ATA3742P3-TGQY Atmel, ATA3742P3-TGQY Datasheet - Page 12

• Manufacturer Part Number: ATA3742P3-TGQY
• Description: IC UHF ASK/FSK RECEIVER 20SOIC
• Manufacturer: Atmel

Specifications of ATA3742P3-TGQY

• Frequency: 310MHz ~ 440MHz
• Sensitivity: -108dBm
• Data Rate - Maximum: 10 kBaud
• Modulation Or Protocol: ASK, FSK
• Applications: RKE, TPM, Security Systems
• Current - Receiving: 7mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 20-SOIC (0.300", 7.50mm Width)
• Operating Frequency (max): 450000kHz
• Operating Temperature (min): -40C
• Operating Temperature (max): 105C
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Memory Size: -
• Lead Free Status / Rohs Status: Compliant
• Other names: ATA3742P3-TGQYTR

5.2
12
Polling Mode
ATA3742
Most applications are dominated by two transmission frequencies: f
used in the USA, f
parameters, the electrical characteristics display three conditions for each parameter.
The clock cycle of some function blocks depends on the selected baud rate range (BR_Range)
which is defined in the OPMODE register. This clock cycle T
mulas for further reference:
As seen in
three different modes. In sleep mode, the signal processing circuitry is disabled for the time
period T
nal processing circuits are enabled and settled. In the following bit-check mode, the incoming
data stream is analyzed bit by bit, looking for a valid transmitter signal. If no valid signal is
present, the receiver is set back to sleep mode after the period T
by check as it is a statistical process. An average value for T
acteristics. During T
consumption in polling mode is dependent on the duty cycle of the active mode and can be cal-
culated as:
During T
reception of a transmitted command, the transmitter must start the telegram with an adequate
preburst. The required length of the preburst is dependent on the polling parameters T
tup
depends on the actual bit rate and the number of bits (N
The following formula indicates how to calculate the preburst length.
T
I
BR_Range =
Spoll
Preburst
• Application USA (f
• Application Europe (f
• Other applications (T
, T
electrical characteristic is given as a function of T
Bitcheck
=
I
------------------------------------------------------------------------------------------------------------
Soff
Sleep
Sleep
T
Sleep
Figure 5-3 on page
and the startup time of a connected microcontroller (T
while consuming low current of I
T
and T
T
Sleep
Sleep
+ T
BR_Range0:
BR_Range1:
BR_Range2:
BR_Range3:
Send
Startup
+
Startup
Startup
+
I
XTO
Son
T
= 433.92 MHz in Europe. In order to ease the usage of all T
Startup
XTO
Clk
, the receiver is not sensitive to a transmitter signal. To guarantee the
+ T
= 4.90625 MHz, MODE = L, T
and T
is dependent on f
T
= 6.76438 MHz, MODE = H, T
Bitcheck
+
Startup
T
Bitcheck
Bitcheck
15, the receiver stays in polling mode in a continuous cycle of
T
T
T
T
XClk
XClk
XClk
XClk
+
+ T
T
Bitcheck
= 8
= 4
= 2
= 1
Start_microcontroller
the current consumption is I
T
T
T
T
XTO
Clk
Clk
Clk
Clk
S
= I
and on the logical state of pin MODE. The
Soff
Clk
. During the start-up period, T
).
Clk
Bitcheck
= 2.0383 µs)
Clk
Bitcheck
= 2.0697 µs)
XClk
) to be tested.
Bitcheck
is defined by the following for-
is given in the electrical char-
S
Start,microcontroller
= I
Send
. This period varies check
Son
. The average current
= 315 MHz is mainly
). T
Clk
4900B–RKE–11/07
Startup
-dependent
Bitcheck
Sleep
, all sig-
, T
thus
Star-