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MCP2036-E/P датащи(PDF) 2 Page - Microchip Technology |
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MCP2036-E/P датащи(HTML) 2 Page - Microchip Technology |
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2 / 30 page ![]() MCP2036 DS22186B-page 2 © 2009 Microchip Technology Inc. 1.0 FUNCTIONAL DESCRIPTION The MCP2036 measures a sensor coil’s impedance by exciting the coil with a pulsed DC current and measuring the amplitude of the resulting AC voltage waveform. The drive current is generated by the on-chip current amplifier/driver which takes the high-frequency triangular waveform present on the DRVIN input, and amplifies it into the pulsed DC current for exciting the series combination of the sensor coils. The AC voltages generated across the coils, are then capacitively coupled into the LBTN and LREF inputs. An input resistance of 2K between the inputs and the virtual ground offsets the AC input voltages up to the signal ground generated by the reference voltage generator, as shown in Figure 1-1. FIGURE 1-1: MCP2036 Block Diagram Voltage Reference REFSEL VDETOUT DRVIN CLK DRVOUT LBTN LREF VREF VDD VSS 0 1 Input MUX CS Key Inductor Driver Mixer VDET+ VDET- + - 10K 10K Op. Amp. Block |
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