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BQ50002 Datasheet(PDF) 9 Page - Texas Instruments |
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BQ50002 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 35 page tS tT HIGH State HIGH State tS tS tS tT Modulation Depth 100% LO State LO State bq50002 www.ti.com SLUSBW1A – OCTOBER 2015 – REVISED OCTOBER 2015 7.3 Feature Description 7.3.1 Demodulator The embedded demodulator outputs at least one valid bit stream under all modulation conditions that can be used by the accompanied bq500511 controller in order to comply with WPC specification. More specifically, the WPC worst case condition is defined as the transmitter operating at the minimum modulation level, and the receiver coil is measured by certain x, y and z axis distance to the center of the transmitter coil. Analog demodulation channel function diagram: • The diagram below from the WPC spec document explains the concept of Minimum Modulation. The peak-to- peak amplitude difference in TX coil waveform between HI and LO states is 400 mV. With 20-Vpp carrier waveform, and 400-mVpp modulation, with a typical divider it translates to 1 Vpp ±20 mVpp at the input of the demodulator channel. • The difference of the amplitude of the primary cell voltage in the HI and LO state is at least 200 mV. During a transition the primary cell current and primary cell voltages are undefined. See Figure 3. Figure 3. Amplitude Modulation of the Power Signal Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: bq50002 |
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