ATA5746-PXQW Atmel, ATA5746-PXQW Datasheet - Page 23

• Manufacturer Part Number: ATA5746-PXQW
• Description: IC RCVR ASK/FSK UHF 24-QFN
• Manufacturer: Atmel

Specifications of ATA5746-PXQW

• Frequency: 315MHz
• Sensitivity: -114dBm
• Data Rate - Maximum: 10 kbps
• Modulation Or Protocol: ASK, FSK
• Applications: Alarm and Security Systems, RKE, TPMS
• Current - Receiving: 6.7mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 2.7 V ~ 3.3 V, 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 24-VQFN Exposed Pad, 24-HVQFN, 24-SQFN, 24-DHVQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Memory Size: -

6. Bit Rate Ranges
Table 6-1.
Table 6-2.
4596B–RKE–06/07
Note:
Notes:
BR1
BR1
0
0
1
1
0
0
1
1
If during the start-up period (T
to noise on pin DATA_OUT.
1. As can be seen, a bit stream of, for example, 2.5 Kbits/s can be received in BR_Range0 and BR_Range1 (overlapping
2. The receiver is also capable of receiving non-Manchester-modulated signals, such as PWM, PPM, VPWM, NRZ. In ASK
3. To ensure an accurate settling of the data filter during the start-up period (
BR0
BR0
0
1
0
1
0
1
0
1
BR_Ranges). To get the full sensitivity, always use the lowest possible BR_Range (here, BR_Range0). The advantage in
the next higher BR_Range (BR_Range1) is the shorter start-up period, meaning lower current consumption during Polling
mode. Thus, it is a decision between sensitivity and current consumption.
mode, the header and blanking periods occurring in Keeloq-like protocols (up to 52 ms) are supported.
time T
BR Ranges ASK
BR Ranges FSK
BR_Range0
BR_Range1
BR_Range2
BR_Range3
BR_Range0
BR_Range1
BR_Range2
BR_Range3
BR_Range
BR_Range
EE
of the data signal (preamble) must be inside the given limits during this period.
Configuration of the bit rate ranges is carried out via the two pins BR0 and BR1. The microcon-
troller uses these two interface lines to set the corner frequencies of the band-pass data filter.
Switching the bit rate ranges while the RF front end is in Active mode can be done on the fly and
will not take longer than 100 µs if done while remaining in either ASK or FSK mode. If the modu-
lation scheme is changed at the same time, the switching time is (T
on page
sitivity of the receiver, edge-to-edge transition times of incoming data should not be less than the
minimum for the selected BR_Range.
Recommended Bit Rate
4.0 Kbits/s to 10.0 Kbits/s
8.0 Kbits/s to 10.0 Kbits/s
Recommended Bit Rate
4.0 Kbits/s to 10.0 Kbits/s
8.0 Kbits/s to 20.0 Kbits/s
2.0 Kbits/s to 5.0 Kbits/s
2.0 Kbits/s to 5.0 Kbits/s
1.0 Kbit/s to 2.5 Kbits/s
1.0 Kbit/s to 2.5 Kbits/s
25). Each BR_Range is defined by a minimum edge-to-edge time. To maintain full sen-
Startup_PLL
(Manchester)
(Manchester)
+ T
Startup_Sig_Proc
(1)
(1)
) there is no RF signal, the data filter settles to the noise floor, leading
Time Period T
Time Period T
ATA5745/ATA5746 [Preliminary]
Minimum Edge-to-edge
Minimum Edge-to-edge
Signal
Signal
200 µs
100 µs
200 µs
100 µs
50 µs
50 µs
50 µs
25 µs
EE
EE
(2)
(2)
of the Data
of the Data
T
Startup_PLL
the Data Signal During the Start-up
the Data Signal During the Start-up
+
Edge-to-edge Time Period T
Edge-to-edge Time Period T
T
Startup_Sig_Proc
Startup_Sig_Proc
200 µs to 500 µs
100 µs to 250 µs
200 µs to 500 µs
100 µs to 250 µs
50 µs to 62.5 µs
25 µs to 62.5 µs
50 µs to 125 µs
50 µs to 125 µs
Period
Period
), the edge-to-edge
, see
(3)
(3)
Figure 7-1
EE
EE
of
of
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