參數(shù)資料
型號(hào)： MCP2036T-I/ML
廠商： Microchip Technology
文件頁數(shù)： 23/30頁
文件大小： 0K
描述： IC AFE KEYLESS ENTRY 16QFN
標(biāo)準(zhǔn)包裝： 3,300
系列： *
2009 Microchip Technology Inc.
DS22186C-page 3
MCP2036
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.
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 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.
The ISOL input is used to isolate the detector from
potential noise sources during the measurement of the
virtual ground reference during a button measurement.
MCP2036
LREF
LBTN
LREF
DRVOUT
10
Ω
10nF
REFSEL
10nF
I/O
0
1
2
3
0
1
3
2
CD4052
Key Coils
PIC Microcontroller
CS
I/O
VDET-
VDETOUT
VDET+
VREF
CLK
DRVIN
PWM
ADC
CFILTER
RGAIN
CRGND
RIN
CIN
RADC
CADC
ISOL
I/O
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