User manual

System Overview

FIGURE 2-3: Received Base Station Command and Demodulated Data.

10 bit LF Command

Continuous LF for

RSSI Sample

from Base Station

Demodulated data output

from MCP2030

Change back

Configuration

MCP2030

Command to

a Soft Reset

MCP2030

MCU Sends

values

MCP3421

converts

RSSI to digital

ADC conversion

Completed here

Transponder Data Stream:

Header + 32 ID bits + 16 RSSI bits + 6 Parity bits + Stop bit

= Header + 54 Data bits + 1 Stop bit

AGC Stabilization time

(4 ms)

Gap for 500

Wake-Up Filter

Demodulated Data:

1100-0011-Parity-Stop = C3 (hex)

when the Base Station transmits

LSB first.

LF Command from Base Station

C Command

for ADC

SPI Command

for RSSI Output

Reading

ADC Conversion Data for RSSI

Input Coil Voltage

at pin 9 of U1

at pin 3 of U3

at pin 8 of U3

for RSSI data