BQ500412 Datasheet, PDF (8/28 Pages) Texas Instruments – Low System Cost, Wireless Power Controller for WPC TX A6

bq500412
SLUSBO2A – NOVEMBER 2013 – REVISED DECEMBER 2013
www.ti.com
PIN
NO.
NAME
32 GND
33 _V33D
34 _V33A
35 BPCAP
36 GND
37 COMM_A+
38 COMM_A-
39 COMM_B+
40 COMM_B-
41 RESERVED
42 _{I_SENSE}
43 LOSS_THR
44 LED_MODE
45 _{V_SENSE}
46 _{V_IN}
47 GND
48 ADCREF
49 EPAD
PIN FUNCTIONS (continued)
I/O
DESCRIPTION
— GND.
— Digital core 3.3-V supply. Be sure to decouple with bypass capacitors as close to the part as
possible.
— Analog 3.3-V Supply. This pin can be derived from V33D supply, decouple with 10-Ω resistor
and additional bypass capacitors
— Bypass capacitor for internal 1.8-V core regulator. Connect bypass capacitor to GND.
— GND.
I Digital demodulation non-inverting input A, connect parallel to input B+.
I Digital demodulation inverting input A, connect parallel to input B-.
I Digital demodulation non-inverting input B, connect parallel to input A+.
I Digital demodulation inverting input B, connect parallel to input A-.
O Reserved, leave this pin open.
I Transmitter input current, used for efficiency calculations. Use 20-mΩ sense resistor and
A=50 gain current sense amplifier.
I Input to program FOD/PMOD thresholds and FOD_CAL correction.
I Input to select from four LED modes.
I Transmitter input voltage, used for efficiency calculations. Use 76.8-kΩ to 10-kΩ divider to
minimize quiescent current.
I System input voltage, used for DPL. Use 76.8-kΩ to 10-kΩ divider to minimize quiescent
current.
— GND.
I External Reference Voltage Input. Connect this input to GND.
— Flood with copper GND plane and stitch vias to PCB internal GND plane.
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