參數(shù)資料
型號(hào): MCP2036-I/MG
廠商: Microchip Technology
文件頁(yè)數(shù): 12/30頁(yè)
文件大?。?/td> 0K
描述: IC KEYLESS ENTRY AFE 16-QFN
標(biāo)準(zhǔn)包裝: 120
類(lèi)型: 傳感器接口
應(yīng)用: 模擬 I/O
安裝類(lèi)型: 表面貼裝
封裝/外殼: 16-VFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝: 16-QFN-EP(3x3)
包裝: 管件
產(chǎn)品目錄頁(yè)面: 684 (CN2011-ZH PDF)
MCP2036
DS22186B-page 2
2009 Microchip Technology Inc.
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
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.
FIGURE 1-1:
MCP2036 Block Diagram
Voltage
Reference
REFSEL
VDETOUT
DRVIN
CLK
DRVOUT
LBTN
LREF
VREF
VDD
VSS
0
1
Input MUX
CS
Key Inductor Driver
Mixer
VDET+
VDET-
+
-
10K
Op. Amp. Block
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