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ACE24AC02A3DMTH Datenblatt(PDF) 5 Page - ACE Technology Co., LTD.

Teilenummer ACE24AC02A3DMTH
Bauteilbeschribung  Two-wire Serial EEPROM
Download  17 Pages
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Hersteller  ACE [ACE Technology Co., LTD.]
Direct Link  http://www.ace-ele.com
Logo ACE - ACE Technology Co., LTD.

ACE24AC02A3DMTH Datenblatt(HTML) 5 Page - ACE Technology Co., LTD.

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ACE24AC02A3
Two-wire Serial EEPROM
VER 1.3
5
Device Addressing
The 2-wire serial bus protocol mandates an 8 bits device address word after a start bit condition to
invoke valid read or write command. The first four most significant bits of the device address must be
1010, which is common to all serial EEPROM devices. The next three bits are device address bits. These
three device address bits (5
th, 6th and 7th) are not cared and could be coded from 000 (b) to 111 (b). Only
one ACE24AC02A3 device can be used on the on 2-wire bus. If a match is made, the EEPROM device
outputs an acknowledge signal after the 8
th read/write bit, otherwise the chip will go into standby mode.
The last or 8th bit is a read/write command bit. If the 8th bit is at VIH then the chip goes into read mode.
If a “0” is detected, the device enters programming mode.
Write Operations
A.
Byte Write
A byte write operation starts when a micro-controller sends a start bit condition, follows by a proper
EEPROM device address and then a write command. If the device address bits match the chip
select address, the EEPROM device will acknowledge at the 9
th clock cycle. The micro-controller will
then send the rest of the lower 8 bits word address. At the 18
th cycle, the EEPROM will acknowledge
the 8-bit address word. The micro-controller will then transmit the 8 bit data. Following an
acknowledge signal from the EEPROM at the 27
th clock cycle, the micro-controller will issue a stop
bit. After receiving the stop bit, the EEPROM will go into a self-timed programming mode during
which all external inputs will be disabled. After a programming time of TWC, the byte programming will
finish and the EEPROM device will return to the standby mode.
B.
Page Write
A page write is similar to a byte write with the exception that one to sixteen bytes can be
programmed along the same page or memory row. All ACE24AC02A3 are organized to have 16
bytes per memory row or page.
With the same write command as the byte write, the micro-controller does not issue a stop bit after
sending the 1
st byte data and receiving the acknowledge signal from the EEPROM on the 27th clock
cycle. Instead it sends out a second 8-bit data word, with the EEPROM acknowledging at the 36
th
cycle. This data sending and EEPROM acknowledging cycle repeats until the micro-controller sends
a stop bit after the n × 9
th clock cycle. After which the EEPROM device will go into a self- timed partial
or full page programming mode. After the page programming completes after a time of TWC, the
devices will return to the standby mode.
The least significant 4 bits of the word address (column address) increments internally by one after
receiving
each data word. The rest of the word address bits (row address) do not change internally,
but pointing to a specific memory row or page to be programmed. The first page write data word can
be of any column address. Up to 16 data words can be loaded into a page.
If more then 16 data


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