2.5 LCD Module Identification With EEPROM

The 5" 4-Lane LVDS WVGA LCD Display Module kit embeds a 24AA014H 1-Kbit EEPROM used for LCD Module identification.

The Microchip 24AA014H is a 1-Kbit serial EEPROM with operation down to 1.7V. The device is organized as a single block of 128 x 8-bit memory with a 2-wire serial interface. Low-current design permits operation with maximum standby and active currents of only 1 μA and 400 μA, respectively. The device has a page write capability of up to 16 bytes of data.

For more details on the 24AA014H EEPROM memory, refer to additional resources.

Figure 2-4. 24AA014H Module Identification Schematic
Important: The 24AA014H EEPROM is accessible through the I²C bus at 0x53 address. No other components with the same I²C address can be connected on the same bus.
Important: It is recommended not to erase the data stored in the 24AA014H EEPROM. This data is necessary at system level for the LCD module identification.

The data contained is a 42-byte word described in the table below.

Table 2-1. EEPROM Memory Mapping
Byte(s) N°TypeInformationDefault Value
[0]DecimalNumber of bytes0x2A (42 bytes)
[5:2]ASCII String [4]Microchip division0x4D505520 (MPU )
[8:7]ASCII String [2]Manufacturer country0x434E (CN)
[21:10]ASCII String [12]Ordering code0x414336395438384120202020 (AC69T88A )
[32:23]ASCII String [10]Main device embeds0x53543732363220202020 (ST7262 )
[34]DecimalManufacturing code (year)0x16 (2022)
[35]DecimalManufacturing code (week)0x28 (Week 40)
[37]ASCII String [1]Hardware revision0x31 (Revision 1)
[39]ASCII String [1]Mapping revision0x41 (Revision A)
[41]Hexa DataCRC-8 checksumN/A
Note: Unspecified bytes are used as data separators and contain the value 0x2D.