ACE24C02A Datasheet, PDF (9/14 Pages) ACE Technology Co., LTD. – Two-wire Serial EEPROM

Technology
ACE24C02A
Two-wire Serial EEPROM
Random Read:
A random read requires a “dummy” byte write sequence to load in the data word address. Once the
device address word and data word address are clocked in and acknowledged by the EEPROM, the
microcontroller must generate another start condition. The microcontroller now initiates a current
address read by sending a device address with the read/write select bit high. The EEPROM
acknowledges the device address and serially clocks out the data word. The microcontroller does not
respond with a zero but does generate a following stop condition (refer to Figure 11).
Sequential Read:
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. The sequential read operation is terminated when the
microcontroller does not respond with a zero but does generate a following stop condition (refer to
Figure 12).
MSB
LSB
1 0 1 0 x x x R/W
Figure 7．Device Address
Figure 8．Byte Write
Figure 9．Page Write
VER 1.2 9