RT1650 datasheet(22/26 Pages) RICHTEK

22 / 26 page

RT1650

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS1650-00

July

2015

Battery Charge Complete Detection

The

RT1650

supports

battery

charge

complete

detection function. A programmable charge complete

current

threshold

and

programmable

charge

complete delay time are provided. This function can be

used to send the Charge Status packet (0x05) to the

transmitter for indicating a full charged status 100%.

Note that this packet does not turn off the transmitter.

The charge complete current threshold is adjustable

from 0mA to 510mA and the default value is 50mA.

The charge complete time is also adjustable from 0

seconds to 3825 seconds and the default value is 180

seconds.

Charge Complete

Current Threshold

Charge Complete

Delay Time

Charge Current

time

Figure 14. Battery Charge Complete Detection

There are 3 operation modes when the charge

complete status is detected. The first mode is to send a

CS packet (0x05) to transmitter only. The CS packet

does not turn off the transmitter. In the second mode,

the RT1650 will send a CS packet (0x05) and an EPT

packet to transmitter. In the third mode, the RT1650 will

send a CS packet (0x05) and stop communication with

the transmitter.

Charge Complete

Detection

Send CS Packet

(0x05)

Send CS Packet

(0x05)

Stop

Communication

Send EPT Packet

(0x02)

Send CS Packet

(0x05)

CS Mode

Figure 15. Operation Modes of Charge Complete Detection

Receiver Coil and Resonant Capacitors

According to WPC specification, the dual resonant

circuit of the power receiver comprises the receiver coil

and capacitors C1 and C2. The receiver coil design is

related to system

design.

Coil shape, material,

inductance and shielding need to be considered.

Shielding

provides

protection

from

interference

between wireless power system and mobile electronic

device. The recommended coil self-inductance is

between 8

H to 13H. The capacitance of the resonant

capacitors can be calculated by the following equations.



2

C1=

2 f







2

C2=

2 f





In these equations, fs is resonant frequency with typical

value 100kHz; and fd is another resonant frequency

with typical value 1000kHz. L

’s is coil self-inductance

when placed on the interface surface of a transmitter;

and Ls is the self-inductance when placed away from

the transmitter.

RT1650 Datasheet(PDF) 22 Page - Richtek Technology Corporation

RT1650 Datasheet(HTML) 22 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

Datasheet Download

Link URL