HN58X2402SFPIAG Datasheet, PDF (14/18 Pages) Renesas Technology Corp – Two-wire serial interface 2k EEPROM (256-word × 8-bit) 4k EEPROM (512-word × 8-bit)

HN58X2402SFPIAG/HN58X2404SFPIAG
Random Read:
This is a read operation with defined read address. A random read requires a dummy write to set read address. The
EEPROM receives a start condition, device address word(R/W=0) and memory address sequentially. The EEPROM
outputs acknowledgment “0” after receiving memory address then enters a current address read with receiving a start
condition. The EEPROM outputs the read data of the address which was defined in the dummy write operation. After
receiving acknowledgment “1”(no acknowledgment) and a following stop condition, the EEPROM stops the random
read operation and returns to a standby state.
Random Read Operation
2k, 4k
Start
Device
address
@@@
1010
W
Memory
address (n)
ACK
R/W
Dummy write
Device
address
###
1010
R
Read data (n)
Start
ACK
ACK No ACK
R/W
Stop
Currect address read
Note: 1. 2nd device address code (#) should be same as 1st (@).
Sequential Read:
Sequential reads are initiated by either a current address read or a random read. If the EEPROM receives
acknowledgment “0” after 8-bit read data, the read address is incremented and the next 8-bit read data are coming out.
This operation can be continued as long as the EEPROM receives acknowledgment “0”. The address will roll over and
returns address zero if it reaches the last address of the last page. The sequential read can be continued after roll over.
The sequential read is terminated if the EEPROM receives acknowledgment “1” (no acknowledgment) and a following
stop condition.
Sequential Read Operation
2k, 4k
Start
Device
address
1010
Read data (n) Read data (n+1) Read data (n+2) Read data (n+m)
R
ACK
R/W
ACK
ACK ACK
No ACK
Stop
Rev.4.00, Jul.13.2005, page 14 of 16