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参数资料
| 型号： | DS2432X |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | Programmable ROM |
| 英文描述： | 1K X 1 1-WIRE SERIAL EEPROM, PBGA6 |
| 封装： | UCSP-8 |
| 文件页数： | 12/16页 |
| 文件大小： | 168K |
| 代理商： | DS2432X |
Abridged Data Sheet
DS2432
5 of 14
WRITING WITH VERIFICATION
To write data to the DS2432, the scratchpad has to be used as intermediate storage. First the master issues
the Write Scratchpad command to specify the desired target address, followed by the data to be written to
the scratchpad. Note that writes to data memory must be performed on 8-byte boundaries with the
3 LSBs of the target address (T2..T0) equal to 000b. If T2..T0 are sent with non-zero values, the device
will set these bits to zero and will write to the modified address upon completion of the command
sequence.
In addition, the entire 8-byte scratchpad will be copied to memory when commanded,
therefore eight bytes of data should be written into the scratchpad to ensure that the data to be copied is
known. Under certain conditions (see Write Scratchpad command) the master will receive an inverted
CRC16 of the command, address (actual address sent) and data at the end of the write scratchpad
command sequence. Note that the CRC is calculated based on the actual target address sent and not the
modified address in the case of a non-zero T2..T0. Knowing this CRC value, the master can compare it
to the value it has calculated itself to decide if the communication was successful and proceed to the
Copy Scratchpad command. If the master could not receive the CRC16, it should send the Read
Scratchpad command to verify data integrity. As preamble to the scratchpad data, the DS2432 repeats the
target address TA1 and TA2 and sends the contents of the E/S register. If the PF flag is set, data did not
arrive correctly in the scratchpad or there was a loss of power since data was last written to the
scratchpad. The master does not need to continue reading; it can start a new trial to write data to the
scratchpad. Similarly, a set AA flag together with a cleared PF flag indicates that the device did not
recognize the Write command. If everything went correctly, both flags are cleared. Now the master can
continue reading and verifying every data byte. After the master has verified the data, it can send the
Copy Scratchpad command, for example. This command must be followed exactly by the data of the
three address registers TA1, TA2 and E/S. The master should obtain the contents of these registers by
reading the scratchpad.
MEMORY AND SHA FUNCTION COMMANDS
This section describes the commands and flow charts to use the memory and SHA-1 engine of the device.
It includes Tables 1 to 4 and Figure 7. Please refer to the full version of the data sheet.
SHA-1 COMPUTATION ALGORITHM
The SHA computation is adapted from the Secure Hash Standard SHA-1 document as it can be
downloaded from the NIST web site (http://www.itl.nist.gov/fipspubs/fip180-1.htm). Further details are
found in the full version of the data sheet.
1-WIRE BUS SYSTEM
The 1-Wire bus is a system, which has a single bus master and one or more slaves. In all instances the
DS2432 is a slave device. The bus master is typically a microcontroller. The discussion of this bus system
is broken down into three topics: hardware configuration, transaction sequence, and 1-Wire signaling
(signal types and timing). A 1-Wire protocol defines bus transactions in terms of the bus state during
specific time slots that are initiated on the falling edge of sync pulses from the bus master.
相关PDF资料 |
PDF描述 |
|---|---|
| DS2432P | 1K X 1 1-WIRE SERIAL EEPROM, PDSO6 |
| DS2433 | 512 X 8 1-WIRE SERIAL EEPROM, PBCY3 |
| DS2433X | 4K X 1 1-WIRE SERIAL EEPROM, UUC2 |
| DS2433S | 512 X 8 1-WIRE SERIAL EEPROM, PDSO8 |
| DS2434S | SPECIALTY MEMORY CIRCUIT, PDSO16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2432X+ | 功能描述:电可擦除可编程只读存储器 RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 |
| DS2432X+U | 制造商:Maxim Integrated Products 功能描述:1-W EEPROM 1KB W/SHA-1 UCSP PARTIAL - Rail/Tube |
| DS2432X-101-4D+T | 制造商:Maxim Integrated Products 功能描述:1KB PROTECTED 1-WIRE EEPROM WITH SHA-1 ENGINE - Tape and Reel |
| DS2432X-S | 功能描述:电可擦除可编程只读存储器 RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 |
| DS2432X-S+ | 制造商:Maxim Integrated Products 功能描述:1-W EEPROM 1KB W/SHA-1 UCSP 2.5K TR - Tape and Reel |
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