參數(shù)資料
型號(hào): MCP2036-I/P
廠商: Microchip Technology
文件頁(yè)數(shù): 29/30頁(yè)
文件大?。?/td> 0K
描述: IC KEYLESS ENTRY AFE 14-PDIP
標(biāo)準(zhǔn)包裝: 30
類型: 傳感器接口
應(yīng)用: 模擬 I/O
安裝類型: 通孔
封裝/外殼: 14-DIP(0.300",7.62mm)
供應(yīng)商設(shè)備封裝: 14-PDIP
包裝: 管件
MCP2036
DS22186B-page 8
2009 Microchip Technology Inc.
FIGURE 3-2:
Using GPIO for Key Selection (Example)
3.1
Application example
Figure 3-3 shows an example for a 4-key Inductive
Touch keyboard with key controlled by the IO pins of
the PIC MCU.
FIGURE 3-3:
MCP2036 Typical Application
The PIC microcontroller is used to generate a square
wave signal and to do all the necessary operations for
proper detection of the key press event.
Then, RIN-CIN filter converts the square wave output of
the PWM into a quasi-triangular waveform.
To calculate the amplitude of the triangular signal, the
standard charging time equation for an RC network will
be used, as shown in Equation 3-1:
EQUATION 3-1:
For the first half of the square wave, the capacitor CIN
is charged through RIN, for the second half, it is
discharged through RIN, and assuming that clock
signal has a 50% duty cycle factor, we can consider:
EQUATION 3-2:
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
Vt
() V
step
1
tRC
()
exp
[]
=
V
start
V
DD 2
-ΔV
=
V
stop
V
DD 2
+ΔV
=
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