MCP2030 Bidirectional Communication Demo Kit User’s Guide
The LF command Base Station Demo Board consists of a 125 kHz carrier modulated
as follows:
1:
2:
3:
4:
5:
6:
4 ms ON for AFE’s AGC stabilization.
500 μs OFF.
2 ms ON followed by a 2 ms OFF (AFE’s output enable filter). This pattern is
dependant on the configuration setting of the receiving AFE.
10 bit of command type (3C), parity, and Stop bit. The bits are transmitted Least
Significant bits (LSb) first. The data is encoded with PWM method. (see
Figure 3-2 ).
50 ms ON for RSSI sample.
Waiting for a valid response from the Transponder.
500 μs
250 μs
LOGIC ‘0’
250 μs
500 μs
Bit Period
LOGIC ‘1’
FIGURE 3-2:
? 2006 Microchip Technology Inc.
PWM Data Encoding Format.
DS51637A-page 13
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