t5743n ATMEL Corporation, t5743n Datasheet - Page 9

• Manufacturer Part Number: t5743n
• Description: Ask/fsk Receiver
• Manufacturer: ATMEL Corporation

IC_ACTIVE
Rev. A1, 25-May-00
( Number of checked Bits: 3 )
Bit check
Dem_out
Data_out (DATA)
NO
Receiving mode:
The receiver is turned on permanently and
passes the data stream to the connected mC.
It can be set to Sleep mode through an OFF
command via Pin DATA or POLLING/_ON.
Output level on Pin IC_ACTIVE => high
I
Sleep mode:
All circuits for signal processing are
disabled. Only XTO and Polling logic is
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
are in stable condition and ready to receive.
Output level on Pin IC_ACTIVE => high
I
T
Bit-check mode:
The incomming 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
S
S
S
S
Sleep
Startup
Bit-check
= I
= I
= I
= I
Son
Soff
Son
Son
= Sleep × X
Start–up mode
T
Start–up
OFF command
Bit check
OK ?
Sleep
Figure 11. Timing diagram for complete successful bit check
× 1024 × T
YES
Startup
Preliminary Information
) all circuits
Clk
Figure 10. Polling mode flow chart
1/2 Bit
1/2 Bit
Bit–check mode
T
Sleep:
X
T
T
T
Bit-check:
Bit–check
Clk
Startup
Sleep
1/2 Bit
:
:
:
Bit check ok
1/2 Bit
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.
5-bit word defined by Sleep0 to
Sleep4 in OPMODE register
Extension factor defined by
XSleep
according to table 9
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.
Clk
1/2 Bit
Std
. The baud-rate range is
Bit-check
Clk
1/2 Bit
. The baud-rate range
) and on the
Bit-check
Receiving mode
T5743N
XTO
9 (34)