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ATA5728C Datasheet(PDF) 11 Page - ATMEL Corporation

Part # ATA5728C
Description  UHF ASK/FSK Receiver
Download  44 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATA5728C Datasheet(HTML) 11 Page - ATMEL Corporation

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11
ATA5723C/ATA5724C/ATA5728C [DATASHEET]
9248D–RKE–10/14
Figure 8-1. Polling Mode Flow Chart
8.2
Bit-check Mode
In bit-check mode the incoming data stream is examined to distinguish between a valid signal from a corresponding
transmitter and signals due to noise. This is done by subsequent time frame checks where the distances between 2 signal
edges are continuously compared to a programmable time window. The maximum number of these edge-to-edge tests,
before the receiver switches to receiving mode, is also programmable.
Bit-check Mode:
The incoming data stream is
analyzed. If the timing indicates a valid
transmitter signal, the receiver is set to
receiving mode. Otherwise it is set to
Sleep mode.
Output level on Pin IC_ACTIVE = > high
TBit-check
IS = ISon
Start-up Mode:
The signal processing circuits are
enabled. After the start-up time (TStartup)
all circuits are in stable
condition and ready to receive.
Output level on Pin IC_ACTIVE = > high
TStartup
IS = ISon
Receiving Mode:
The receiver is turned on permanently
and passes the data stream to the
connected microcontroller.
It can be set to Sleep mode through an
OFF command via Pin DATA or
Polling/_ON.
Output level on Pin IC_ACTIVE = > high
IS = ISon
Sleep Mode:
All circuits for signal processing are
disabled. Only XTO and Polling logic are
enabled.
Output level on Pin IC_ACTIVE = > low
TSleep = Sleep x XSleep x 1024 x TClk
IS = ISoff
Bit Check
OK ?
5-bit word defined by Sleep 0 to
Sleep 4 in OPMODE register
Sleep:
Is defined by the selected baud rate
range and TClk. The baud-rate range
is defined by Baud 0 and Baud 1 in
the OPMODE register.
TStartup:
Basic clock cycle defined by fXTO
and Pin MODE
TClk:
If the bit check fails, the average
time period for that check depends
on the selected baud-rate range and
on TClk. The baud-rate range is
defined by Baud 0 and Baud 1 in the
OPMODE register.
If the bit check is ok, TBit-check
depends on the number of bits to be
checked (NBit-check) and on the
data rate used.
Depends on the result of the bit check
TBit-check:
Extension factor defined by
XSleepStd according to Table 11-8
XSleep:
OFF Command
YES
NO


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