Datasheet

TX COIL VOLTAGE / CURRENT
Transmitter Receiver
1
0
1
0
0
AC to DC
Voltage
Conditioning
Controller
RectificationDrivers
Controller
V/I
Sense
Power
bq5101x
bq500210
Communication
bq51013B
www.ti.com SLUSB62A –MARCH 2013–REVISED OCTOBER 2013
Figure 31.
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 (t
CLK
) 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 32 for an
example of the differential bi-phase encoding.
Figure 32. Differential Bi-phase Encoding Scheme (WPC volume 1: Low Power, Part 1 Interface
Definition)
The bits are sent LSB first and use an 11-bit asynchronous serial format for each portion of the packet. This
includes one start bit, n-data bytes, a parity bit, and a single stop bit. The start bit is always ZERO and the parity
bit is odd. The stop bit is always ONE. Figure 33 shows the details of the asynchronous serial format.
Figure 33. Asynchronous Serial Formatting (WPC volume 1: Low Power, Part 1 Interface Definition)
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