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| 型号： | MCP2030-I/ST |
| 厂商： | Microchip Technology |
| 文件页数： | 28/66页 |
| 文件大小： | 0K |
| 描述： | IC KEYLESS ENTRY AFE 14TSSOP |
| 标准包装： | 96 |
| RF 型： | ISM |
| 频率： | 125kHz |
| 特点： | 10kbps |
| 封装/外壳： | 14-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 14-TSSOP |
| 包装： | 管件 |
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MCP2030
4.2
Application Examples
The output of the MCP2030 is fed into the external
f o = ------------------
Figure 4-2 shows an example of an external circuit for
a bidirectional communication transponder application.
Each LC input pin is connected to an external LC
resonant circuit. To achieve the best performance, the
resonant frequency of the LC circuit needs to be
matched to the detecting carrier frequency of interest.
The resonant frequency is given by the following
equation:
1
2 π LC
In typical 125 kHz applications, the L value is a few mH,
and the C value is a few hundred pF, for example,
L = 4.9 mH, and C = 331 pF.
The resonant frequency can be fine-tuned by program-
ming the internal tuning capacitors.
MCU. The external MCU can send data by clamping on
and clamping off the MCP2030 coil voltages using an
SPI command, or via a UHF transmitter.
The RSSI output of the MCP2030 can be digitized by
the MCU firmware. Users can also consider using a
MCU that has an internal analog-to-digital converter
(ADC) such as the PIC16F684 or a stand-alone ADC
device.
Figure 4-3 shows an example of a hands-free Passive
Keyless Entry (PKE) system. The base station unit
transmits an LF command. The MCP2030 detects the
base station command and feeds the detected output
to the external MCU (PIC16F636). If the command is
correct, the MCU responds via an external UHF
transmitter or by using the LF talk-back modulators of
the MCP2030 device.
Figure 4-4 shows an example when the device is used
for a tire pressure monitoring sensor application. The
device detects the LF Initiator commands and transmits
the tire pressure data to the base station via an external
UHF transmitter.
MCP2030
SW1
V SS
V SS
SW2
CS
LCCOM
air-core
ferrite-core
SCLK/ALERT
NC
C
L
coil
coil
SW3
PIC16F636/684
To ADC
RSSI
LCX
C
L
C
L
SW4
NC
LCY
LFDATA/CCLK/SDIO LCZ
+3V
V DD
V DD
+3V
ferrite-core coil
315/434 MHz
RF Circuitry
(UHF TX)
FIGURE 4-2:
DS21981A-page 28
Example of External Circuits for Bidirectional Communication Transponder Applications.
? 2005 Microchip Technology Inc.
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| MCP2030T-I/SL | 功能描述:射频无线杂项 Keyless Entry AFE RoHS:否 制造商:Texas Instruments 工作频率:112 kHz to 205 kHz 电源电压-最大:3.6 V 电源电压-最小:3 V 电源电流:8 mA 最大功率耗散: 工作温度范围:- 40 C to + 110 C 封装 / 箱体:VQFN-48 封装:Reel |
| MCP2030T-I/ST | 功能描述:射频无线杂项 Keyless Entry AFE RoHS:否 制造商:Texas Instruments 工作频率:112 kHz to 205 kHz 电源电压-最大:3.6 V 电源电压-最小:3 V 电源电流:8 mA 最大功率耗散: 工作温度范围:- 40 C to + 110 C 封装 / 箱体:VQFN-48 封装:Reel |
| MCP2035-I/ST | 功能描述:射频前端 RoHS:否 制造商:Skyworks Solutions, Inc. 类型: 工作频率:2.4 GHz, 5 GHz 最大数据速率:54 Mbps 噪声系数: 工作电源电压:3.3 V 电源电流:180 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-32 |
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