T5743P3 ATMEL [ATMEL Corporation], T5743P3 Datasheet - Page 19

• Manufacturer Part Number: T5743P3
• Description: UHF ASK/FSK Receiver
• Manufacturer: ATMEL [ATMEL Corporation]

Figure 22. Timing Diagram of the Data Clock
Figure 23. Data Clock Disappears Because of a Timing Error
4569A–RKE–12/02
Dem_out
Data_out (DATA)
DATA_CLK
DATA_CLK
Dem_out
Data_out (DATA)
The data clock is available, after the data clock control logic has detected the distance
2T (Start bit) and is issued with the delay t
22).
If the data clock control logic detects a timing or logical error (Manchester code viola-
tion), like illustrated in Figure 23 and Figure 24, it stops the output of the data clock. The
receiver remains in receiving mode and starts with the bit check. If the bit check was
successful and the start bit has been detected, the data clock control logic starts again
with the generation of the data clock (see Figure 25).
It is recommended to use the function of the data clock only in conjunction with the bit
check 3, 6 or 9. If the bit check is set to 0 or the receiver is set to receiving mode via the
Pin POLLING/_ON, the data clock is available if the data clock control logic has
detected the distance 2T (Start bit).
Note that for Bi-phase-coded signals, the data clock is issued at the end of the bit.
'1'
'1'
Receiving mode,
data clock control
logic active
Bit check ok
Bit-check mode
Timing error
'1'
'1'
'1'
'1'
(T
T
ee
ee
Preburst
< T
'1'
'1'
Lim_min
OR T
T
'1'
Lim_max
'1'
2T
<T
Start bit
ee
Data
'0'
< T
'0'
Lim_min_2T
Receiving mode,
bit check active
data clock control logic active
'1'
'1'
OR T
Delay
Receiving mode,
ee
> T
'1'
'1'
Lim_max_2T
after the edge on Pin DATA (see figure
t
Delay
)
Data
'0'
'0'
'1'
'1'
t
P_Data_Clk
'0'
'0'
T5743
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