ATA5760 ATMEL Corporation, ATA5760 Datasheet - Page 22

• Manufacturer Part Number: ATA5760
• Description: Ata5760 Uhf Ask/fsk Receiver
• Manufacturer: ATMEL Corporation

Figure 10-2. Automatic Noise Suppression
Figure 10-3. Occurrence of a Pulse at the End of the Data Stream
10.2
Figure 10-4. Controlled Noise Suppression
22
Controlled Noise Suppression by the Microcontroller
(DATA_CLK)
POLLING/_ON
Serial bi-directional
data line
ATA5760/ATA5761
Data_out (DATA)
DATA_CLK
Dem_out
Data_out (DATA)
DATA_CLK
Bit-check
mode
Bit-check
mode
Bit check ok
Bit check ok
If the bit Noise_Disable (see
noise appears at the end of a valid data stream. To suppress the noise, the pin POLLING/_ON
must be set to Low. The receiver remains in receiving mode. Then, the OFF command causes
the change to the start-up mode. The programmed sleep time (see
not be executed because the level at pin POLLING/_ON is low, but the bit check is active in that
case. The OFF command activates the bit check also if the pin POLLING/_ON is held to Low.
The receiver changes back to receiving mode if the bit check was successful. To activate the
polling mode at the end of the data transmission, the pin POLLING/_ON must be set to High.
This way of suppressing the noise is recommended if the data stream is not Manchester or
Bi-phase coded.
Preburst
Preburst
Receiving mode,
data clock control
logic active
'1'
Receiving mode,
data clock control
logic active
Data stream
Data
Receiving mode
Timing error
Data
'1'
Digital Noise
'1'
t
OFF-command
ee
< T
T
Lim_min
Table 11-9 on page
ee
Bit-check
mode
OR T
Start-up
mode
Lim_max
T
Pulse
Bit-check
< t
mode
Bit check ok
ee
Bit check ok
< T
Digital noise
Lim_min_2T
25) in the OPMODE register is set to 0, digital
Preburst
Bit-check mode
Preburst
Receiving mode,
data clock control
logic active
OR t
ee
Receiving mode
> T
Data
Data
Lim_max2T
Table 11-7 on page
Digital Noise
Bit-check
mode
Sleep
mode
4896C–RKE–04/06
25) will