Analog Front-End Device for BodyCom Applications
• Single Analog Input Pin for Signal Detection
• High Input Detection Sensitivity (3 mVPP, typical)
• High Modulation Depth Sensitivity (as low as 8%)
• Three Output Type Selections:
- Demodulated Data
- Carrier Clock
- Received Signal Strength Indicator (RSSI)
• Input Carrier Frequency: 125 kHz, typical
• Input Data Rate: 10 Kbps, maximum
• 8 Internal Configuration Registers
• Bidirectional Transponder Communication via the
same input pin (LF talk-back)
• Programmable Antenna Tuning Capacitance
(up to 63 pF, 1 pF/step)
• Programmable Output Enable Filter
• Low Standby Current: 2 µA, typical
• Low Operating Current: 10 µA, typical
• Serial Peripheral Interface (SPI) with external
• Industrial and Extended Temperature Range:
-40°C to +85°C (Industrial)
• BodyCom Applications
• Security Industry Applications
• Automotive Industry Applications
The MCP2035 is a single-channel, stand-alone Analog
Front-End (AFE) device for low-frequency (LF) signal
detection and low-power short range transponder
applications, such as BodyCom communications.
The device can detect an input signal with amplitude as
low as ~1 mVPP, and can demodulate an amplitude-
modulated input signal with as low as 8% modulation
depth. The device can also transmit data (LF talk-back)
by clamping and unclamping the input LC antenna
The device can output demodulated data, carrier clock
or RSSI current, depending on the output-type
selection configuration register bit settings. The
demodulated data and carrier clock outputs are
available on the LFDATA pin, while the RSSI output is
available on the RSSI pin. The RSSI current output is
linearly proportional to the input signal strength.
The device has programmable internal tuning
capacitors for the input channel. The user can program
the input tuning capacitors up to 63 pF, 1 pF per step.
The internal tuning capacitors can be used effectively
for fine-tuning of the external LC resonant circuit.
The device has eight volatile internal configuration
registers for dynamic configurations of the device
operation on-the-fly. All registers are readable and
programmable using the serial SPI commands, except
the read-only STATUS register.
The device is optimized for very low current
consumption and has various battery-saving low-
power modes (Sleep, Standby, Active).
This device is available in a 14-pin TSSOP package.
2012 Microchip Technology Inc.