ATA3742_07 ATMEL [ATMEL Corporation], ATA3742_07 Datasheet - Page 15

• Manufacturer Part Number: ATA3742_07
• Description: UHF ASK/FSK Receiver
• Manufacturer: ATMEL [ATMEL Corporation]

Figure 5-3.
4900B–RKE–11/07
Polling Mode Flow Chart
NO
Sleep Mode:
All circuits for signal processing are
disabled. Only XTO and Polling logic are
enabled.
Output level on pin IC_ACTIVE = > low
I
T
Start-up Mode:
The signal processing circuits are
enabled. After the start-up time (T
all circuits are in stable
condition and ready to receive.
Output level on pin IC_ACTIVE = > high
I
T
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
I
T
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 ENABLE
I
S
S
S
S
Sleep
Startup
Bit-check
= I
= I
= I
= I
Soff
Son
Son
Son
= Sleep
OFF Command
Bit Check
X
OK ?
Sleep
YES
1024
T
Startup
Clk
)
Sleep:
X
T
T
X
Clk
Startup
Sleep
Bit-check
:
:
:
:
5-bit word defined by Sleep0 to
Sleep4 in OPMODE register
Extension factor defined by
X
Basic clock cycle defined by f
and pin MODE
Is defined by the selected baud-rate
range and T
is defined by Baud0 and Baud1 in
the OPMODE register.
Depends on the result of the bit check.
If the bit check is ok, T
depends on the number of bits to be
checked (N
utilized data rate.
If the bit check fails, the average
time period for that check depends
on the selected baud-rate range and
on T
defined by Baud0 and Baud1 in the
OPMODE register.
SleepTemp
Clk
. The baud-rate range is
according to Table 5-7
Bit-check
Clk
. The baud-rate range
) and on the
Bit-check
XTO
ATA3742
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