Atmel 556-ATREB212BSMA-EK, Hardware User Manual

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AT02876: Atmel REB212BSMA Hardware User Manual [APPLICATION NOTE]
Atmel-42097B-WIRELESS-AT02876-REB212BSMA-Hardware-User-Manual_ApplicationNote_062014
7
Address Name Type Description
0x14 Feature uint8 Board features, coded into seven bits
7 Reserved
6 Reserved
5 External LNA
4 External PA
3 Reserved
2 Diversity
1 Antenna
0 SMA connector
0x15 Cal OSC 16MHz uint8 XTAL calibration value, register XTAL_TRIM
0x16 Cal RC 3.6V uint8 Atmel ATmega1281 internal RC oscillator calibration value @ 3.6V, register
OSCCAL
0x17 Cal RC 2.0V uint8 Atmel ATmega1281 internal RC oscillator calibration value @ 2.0V, register
OSCCAL
0x18 Antenna gain int8 Antenna gain [resolution 1/10dBi].
For example, 15 will indicate a gain of 1.5dBi.
The values 00h and FFh are per definition invalid. Zero or
-0.1dBi has to be indicated as 01h or FEh
0x20 Board name char[30] Textual board description
0x3E CRC uint16
16-bit CRC checksum, standard ITU-T generator polynomial G16(x) = x16 +
x12 + x5 + 1
Example: EEPROM dump.
0000 D0 63 17 FF FF 25 04 00 DC 25 00 00 4E 00 00 00 .c...%...%..N...
0010 00 05 00 03 02 00 86 86 00 FF FF FF FF FF FF FF ................
0020 52 61 64 69 6F 45 78 74 65 6E 64 65 72 32 31 32 RadioExtender212
0030 42 53 4D 41 00 00 00 00 00 00 00 00 00 00 2B D5 BSMA..........+.
0040 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF ................
0050 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF ................
0060 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF ................
0070 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF ................
4.3 Supply Current Sensing
A jumper, JP1, is placed in the supply voltage trace to offer an easy way for current sensing. The current
consumption of all circuitry connected to the supply domains DEVDD/EVDD such as AT86RF212B and
AT25010B can be measured by connecting an ampere meter instead of the jumper cap JP1, see Figure 4-3 .
The power supply pins of the radio transceiver are protected against overvoltage and reverse polarity at the X1
connector pins (net CVTG, net DGND) using a Zener diode, D1, and a thermal fuse, F1, (see Appendix A ). This
is required because the Atmel STK500 will provide 5V as default voltage, and the board can also be mounted
with reverse polarity.
Depending on the actual supply voltage, the diode D1 can consume several milliamperes. This has to be
considered when the current consumption of the whole system is measured. In such a case, D1 should be
removed from the board.
To achieve the best RF performance, the analog (EVDD) and digital (DEVDD) supply are separated from each
other by a CLC PI-filter.