Artesyn COMX-P1022 Installation and Use (July 2014) - Manual (Page 61)

Functional Description
COMX-P1022 COM Express Module Installation and Use (6806800M04C) 61
4.6.2 I2C EEPROM
The I2C EEPROM AT24C02B is located on I2C#1. It is used for board information storage (such
as MAC Address, board ID etc) or for other purposes.
The EEPROM provides 2048 bits of serial electrically erasable and programmable read-only
memory (EEPROM) organized as 256 words of 8 bits each. The device address is 0xA0, it can be
accessed only at I2C#1.
AT24C02 support SEQUENTIAL READ and page write.
Sequential reads are initiated by either a current address read or a random address read. After
the microcontroller receives a data word, it responds with an acknowledge. As long as the
EEPROM receives an acknowledge, it will continue to increment the data word address and
serially clock out sequential data words. When the memory address limit is reached, the data
word address will "roll over" and the sequential read will continue.
AT24C02's 32K EEPROM was internally organized with 32 pages of 8 bytes each. A page write is
initiated the same as a byte write, but the microcontroller does not send a stop condition after
the first data word is clocked in. Instead, after the EEPROM acknowledges receipt of the first
data word, the microcontroller can transmit up to seven more data words.
4.6.3 I2C Device - Thermal Sensor
The thermal sensor ADT7461 is a dual-channel digital thermometer and under/over
temperature alarm, intended for use in PCs and thermal management systems. It is located on
I2C#2. The device address is 0x98. It is designed for monitoring P1022 processor temperature.
Table 4-2 I2C#2 Address Distribution
IIC2 ADDRESS
ADT7461 0X98
DDR3 0XA6 0X66 0x36
RTC 0XD0
IIC MUX 0XE0
TFP410 0X72