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參數(shù)資料
| 型號： | AT24C256Y4-10YU-1.8 |
| 廠商： | ATMEL CORP |
| 元件分類： | PROM |
| 英文描述： | 32K X 8 I2C/2-WIRE SERIAL EEPROM, DSO8 |
| 封裝： | 6 X 4.90 MM, GREEN, SOIC-8 |
| 文件頁數(shù)： | 3/23頁 |
| 文件大?。?/td> | 362K |
| 代理商： | AT24C256Y4-10YU-1.8 |
11
AT24C128/256
0670T–SEEPR–3/07
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 one. 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.
Once the device address with the read/write select bit set to one is clocked in and acknowl-
edged by the EEPROM, the current address data word is serially clocked out. The
microcontroller does not respond with an input zero but does generate a following stop condi-
tion (see Figure 10 on page 12).
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 fol-
lowing stop condition (see Figure 11 on page 12).
SEQUENTIAL READ: Sequential reads are initiated by either a current address read or a ran-
dom 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 con-
tinue. The sequential read operation is terminated when the microcontroller does not respond
with a zero but does generate a following stop condition (see Figure 12 on page 12).
Figure 7. Device Address
Figure 8. Byte Write
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT24C32-10PC | 制造商:Atmel Corporation 功能描述:Serial EEPROM, 4K x 8, 8 Pin, Plastic, DIP |
| AT24C32-10PC-1.8 | 功能描述:IC EEPROM 32KBIT 400KHZ 8DIP 制造商:microchip technology 系列:- 包裝:管件 零件狀態(tài):停產(chǎn) 存儲器類型:非易失 存儲器格式:EEPROM 技術(shù):EEPROM 存儲容量:32Kb （4K x 8） 時鐘頻率:400kHz 寫周期時間 - 字，頁:10ms 訪問時間:900ns 存儲器接口:I2C 電壓 - 電源:1.8 V ~ 5.5 V 工作溫度:0°C ~ 70°C（TA） 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商器件封裝:8-PDIP 基本零件編號:AT24C32 標(biāo)準(zhǔn)包裝:50 |
| AT24C32-10PC-2.5 | 功能描述:IC EEPROM 32KBIT 400KHZ 8DIP 制造商:microchip technology 系列:- 包裝:管件 零件狀態(tài):停產(chǎn) 存儲器類型:非易失 存儲器格式:EEPROM 技術(shù):EEPROM 存儲容量:32Kb （4K x 8） 時鐘頻率:400kHz 寫周期時間 - 字，頁:10ms 訪問時間:900ns 存儲器接口:I2C 電壓 - 電源:2.5 V ~ 5.5 V 工作溫度:0°C ~ 70°C（TA） 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商器件封裝:8-PDIP 基本零件編號:AT24C32 標(biāo)準(zhǔn)包裝:50 |
| AT24C32-10PC-2.7 | 制造商:Atmel Corporation 功能描述:Serial EEPROM, 4K x 8, 8 Pin, Plastic, DIP |
| AT24C32-10PI | 制造商:Atmel Corporation 功能描述:4K X 8 I2C/2-WIRE SERIAL EEPROM, PDIP8 |
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