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  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP2036 Datasheet

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



  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP2036 Datasheet

Inductive Sensor Analog Front End Device

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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.



  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP2036 Datasheet

Inductive Sensor Analog Front End Device

No Preview Available !

MCP2036 pdf
www.DataSheet4U.com
MCP2036
Key Coils
CD4052
0
1
2
3
0
1
2
3
10nF
LREF
10Ω
10nF
FIGURE 1-2:
MCP2036 Typical Application
The coil voltages are then multiplexed into the
Synchronous Detector section by the LBTN/LREF
multiplexer. This allows the microcontroller to select
which signal is sampled by the detector. The detector
converts the coil voltages into a DC level using a
frequency mixer, amplifier, and filter.
The mixer is composed of two switches driven by the
clock present on the CLK signal input. The switches
toggle the amplifier/filter between an inverting and
non-inverting topology, at a rate equal to the clock input
frequency. This inverts and amplifies the negative side
of the signal, while amplifying the positive side. The
result is a pulsed DC signal with a peak voltage,
proportional to the amplitude of the AC coil voltage.
MCP2036
DRVOUT VDET-
RGAIN
LBTN
VDETOUT
VDET+
CS
LREF
REFSEL
VREF
DRVIN
CLK
I/O PWM
I/O
I/O ADC
I/O
PIC® Microcontroller
CFILTER
RGAIN
CFILTER
RIN CRGND
CIN
CADC
RADC
The gain of the detector is set by two pairs of resistors;
one pair are the internal fixed series resistors between
the frequency mixer and the amplifier. The second
resistor pair are the two external gain set resistors
(RGAIN). The two capacitors (CFILTER) in parallel with
the external gain setting resistors form a low pass filter
which converts the pulsed DC output signal into a
smooth DC voltage which is proportional to the AC
sensor voltage input. The output of the system is
present on the VDETOUT pin, which drives the
microcontroller’s ADC input for conversion into a digital
value.
The virtual ground reference for the detector/amplifier
is generated by a second internal op amp which
produces a virtual ground equal to ½ the supply
voltage. The virtual ground is available externally at the
VREF output and used internally throughout the
detector circuit, allowing single supply operation. A
small external capacitance is required to stabilize this
output and limit noise.
© 2009 Microchip Technology Inc.
DS22186A-page 3




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