AT02876: Atmel REB212BSMA Hardware User Manual [APPLICATION NOTE]
Atmel-42097B-WIRELESS-AT02876-REB212BSMA-Hardware-User-Manual_ApplicationNote_062014
6
Pin#
Function
Pin#
Function
31
PD7 (SLPTR)
32
PD6 (DIG2)
33
PD5 (TP2)
34
PD4 (open)
35
PD3 (TP3)
36
PD2 (IRQ)
37
PD1 (TP4)
38
PD0 (open)
39
GND
40
EE#WP (write protect EEPROM)
Note: 1. Possible by retrofitting a 0R assembly.
4.2 ID EEPROM
To identify the board type by software, an identification (ID) EEPROM (U5) is populated. Information about the
board, the node MAC address and production calibration values are stored here. A serial EEPROM AT25010B
with 128 × 8-bit organization and SPI bus is used because of its small package and low-voltage and
low-power operation.
The SPI bus is shared between the EEPROM and the transceiver. The select signal for each SPI slave
(EEPROM, radio transceiver) is decoded with the reset line of the transceiver, RSTN. Therefore, the EEPROM is
addressed when the radio transceiver is held in reset (RSTN = 0; see
Figure 4-2.
EEPROM Access Decoding Logic (Atmel ATmega1281 Configuration)
The EEPROM data is written during board production testing. A unique serial number, the MAC address, and
calibration values are stored. These can be used to optimize system performance.
description of the EEPROM data structure.
Table 4-3.
ID EEPROM Mapping
Address
Name
Type
Description
0x00
MAC address
uint64
MAC address for the 802.15.4 node, little endian byte order
0x08
Serial number
uint64
Board serial number, little endian byte order
0x10
Board family
uint8
Internal board family identifier
0x11
Revision
uint8[3]
Board revision number ##.##.##
>
1
>
1
PB
5
(
RSTN
)
SPI
PB
1
..
3
(
SPI
)
Transceiver
AT86RF212B
ID EEPROM
PB
0
(
SEL
)
RSTN
SELN
#CS
