Datasheet

Comm
Rectifier
Receiver Coil
Receiver
Capacitor
Modulation
Capacitors
Amax
A(0)
A(1)
F, kHz
Fo(1) < Fo(0)
Operating state at logic “ 0”
Operating state at logic “ 1”
Fsw
a)
b)
bq500210
www.ti.com SLUSAL8C –JUNE 2011–REVISED SEPTEMBER 2012
Figure 4. Capacitive Modulation Circuit
The bq500210 is a second generation wireless power dedicated transmitter controller that simplifies integration of
wireless power technology into consumer electronics, such as digital cameras, smart phones, MP3 players, and
global positioning systems, along with infrastructure applications such as furniture and cars.
The bq500210 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, over temperature protection of the transmitter top surface, and indication of the transmitter operating
states.
The bq500210 digital demodulation inputs receive scaled down voltages from the transmitter resonant
components. The digital demodulation algorithm is a combination of several digital signal processing techniques
that decodes information packets sent by the power receiving device and provides necessary changes to power
drive signals facilitating closed loop regulation. The controller analog inputs monitor input DC voltage, input
current, and the thermal protection input. These analog inputs support monitoring and protective functions of the
controller.
The bq500210 controls two LEDs to indicate transmitter operating and fault states. Having the LEDs connected
directly to the controller simplifies the transmitter electrical schematic and provides a cost effective solution.
Option Select Pins
Two pins (43, 44) in the bq500210 are allocated to program the PMOD mode and the LED 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 (PMOD) section).
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