RT1650WSC datasheet(21/26 Pages) RICHTEK

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RT1650

is a registered trademark of Richtek Technology Corporation.

DS1650-00

July

2015

www.richtek.com

Option for GPIO



Internal pull-up option (pull-up to 3.3V)



Internal pull-low option



GPIO can be push-pull or open-drain architecture

when GPIO programmed as an output.

Table 5. RT1650 GPIO Specification

Symbol

Description

Min

Typ

Max

Vil

input logic low voltage

0.8V

Vih

input logic high voltage

Vol

output low voltage

0.4V

Voh

output high voltage when push-pull architecture

2.6V

3.3V

Voh

output high voltage when open-drain

architecture

Hi-Z

Indicator Output

An open-drain output pin, CHG, is provided to indicate

the status of wireless power receiver. The CHG pin can

be connected to a LED for charge status indicator.

When the output of the RT1650 is enabled, the

open-drain N-FET at CHG pin will be pulled to low

level.

Input Over-Voltage Protection

When the input voltage increases suddenly, the

RT1650 adjusts voltage-control loop to maintain

regulator output voltage and sends control error

packets to the transmitter every 30ms until the input

voltage comes back to the VRECT target level (refer to

Dynamic Rectifier Voltage Control Section). Once the

VRECT voltage exceeds its over-voltage threshold

(11.5V typ.), the RT1650 turns on the N-FETs at

CLMP1 and CLMP2 pins to shunt the input current

through external capacitors. By the way the CLAMP

function may affect the communication signal to let the

Tx re-start up.

Over-Temperature Protection

The RT1650 provides an Over Temperature Protection

(OTP) feature to prevent excessive power dissipation

from overheating the device. The OTP function shuts

down the linear regulator operation when the junction

temperature

exceeds

150°C.

Once

the

junction

temperature cools down by around 20°C, the receiver

will automatically resume operating.

Foreign Object Detection

The RT1650 is a WPC 1.1.1 compatible device. In

order to enable a power transmitter to monitor the

power loss across the interface as one of the possible

methods to limit the temperature rise of foreign objects,

the RT1650 reports its received power to the power

transmitter. The received power equals the power that

is available from the output of the power receiver plus

any power that is lost in producing that output power

(the power loss in the secondary coil and series

resonant capacitor, the power loss in the shielding of

the power receiver, the power loss in the rectifier). In

WPC1.1.1 specification, Foreign Object Detection

(FOD) is enforced. This means the RT1650 will send

received power information with known accuracy to the

transmitter. The received power is sensed as the

Figure 13.

AC1

AC2

Rectifier

Regulator

POUT

COUT

VRECT

RECT

CRECT

PTX,AC

PRX,AC

PRECT

IOUT

OUT

Figure 13. Received Power Sensed

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