MCP2035-ISLASHST datasheet(31/68 Pages) MICROCHIP

31 / 68 page

 2012 Microchip Technology Inc.

DS22304A-page 31

MCP2035

4.0

APPLICATION INFORMATION

Microchip’s MCP2030 and MCP2035 are stand-alone

analog-front devices for low frequency (LF) signal

detection and low-power/short range transponder

applications. The MCP2035 is a single-channel

device, while the MCP2030 is a three-channel device

for more advanced applications.

The device’s high input sensitivity (1 mVPP) and

ability to detect very weakly modulated input signals

(as low as 8%), makes the device suitable for

various

intelligent

short

range

transponder

applications,

such

Microchip’s

BodyCom

applications.

4.1

MCP2035 BodyCom Application

Example

Figure 4-1 shows an example of a BodyCom system

that is utilizing the human body as a signal transmis-

sion medium. The system has two units: (a) Base Sta-

tion Unit and (b) Mobile Unit. An example of the

BodyCom communication sequence is as follows:

• When the human interfaces with the Base Station,

it is initialized by an event of either touch or prox-

imity, and the Base Station transmits a modulated

128 kHz command signal.

• This signal is then capacitively coupled to the

human body, propagates and is detected by the

Mobile Unit’s high sensitivity MCP2035 front-end

device.

• The Mobile Unit processes the Base Station’s

command information, and responds back using a

high frequency (HF, 8 MHz) carrier.

• This respond signal is then received by the HF

receiver in the Base Station, and demodulated

and fed to another MCP2035 in the Base Station

unit for digital waveforms. This return signal is

then processed by the MCU in the Base Station.

Figure 4-2 shows an example of the Mobile Unit

schematics. This BodyCom solution can be used in

various applications such as secure access control and

passive keyless entry for automobiles.

FIGURE 4-1:

BodyCom System Example Utilizing the Human Body as a Signal Transmission

Medium.

Note:

See Microchip’s Application Note AN1391

for more details of the BodyCom

applications solutions.

Transmitter

Driver

(8 MHz)

Mixer

Receiver

Base Station Unit

Mobile Unit

(128 kHz)

(8 MHz)

(128 kHz)

MCP2035

Human Interface

/Touch Pad

Capacitive

Coupling

Capacitive

Coupling

DSM

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