ATA5745-EK Atmel, ATA5745-EK Datasheet - Page 26
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ATA5745-EK
Manufacturer Part Number
ATA5745-EK
Description
BOARD RCVR 433MHZ RKE/TPMS
Manufacturer
Atmel
Type
Receiver, ASK/FSKr
Specifications of ATA5745-EK
Frequency
433MHz ~ 435MHz
For Use With/related Products
ATA5745
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
8. Polling Current Calculation
26
ATA5745/ATA5746 [Preliminary]
Figure 8-1.
In an RKE and TPM system, the average chip current in Polling mode, I
parameter. The polling period must be controlled by the connected microcontroller via the pins
ENABLE and RX. The polling current can be calculated as follows:
I
(T
T
T
T
T
T
I
I
I
Example:-
Polling
Startup_PLL
Active
Standby
Polling_Period
Startup_PLL
Startup_Sig_Proc
Bitcheck
Polling_Period
ENABLE
Bitcheck
I
Supply
:
:
RX
= (T
:
:
/ T
:
Startup_PLL
:
Polling_Period
:
I
Polling Cycle
Standby
I
Active
/ T
depends on 315 MHz/433.92 MHz application.
depends on 315 MHz/433.92 MHz application and the selected bit
rate range.
depends on the signal bit rate (1 / Signal_Bit_Rate).
depends on the transmitter telegram (preburst).
depends on 3V or 5V application and the setting of pin CLK_OUT.
depends on 3V or 5V application, ASK or FSK mode and the setting of
pin CLK_OUT.
depends on 3V or 5V application and the setting of pin CLK_OUT.
315-MHz application (ATA5746), bit rate: 9.6 Kbits/s, T
--> T
--> T
--> T
3V application; ASK mode, CLK_OUT disabled
--> I
--> I
--> I
--> I
)
Polling_Period
Startup_PLL
Active
Standby
Polling
Startup_PLL
Startup_Sig_Proc
Bitcheck
T
T
T
I
Bitcheck
Startup_Sig_Proc
Startup_PLL
Active
= 0.545 mA
I
Standby
+ (T
(= 1 / Signal_Bitrate (average)
)
(Startup RF-PLL)
Polling_Period
I
Startup_PLL
(Startup Signal Processing)
=
=
=
=
=
=
– T
+ (T
Startup_PLL
269 µs
324 µs
104 µs
4.5 mA
6.5 mA
0.05 mA
Startup_Sig_Proc
I
Standby
– T
(Bit Rate Range 3)
Startup_Sig_Proc
/ T
Polling_Period
Polling
Polling_Period
, is an important
4596B–RKE–06/07
I
Active
– T
)
Bitcheck
= 8 ms
I
Active
) /
+