BQ500110_11 Datasheet, PDF (9/25 Pages) Texas Instruments – Qi Compliant Wireless Power Transmitter Manager

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Receiver Coil
Receiver
Capacitor
Rectifier
bq500110
SLUSAE0A – NOVEMBER 2010 – REVISED APRIL 2011
Modulation
Capacitors
Amax
A(0)
Operating state at logic “ 0”
Modulation
A(1)
Operating state at logic “ 1”
a)
Figure 4. Capacitive Modulation Circuit
Fsw
Fo(1) < Fo(0)
b)
F, kHz
The bq500110 is the industry's first wireless power dedicated transmitter controller that simplifies integration of
wireless power technology in consumer electronics, such as digital cameras, smart phones, MP3 players and
global positioning systems, along with infrastructure applications such as furniture and cars.
The bq500110 is a specialized digital power microcontroller that controls WPC A1, single coil, transmitter
functions such as analog ping, digital ping, variable frequency output power control, parasitic metal object
detection, protection against transmitter coil over-current, over temperature protection of the transmitter top
surface, and indication of the transmitter states of operation.
The bq500110 digital inputs receive and interpret signals from the analog demodulator circuit that provides first
stage of demodulation for digital commands sent by the WPC compliant Receiver. Based on the received
commands the controller provides control signals to the transmitter coil half-bridge power-driver. The controller
analog inputs monitor input DC voltage, Input Current, the Coil Current and the Thermal Protection input. These
analog inputs support monitoring and protective functions of the controller.
The bq500110 directly controls two LEDs to indicate the controller standby, power transfer, PMOD warning,
PMOD-stop and system fault states.
Option Select Pins
Two pins in bq500110 are allocated to program the LED mode and the PMOD mode of the device. At power–up,
a bias current is applied to pins LED_MODE and PMOD_THR and the resulting voltage measured in order to
identify the value of the attached programming resistor. The values of the operating parameters set by these pins
are determined using Option Select Bins. For LED_MODE the selected bin determines the LED behavior based
on LED Modes; for the PMOD_THR the selected bin sets a threshold used for parasitic metal object detection
(see Metal Object Detection (MOD) section).
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