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  Microchip Technology Semiconductor Electronic Components Datasheet  


MCP2036

Inductive Sensor Analog Front End Device


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MCP2036
Inductive Sensor Analog Front End Device
Features
• Complete Inductance Measurement System:
- Low-Impedance Current Driver
- Sensor/Reference Coil Multiplexer
- High-Frequency Detector
• Operating Voltage: 2.7 to 5.5V
• Low-Power Standby Mode
• Gain and Frequency set by external passive
components
Typical Applications
• Harsh environment inductive keyboards
• Inductive rotational sensor interface
• Inductive displacement sensor interface
• Inductive force sensor interface
Package Types
MCP2036 14-pin PDIP, SOIC
VREF 1
LREF 2
LBTN 3
VDD 4
DRVOUT 5
DRVIN 6
CLK 7
14 VDET+
13 VDET-
12 VDETOUT
11 VSS
10 Reserved
9 CS
8 REFSEL
Description
The MCP2036 Inductive Sensor Analog Front End
(AFE) combines all the necessary analog functions for
a complete inductance measurement system.
The device includes :
• High-frequency, current-mode coil driver for
exciting the sensor coil.
• Synchronous detector for converting AC sense
voltages into DC levels.
• Output amplifier/filter to improve resolution and
limit noise.
• Virtual ground reference generator for single
supply operation.
The device is available in 14-pin PDIP, SOIC and
16-pin QFN packages:
MCP2036 16-pin QFN
LREF 1
LBTN 2
VDD 3
DRVOUT 4
12 VDET-
11 VDETOUT
10 VSS
9 Reserved
© 2009 Microchip Technology Inc.
DS22186A-page 1



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MCP2036
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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
LREF
LBTN
CLK
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.
REFSEL
VSS
VDD
Input MUX
10
Mixer
Op. Amp. Block
10K
+
10K
-
Key Inductor Driver
Voltage
Reference
FIGURE 1-1:
CS DRVIN
MCP2036 Block Diagram
DRVOUT
VDET+
VDETOUT
VDET-
VREF
DS22186A-page 2
© 2009 Microchip Technology Inc.



Part Number MCP2036
Description Inductive Sensor Analog Front End Device
Maker Microchip Technology - Microchip Technology
Total Page 30 Pages
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