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參數(shù)資料
| 型號： | AT24C02B_0701 |
| 廠商： | Atmel Corp. |
| 英文描述： | Two-wire Automotive Temperature Serial EEPROM |
| 中文描述： | 兩線串行EEPROM汽車溫度 |
| 文件頁數(shù)： | 9/17頁 |
| 文件大?。?/td> | 511K |
| 代理商： | AT24C02B_0701 |
9
AT24C02B [Preliminary]
5181B–SEEPR–1/07
Device Addressing
The 2K EEPROM device requires an 8-bit device address word following a start condi-
tion to enable the chip for a read or write operation (see to Figure 8 on page 10).
The device address word consists of a mandatory “1”, “0” sequence for the first four
most significant bits as shown. This is common to all the Serial EEPROM devices.
The next 3 bits are the A2, A1 and A0 device address bits for the 2K EEPROM. These 3
bits must compare to their corresponding hardwired input pins.
The eighth bit of the device address is the read/write operation select bit. A read opera-
tion is initiated if this bit is high and a write operation is initiated if this bit is low.
Upon a compare of the device address, the EEPROM will output a “0”. If a compare is
not made, the chip will return to a standby state.
Write Operations
BYTE WRITE:
A write operation requires an 8-bit data word address following the
device address word and acknowledgment. Upon receipt of this address, the EEPROM
will again respond with a “0” and then clock in the first 8-bit data word. Following receipt
of the 8-bit data word, the EEPROM will output a “0” and the addressing device, such as
a microcontroller, must terminate the write sequence with a stop condition. At this time
the EEPROM enters an internally timed write cycle, t
WR
, to the nonvolatile memory. All
inputs are disabled during this write cycle and the EEPROM will not respond until the
write is complete (see Figure 9 on page 10).
PAGE WRITE:
The 2K EEPROM is capable of an 8-byte page write.
A page write is initiated the same as a byte write, but the microcontroller does not send
a stop condition after the first data word is clocked in. Instead, after the EEPROM
acknowledges receipt of the first data word, the microcontroller can transmit up to seven
data words. The EEPROM will respond with a “0” after each data word received. The
microcontroller must terminate the page write sequence with a stop condition (see Fig-
ure 10 on page 11).
The data word address lower three bits are internally incremented following the receipt
of each data word. The higher data word address bits are not incremented, retaining the
memory page row location. When the word address, internally generated, reaches the
page boundary, the following byte is placed at the beginning of the same page. If more
than eight data words are transmitted to the EEPROM, the data word address will “roll
over” and previous data will be overwritten.
ACKNOWLEDGE POLLING:
Once the internally timed write cycle has started and the
EEPROM inputs are disabled, acknowledge polling can be initiated. This involves send-
ing a start condition followed by the device address word. The read/write bit is
representative of the operation desired. Only if the internal write cycle has completed
will the EEPROM respond with a “0”, allowing the read or write sequence to continue.
Read Operations
Read operations are initiated the same way as write operations with the exception that
the read/write select bit in the device address word is set to “1”. There are three read
operations: current address read, random address read and sequential read.
CURRENT ADDRESS READ:
The internal data word address counter maintains the
last address accessed during the last read or write operation, incremented by one. This
address stays valid between operations as long as the chip power is maintained. The
address “roll over” during read is from the last byte of the last memory page to the first
byte of the first page. The address “roll over” during write is from the last byte of the cur-
rent page to the first byte of the same page.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AT24C02B_07 | Two-wire Serial EEPROM |
| AT24C02B | Non-Insulated Block Fork |
| AT24C02B-10PU-1.8 | Two-wire Serial EEPROM |
| AT24C02B-10TSU-1.8 | Two-wire Serial EEPROM |
| AT24C02B-10TU-1.8 | Two-wire Serial EEPROM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT24C02B-10PU-1.8 | 制造商:Atmel Corporation 功能描述:EEPROM Serial-2Wire 2K-bit 256 x 8 2.5V/3.3V/5V 8-Pin PDIP 制造商:Atmel Corporation 功能描述:256 X 8 I2C/2-WIRE SERIAL EEPROM, PDIP8 |
| AT24C02B10SU18 | 制造商:Atmel Corporation 功能描述: |
| AT24C02B-10TSU-1.8 | 制造商:Atmel Corporation 功能描述:EEPROM Serial-2Wire 2K-Bit 256 x 8 2.5V/3.3V/5V 5-Pin SOT-23 |
| AT24C02B-10TU 1.8 SL383 | 制造商:Atmel Corporation 功能描述:EEPROM Serial-2Wire 2K-bit 256 x 8 2.5V/3.3V/5V 8-Pin TSSOP T/R |
| AT24C02B-10TU-1.8 | 制造商:Atmel Corporation 功能描述:EEPROM Serial-2Wire 2K-bit 256 x 8 2.5V/3.3V/5V 8-Pin TSSOP |
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