T5744 ATMEL [ATMEL Corporation], T5744 Datasheet - Page 10

• Manufacturer Part Number: T5744
• Description: UHF ASK Receiver
• Manufacturer: ATMEL [ATMEL Corporation]

Figure 10. Enable Timing (1)
Figure 11. Enable Timing (2)
Digital Signal
Processing
10
ENABLE
ENABLE
Dem_out
Dem_out
DATA
DATA
T5744
Sleep mode
Sleep mode
I
S
I
S
= I
= I
Soff
The data from the ASK demodulator (Dem_out) is digitally processed in different ways
and as a result converted into the output signal DATA. This processing depends on the
selected baudrate range (BR_Range). Figure 12 illustrates how Dem_out is synchro-
nized by the extended basic clock cycle T
has elapsed. The edge-to-edge time period tee_sig of the DATA signal as a result is
always an integral multiple of T
The minimum time period between two edges of the data signal is limited to tee_sig ³
TDATA_min. This implies an efficient suppression of spikes at the DATA output. At the
same time it limits the maximum frequency of edges at DATA. This eases the interrupt
handling of a connected microcontroller.
Soff
Start-up mode
Start-up mode
I
S
I
T
T
S
= I
Start-up
= I
Start-up
Son
Son
XClk
.
XClk
. Data can change its state only after T
Receiving mode
Receiving mode
I
S
I
S
= I
= I
Son
Son
t
t
ee_sig
ee_sig
4521B–RKE–01/03
XClk