MCP2036-ESLASHP datasheet(2/30 Pages) MICROCHIP

2 / 30 page

MCP2036

DS22186B-page 2

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

Input MUX

Key Inductor Driver

Mixer

VDET+

VDET-

10K

Op. Amp. Block

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