System Overview
10 bit LF Command
from Base Station
LF Command from Base Station
Continuous LF for
RSSI Sample
Input Coil Voltage
at pin 9 of U1
Wake-Up Filter Register
I C Command
Demodulated data output
Gap
from MCP2030 for 500 μ s
AGC Stabilization time
(4 ms)
MCP3421
converts
Change back
MCP2030
Configuration
MCU Sends SPI Command
a Soft Reset for RSSI Output
Command to
MCP2030 2
for ADC
ADC conversion
Completed here
at pin 3 of U3
RSSI to digital
values Demodulated Data:
1100-0011-Parity-Stop = C3 (hex)
Transponder Data Stream: the Base Station transmits
LSB first.
when
Header + 32 ID bits + 16 RSSI bits + 6 Parity bits + Stop bi t
= Header + 54 Data bits + 1 Stop bit
Reading
ADC Conversion Data for RSSI
at pin 8 of U3
for RSSI data
FIGURE 2-3:
Received Base Station Command and Demodulated Data.
? 2006 Microchip Technology Inc.
DS51637A-page 9
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