ATA3745P3-TGQY Atmel, ATA3745P3-TGQY Datasheet - Page 10

• Manufacturer Part Number: ATA3745P3-TGQY
• Description: IC UHF ASK/FSK RECEIVER 20SOIC
• Manufacturer: Atmel

Specifications of ATA3745P3-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 ~ 85°C
• Package / Case: 20-SOIC (0.300", 7.50mm Width)
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• 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: ATA3745P3-TGQYTR

5.2
10
Polling Mode
ATA3745
Most applications are dominated by two transmission frequencies: f
used in the USA, f
dent 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
following formulas for further reference:
According to
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
check by check as it is a statistical process. An average value for T
tion
consumption is I
the duty cycle of the active mode and can be calculated 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
T
depends on the actual bit rate and the number of bits (N
The following formula indicates how to calculate the preburst length.
T
I
Spoll
BR_Range =
Startup
Preburst
• USA applications
• European applications
• Other applications
(f
(f
(T
characteristic is given as a function of T
XTO
XTO
“Electrical Characteristics” on page
Clk
=
, T
I
------------------------------------------------------------------------------------------------------------
is dependent on f
Sleep
Soff
= 4.90625 MHz, MODE = L, T
= 6.76438 MHz, MODE = H, T
Sleep
Bitcheck
T
Sleep
while consuming low current of I
Figure 3-2 on page
and T
T
T
Sleep
Sleep
+ T
and the startup time of a connected microcontroller (T
S
BR_Range0:
BR_Range1:
BR_Range2:
BR_Range3:
= I
Send
Startup
Startup
+
+
I
Son
Son
T
= 433.92 MHz in Europe. In order to ease the usage of all T
Startup
. The average current consumption in polling mode is dependent on
, the receiver is not sensitive to a transmitter signal. To guarantee the
+ T
XTO
T
Bitcheck
+
Startup
and on the logical state of pin MODE. The electrical
T
Bitcheck
6, the receiver stays in polling mode in a continuous cycle of
T
T
T
T
+
+ T
XClk
XClk
XClk
XClk
T
Bitcheck
Start_ C
Clk
= 8
= 4
= 2
= 1
Clk
= 2.0383 µs)
= 2.0697 µs)
Clk
T
T
T
T
S
).
Clk
Clk
Clk
Clk
23. During T
= I
Soff
. During the start-up period, T
Bitcheck
Startup
) to be tested.
and T
Bitcheck
Bitcheck
Send
Start_µC
= 315 MHz is mainly
XClk
Bitcheck
. This period varies
is given in the sec-
is defined by the
). T
4901B–RKE–11/07
Startup
the current
Bitcheck
Clk
-depen-
, all sig-
Sleep
thus
,