FM24C02B Shanghai Fudan Microelectronics Co., Ltd., FM24C02B Datasheet - Page 8

• Manufacturer Part Number: FM24C02B
• Description: 2-wire Serial Eeprom
• Manufacturer: Shanghai Fudan Microelectronics Co., Ltd.

Device Operation
CLOCK and DATA TRANSITIONS: The SDA pin is
normally pulled high with an external device. Data on
the SDA pin may change only during SCL low time
periods (refer to Figure 4). Data changes during
SCL high periods will indicate a start or stop
condition as defined below.
START CONDITION: A high-to-low transition of SDA
with SCL high is a start condition which must
precede any other command (refer to Figure 5).
STOP CONDITION: A low-to-high transition of SDA
with SCL high is a stop condition. After a read
sequence, the stop command will place the EEPROM
in a standby power mode (refer to Figure 5).
ACKNOWLEDGE: All addresses and data words are
serially transmitted to and from the EEPROM in 8-bit
words. The EEPROM sends a zero to acknowledge
that it has received each word. This happens
during the ninth clock cycle. Following receipt each
Bus Timing
Figure 2．SCL: Serial Clock, SDA: Serial Data I/O
FM24C02B/04B/08B/16B 2-Wire Serial EEPROM
SDA
OUT
SCL
SDA
IN
t
SU.STA
t
HD.STA
t
LOW
t
F
t
AA
t
HD.DAT
t
HIGH
t
LOW
word from the EEPROM, the microcontroller should
send a zero to EEPROM and continue to output the
next data word or send a stop condition to finish the
read cycle.
STANDBY MODE: The FM24C02B/04B/08B/16B
features a low-power standby mode which is enabled:
(a) upon power-up and (b) after the receipt of the
stop bit and the completion of any internal
operations.
DEVICE RESET: After an interruption in protocol,
power loss or system reset, any 2-wire part can be
reset in following these steps:
1. Clock up to 9 Cycles,
2. Look for SDA high in each cycle while SCL is
3. Create a start condition as SDA is high.
Ver 1.6
high and then,
t
t
SU.DAT
DH
t
R
Data Sheet
t
SU.STO
t
BUF
8