RFHCS362F Datasheet, PDF (49/60 Pages) Microchip Technology – Code Hopping Encoder with UHF ASK/FSK Transmitter

rfHCS362G/362F
FIGURE 10-5:
MANCHESTER FORMAT SUMMARY (MOD=1)
12
START bit
bit 0 _{bit 1} bit 2
16
TE TE
LOGIC "0"
LOGIC "1"
TBP
STOP bit
Preamble Header
Encrypted
Portion
Fixed Code
Portion
Guard
Time
FIGURE 10-6:
MANCHESTER PREAMBLE/HEADER FORMAT (MOD=1)
P1
31 x TE Preamble
P16
Bit 0 Bit 1
4 x TE
Data Word
Header Transmission
TABLE 10-5: CODE WORD TRANSMISSION TIMING PARAMETERS—MANCHESTER MODE^(1,3)
VDD = +2.0V to 6.3V
Industrial
(I): TAMB = -40 °C to +85 °C
11
BSEL Value
10
01
00
Symbol
Characteristic
Typical
Typical
Typical
TE
Basic pulse element⁽³⁾
800
400
200
TBP
Bit width
2
2
2
TP
Preamble duration
31
31
31
TH
Header duration
4
4
4
TC
Data duration
138
138
138
TG
Guard time⁽²⁾
26.8
26.4
26
—
Total transmit time
166
96
61
—
Data Rate
625
1250
2500
Note 1: The timing parameters are not tested but derived from the oscillator clock.
2: Assuming GUARD = 10 option selected in CONFIG_0 Configuration Word.
3: Allow for a +/- 10% tolerance on the encoder internal oscillator after calibration.
Typical
100
2
31
4
138
25.8
43
5000
Units
µs
TE
TE
TE
TE
ms
ms
bps
© 2002 Microchip Technology Inc.
Preliminary
DS41189A-page 49