参数资料
型号: MCP2036T-I/SL
厂商: Microchip Technology
文件页数: 12/30页
文件大小: 0K
描述: IC KEYLESS ENTRY AFE 14-SOIC
标准包装: 2,600
类型: 传感器接口
应用: 模拟 I/O
安装类型: 表面贴装
封装/外壳: 14-SOIC(0.154",3.90mm 宽)
供应商设备封装: 14-SOIC
包装: 带卷 (TR)
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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