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| 型号： | MCP2030-I/ST |
| 厂商： | Microchip Technology |
| 文件页数： | 27/66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
4.0
APPLICATION INFORMATION
4.1
Battery Back-up and Batteryless
The MCP2030 is a stand-alone 3-channel analog
front-end device for low frequency (LF) sensing and
bidirectional transponder applications. By connecting
three orthogonally placed LC resonant antennas to
the LC input pins, it can detect signals from all
directions (x, y and z).
The device draws more current when all channels are
Operation
The device supports both battery back-up and
batteryless operation by the addition of external
components, allowing the device to be partially or
completely powered from the field.
Figure 4-1 shows an example of the external circuit for
the battery back-up.
enabled as compared to a single channel; therefore, it
is recommended to disable any unused channels by
setting Configuration Register 0 (Register 5-1).
The device’s high input sensitivity (as low as 1 mV PP )
and ability to detect weakly modulated (as low as 8%)
input signals with its low power feature set, makes the
device suitable for various applications such as a low-
cost hands-free Passive Keyless Entry (PKE)
transponder, an LF Initiator sensor for Tire Pressure
Monitoring Systems (TPMS) and long-range access
control applications in the automotive and security
industries.
V DD
V B A T
D FLAT1
D BLOCK
Note:
R LIM
Voltage on LCCOM combined with coil
input voltage must not exceed the maxi-
mum LC input voltage.
LCX
D LIM
C POOL
L X
Air Coil
C X
L Y
C Y
LCY
LCZ
L Z
C Z
LCCOM
D FLAT2
R COM
C COM
Legend:
C COM = LCCOM charging capacitor.
C POOL = Pool capacitor (or battery back-up capacitor), charges in field and powers device.
D BLOCK = Battery protection from reverse charge.
Schottky for low forward bias drop.
D FLAT = Field rectifier diodes.
D LIM = Voltage limiting diode, may be required to limit V DD voltage when in strong fields.
R COM = LCCOM discharge path.
R LIM = Current limiting resistor, required for air coil in strong fields.
FIGURE 4-1:
External Circuit Example for LF Field Powering and Battery Back-up Mode.
? 2005 Microchip Technology Inc.
DS21981A-page 27
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