ATAB-LFMB-78 Atmel, ATAB-LFMB-78 Datasheet - Page 3

• Manufacturer Part Number: ATAB-LFMB-78
• Description: MAINBOARD LF W/AVR FOR ATA5278
• Manufacturer: Atmel
• Series: Smart RFr
• Type: LF Mainboardr

Specifications of ATAB-LFMB-78

• Frequency: 125kHz
• For Use With/related Products: ATA5278
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: ATAB-LFMB78

3.1
4894B–AUTO–06/06
Transmitter Board ATAB5278
The transmitter board is plugged into the baseboard via header pin connectors controlled by the
AVR
In accordance with the features provided by the IC, the board is equipped with a choke for the
boost converter needed to achieve a wide range of antenna current regulation independent of
battery voltage and antenna impedance.
Thanks to the patented Quick Start Control (QSC) feature of the IC, the antenna current can be
switched on and off without a slope of the magnetic field, independent of the selected antenna Q
factor. Therefore, the board is fitted with an additional high voltage (600V) MOS transistor, T1,
switching the antenna loop on and off, synchronized by zero cross detection. Comparisons of
data transmission, with and without QSC, are shown by
on page
Generating a fixed antenna driver frequency of 125 kHz, the IC is operated with a stable 8 MHz
resonator oscillator. A programmable clock output (8 MHz/4 MHz) is provided on the header pin
for external use. The clock can be disconnected from the header using jumper J3. For the appli-
cation kit, an external antenna module
high-voltage and high-power components from the transmitter board. But, for development pur-
poses, the components for antenna matching can also be placed on the transmitter board, so
the pure antenna coil may be connected by the antenna plug. Therefore, the jumpers J1 and J2
have to be opened to release Cant and Rant, matching the resonant frequency and Q factor of
the antenna.
With the contained antenna module, the maximum driver ability (1A
achieved. The hardware reset of the IC (NRES) is selectable by S1 from two baseboard
controls:
• System reset NRESET
• Port PA5
®
microcontroller on the baseboard through the SPI interface.
19.
ATAK5278-82 LF Wake-up Demonstrator
S1 position x2_2 (default setting)
S1 position x1_13
(Figure 3-3 on page
Figure 6-7 on page 18
5) is used, excluding the
p
) of the transmitter can be
and
Figure 6-8
3