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| 型號： | MCP2036T-I/ML |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 25/30頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AFE KEYLESS ENTRY 16QFN |
| 標準包裝： | 3,300 |
| 系列： | * |
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MCP2036
DS22186C-page 4
2009 Microchip Technology Inc.
1.1
Coil Driver
The coil driver produces the excitation current for the
sensor coils.
The coil driver input is derived from the digital clock
supplied to the CLK input. The digital signal is first
filtered through a low-pass filter, composed of RIN and
CIN, and passed to the DRVIN input. The driver will
create a triangular current in phase and proportional
with the input voltage. Because the digital drive into the
RIN-CIN filter has a 50% duty cycle, the voltage on the
DRVIN input will be centered at VDD/2. The relationship
between voltage, current, inductance and frequency is
shown in Equation 1-1.
EQUATION 1-1:
1.2
Synchronous Detector and Output
Amplifier
The Synchronous Detector has two inputs, LREF and
LBTN, selectable by REFSEL. This routes either signal
into the frequency mixer of the detector. The frequency
mixer then converts the AC waveform into a pulsed DC
signal which is amplified and filtered.
The gain of the amplifier is user-settable, using an
EQUATION 1-2:
An ADC plus firmware algorithm then digitizes the
detector output voltage and uses the resulting data to
detect a key press event.
1.3
Virtual Ground Voltage Reference
Circuit
To create both an inverting and non-inverting amplifier
topology, a pseudo split supply design is required. To
generate the dual supplies required, a rail splitter is
included, which generates the virtual ground by creat-
ing a voltage output at VDD/2. The output is used by the
external passive network of the Detector/Amplifier sec-
tion as a reference on the non-inverting input. A bypass
capacitor of 0.1 uF is required to ensure the stability of
the output. For reference accuracy, no more than 3 mA
should be supplied to, or drawn from the reference
output pin.
ΔV
OUT
ΔI
DRV
L
COIL
2
F
DRV
()
=
V
OUT
Pulsed Output Voltage
=
ΔI
DR V
AC Drive Current Amplitude
=
F
DRV
AC Drive Current Frequency
=
L
COIL
Inductance of the Sensor Coil
=
Note:
These equations assume a 50% duty cycle.
Note:
The
output
amplifier/filter
uses
a
differential connection, so its output is
centered to VREF (VDD/2). The amplitude
of the detected signal should be calculated
as the difference between voltages at the
output of the detector and the reference
voltage.
Gain
R
GAIN 10kOhm
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