is triggered. Before start charging, the AP still

can set the register values by I2C protocol in present

mode and standby mode.

VDDA > VDDA_UVLO

Device address detection

and I

C release

EN pin is high or

floating

Disable Sensing Circuit

for Power Save

Yes

Enable Sensing Circuit

Function Activation List :

VOUT_INSERT

VBUS_INSERT

WRX_IN_INSERT

VOUT_OVP

VBUS_OVP

TDIE_OTP

VBUS_LOW_ERR

WRX_OK

WRX_IRE_OCP (if Q0 is turned on)

VOUT_PD_EN

CHG_EN = 0

Yes

4 Operation Mode

Present Mode

Function Activation List:

WRX_IN INSERT

(if WRX_O K_PSM bit set to 1)

WRX_OK

(if WRX_O K_PSM bit an d WRX_O K_EN bit set to 1)

VOUT_PD_EN

Standby Mode

Function Activation List :

VOUT_INSERT

VBUS_INSERT

WRX_IN_INSERT

WRX_OK

Refer to Table 2.

VOUT_PD_EN

Figure 7. Device Power On Flow with Protections, Insert and Indicator Function Activation List

RT9758 数据表(PDF) 40 Page - Richtek Technology Corporation

RT9758 数据表(HTML) 40 Page - Richtek Technology Corporation

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

数据表下载

链接网址

RT9758 数据表(PDF) 40 Page - Richtek Technology Corporation

RT9758 数据表(HTML) 40 Page - Richtek Technology Corporation

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

数据表 下载

链接网址

数据表下载