The ATA8510 RF transceiver is placed on a key fob board.
The following figure illustrates the RF transceiver board. A CR2032 coin cell battery
(not included) powers this RF transceiver, which is mounted on the bottom of the board.
The user can use the SW1 and SW2 buttons on the ATAB8510 board for initiating data
telegram transmission. The LED flashes during a temperature measurement before
transmitting the RF data telegram.
The ISP connector helps the user to do the following:
Flash and EEPROM programming
Flash application debugging of
the ATA8510 RF transceiver
For more details about the Flash application development, refer to the ATA8510
Evaluation Kit (ATA8510-EK1) (ATA8510-EK1 Tool Package.zip)
and download the latest software from the Software section. Figure 4-2. Remote Sensor Board
(ATAB8510B)
Figure 4-3. Coin Cell Battery
(CR2032)
The following figure illustrates the details about remote sensor current
consumption:
Current consumption profile over
time
Current consumption for the
measurement period with and without LED
Indicates current consumption
measured at a room temperature of 24°C
During the temperature measurement period of 40 ms, the LED is switched ON in
parallel, increasing the current consumption. The RF telegram transmission takes about
11 ms at a power level of 6 dBm, resulting in current consumption of about 9.4 mA. In
OFF mode, the temperature sensor is switched OFF, and the resulting current is indicated
by the ATA8510 RF transceiver current consumption. This
OFF mode current is highly dependent on ambient temperature. For more details, refer to
the ATA8510/15 Industrial Data Sheet (DS70005505).
Figure 4-4. Remote Sensor Current Consumption at 24°C
The following table summarizes battery life for a CR2032 and CR2450 coin cell without
using the LED during temperature measurement at 20°C. The assumption is that the battery
voltage drops from the initial value of 3V to 2V by the end of battery service. The
manufacturer defines the self-discharge with typically 1% per year at an ambient
temperature of 20°C. The battery life for this application primarily depends on the
measurement interval Ts, which defines the duration of the OFF mode, whereas measurement
and Transmit mode have fixed durations.
Table 4-2. Battery Life at
20°C
Interval Ts (s)
Mean Current (mA)
Battery Lifetime
(Days/Years)
CR2032 (230 mAh)
CR2450 (560 mAh)
Days
Years
Days
Years
2
0.053
180
0.5
437
1.2
5
0.022
445
1.2
1083
3.0
10
0.011
875
2.4
2131
5.8
20
0.006
1696
4.6
4130
11.3
50
0.002
3880
10.6
9448
25.9
The online versions of the documents are provided as a courtesy. Verify all content and data in the device’s PDF documentation found on the device product page.
