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BQ51221 Datasheet(PDF) 21 Page - Texas Instruments

Part # BQ51221
Description  BQ51013B Highly Integrated Wireless Receiver Qi (WPC v1.2) Compliant Power Supply
PDF  50 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

BQ51221 Datasheet(HTML) 21 Page - Texas Instruments

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C
RES1
C
RES2
COIL
AC1
AC2
VRECT
GND
C
MOD
Figure 8-5. Capacitive Modulation
The amplitude change in the TX coil voltage or current can be detected by the transmitter's decoder. The
resulting signal observed by the TX is shown in Figure 8-6.
AC to DC
Voltage/
Current
Conditioning
Controller
Rectification
Drivers
System
Load
Controller
V/I
Sense
Power
BQ51013B
Communication
Battery
Charger
LI-Ion
Battery
BQ500212A
0
0
0
1
1
Figure 8-6. TX Coil Voltage/Current
The WPC protocol uses a differential bi-phase encoding scheme to modulate the data bits onto the TX coil
voltage/current. Each data bit is aligned at a full period of 0.5 ms (tCLK) or 2 kHz. An encoded ONE results in two
transitions during the bit period and an encoded ZERO results in a single transition. See Figure 8-7 for an
example of the differential bi-phase encoding.
www.ti.com
BQ51013B
SLUSB62D – MARCH 2013 – REVISED SEPTEMBER 2020
Copyright © 2020 Texas Instruments Incorporated
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Product Folder Links: BQ51013B



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