ATAB5749-3 Atmel, ATAB5749-3 Datasheet - Page 2

• Manufacturer Part Number: ATAB5749-3
• Description: BOARD XMITTER FOR 315MHZ ATA5749
• Manufacturer: Atmel
• Type: Transmitterr

Specifications of ATAB5749-3

• Frequency: 315MHz
• For Use With/related Products: ATAB5749
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1. Delivery Status of the Transmitter Board
1.1
2
Hardware
ATAB5749
The front and the rear view of the transmitter board are illustrated in
schematic of the board is shown in
showed in
board is listed in
The board contains the following parts:
Note:
Note:
Note:
• Lithium battery
• Transmitter matched to the loop antenna.
• AVR
• An external microcontroller can be used to set the ATA5749 on the boards since some test
• Three buttons are available.
• Two Light Emitting Diodes are available to show the activity status of the board. The LED 1
points are placed on the control and the programming traces of ATA5749.
indicates that the calibration of the internal RC oscillator of ATmega88 exceeds the defined
tolerance limits in the software of ATmega88. LED 2 indicates the transmit functions of the
transmitter board.
®
1. Atmel offer 2 different demo boards for the ATA5749 due to the Loop Antenna matching,
The connection between the ATmega88 and ATA5749 can be disconnected by desoldering the
jumpers (BR1 to BR4). (See the schematic of the board in
The internal RC oscillator is always calibrated internally when any button is pushed. In case that
no exact calibration value can be calculated, the closest value will be taken.
A short flash of the LED 2 indicates the start of the function “Single Telegram” or “Single Pat-
tern” when a button is pressed. The same indicator can be also recognized for start and end of
any continuous functionality like “Continuous Telegram”, “Continuous Pattern”, etc.
ATmega88 is used on the board for programming
Figure 1-3 on page 5
matching to the 315 MHz and 433.92 MHz.
Generally the ATA5749 can be set in both 315 MHz and 433.92 MHz transmit frequency with
one 13.0 MHz crystal. So the 315 MHz board can be reprogrammed for 433.92 MHz trans-
mitting purposes. In this case the matching elements must be changed to get the optimal
transmit power.
Verification with 50 matching is possible.
Table 1-1 on page
to
Figure 1-5 on page
Figure 1-2 on page
6.
6. The bill of material of the transmitter
4, and the board layout information is
Figure 1-2 on page
Figure 1-1 on page
4.)
9138A–AUTO–12/08
3. The