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參數(shù)資料
| 型號： | DS2432X |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | Programmable ROM |
| 英文描述： | 1K X 1 1-WIRE SERIAL EEPROM, PBGA6 |
| 封裝： | UCSP-8 |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 168K |
| 代理商： | DS2432X |
Abridged Data Sheet
DS2432
10 of 14
Overdrive Match ROM [69h]
The Overdrive Match ROM command, followed by a 64-bit registration number transmitted at Overdrive
Speed, allows the bus master to address a specific DS2432 on a multidrop bus and to simultaneously set it
in Overdrive Mode. Only the DS2432 that exactly matches the 64-bit number will respond to the
subsequent memory or SHA function command. Slaves already in Overdrive mode from a previous
Overdrive Skip or a successful Overdrive Match command will remain in Overdrive mode. All Over-
drive-capable slaves will return to regular speed at the next Reset Pulse of minimum 480 s duration. The
Overdrive Match ROM command can be used with a single or multiple devices on the bus.
Resume Command [A5h]
In a typical application the DS2432 needs to be accessed several times to write a full 32-byte page. In a
multidrop environment this means that the 64-bit registration number of a Match ROM command has to
be repeated for every access. To maximize the data throughput in a multidrop environment the Resume
Command function was implemented. This function checks the status of the RC bit and, if it is set,
directly transfers control to the Memory and SHA functions, similar to a Skip ROM command. The only
way to set the RC bit is through successfully executing the Match ROM, Search ROM or Overdrive
Match ROM command. Once the RC bit is set, the device can repeatedly be accessed through the Resume
Command function. Accessing another device on the bus will clear the RC bit, preventing two or more
devices from simultaneously responding to the Resume Command function.
1-WIRE SIGNALING
The DS2432 requires strict protocols to ensure data integrity. The protocol consists of four types of sig-
naling on one line: Reset Sequence with Reset Pulse and Presence Pulse, Write 0, Write 1 and Read Data.
Except for the presence pulse the bus master initiates all these signals. The DS2432 can communicate at
two different speeds, regular speed and Overdrive Speed. If not explicitly set into the Overdrive mode,
the DS2432 will communicate at regular speed. While in Overdrive Mode the fast timing applies to all
waveforms.
The initialization sequence required to begin any communication with the DS2432 is shown in Figure 10.
A Reset Pulse followed by a Presence Pulse indicates the DS2432 is ready to send or receive data. The
bus master transmits (TX) a reset pulse (tRSTL, minimum 480 s at regular speed, 48 s at Overdrive
Speed). The bus master then releases the line and goes into receive mode (RX). The 1-Wire bus is pulled
to a high state via the pull-up resistor. After detecting the rising edge on the data pin, the DS2432 waits
(tPDH, 15-60 s at regular speed, 2-6 s at Overdrive speed) and then transmits the Presence Pulse (tPDL,
60-240 s at regular speed, 8-24 s at Overdrive Speed). A Reset Pulse of 480 s or longer will exit the
Overdrive Mode returning the device to regular speed. If the DS2432 is in Overdrive Mode and the Reset
Pulse is no longer than 80 s the device will remain in Overdrive Mode.
相關(guān)PDF資料 |
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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2432X+ | 功能描述:電可擦除可編程只讀存儲(chǔ)器 RoHS:否 制造商:Atmel 存儲(chǔ)容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體: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:電可擦除可編程只讀存儲(chǔ)器 RoHS:否 制造商:Atmel 存儲(chǔ)容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體: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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