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參數(shù)資料
| 型號(hào)： | DS2432P |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Programmable ROM |
| 英文描述： | 1K X 1 1-WIRE SERIAL EEPROM, PDSO6 |
| 封裝： | 0.150 INCH, TSOC-6 |
| 文件頁(yè)數(shù)： | 20/30頁(yè) |
| 文件大?。?/td> | 165K |
| 代理商： | DS2432P |
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PRELIMINARY
DS2432
27 of 30
Read-data Time Slot
VPULLUP
VIH MIN
VPULLUP MIN
VIL MAX
0V
tLOWR
tREC
∞
<
≤
REC
t
s
1
s
120
t
s
60
SLOT
<
≤
s
15
t
s
1
LOWR
<
≤
REGULAR SPEED
tSLOT
MASTER *
SAMPLING
WINDOW
RESISTOR
MASTER
DS2432
Waveform Legend:
tSU
tRDV
tRELEASE
s
45
t
s
0
RELEASE
<
≤
*
s
15
tRDV
=
s
1
tSU
<
∞
<
≤ REC
t
s
1
s
16
t
s
6
SLOT
<
≤
s
t
s
1
LOWR
2
<
≤
OVERDRIVE SPEED
s
4
t
s
0
RELEASE
<
≤
*
s
2
tRDV
=
s
1
tSU
<
*The optimal sampling point for the master is as close as possible to the end time of the tRDV period
without exceeding tRDV. For the case of a Read-one time slot, this maximizes the amount of time for the
pull-up resistor to recover the line to a high level. For a Read-zero time slot it ensures that a read will
occur before the fastest 1-Wire device releases the line (tRELEASE = 0).
CRC GENERATION
With the DS2432 there are two different types of CRCs (Cyclic Redundancy Checks). One CRC is an
8-bit type. It is computed at the factory and lasered into the most significant byte of the 64-bit ROM. The
equivalent polynomial function of this CRC is X
8
+ X
5
+ X
4
+ 1. To determine whether the ROM data has
been read without error the bus master can compute the CRC value from the first 56 bits of the 64-bit
ROM and compare it to the value read from the DS2432. This 8-bit CRC is received in the true form
(non-inverted) when reading the ROM.
The other CRC is a 16-bit type, generated according to the standardized CRC16-polynomial function
X
16
+ X
15
+ X
2
+ 1. This CRC is used for error detection with the Read Authenticated Page command,
when reading the scratchpad and for fast verification of a data transfer when writing to the scratchpad. It
is the same type of CRC as is used for error detection within the iButton Extended File Structure. In
contrast to the 8-bit CRC, the 16-bit CRC is always returned or sent in the complemented (inverted) form.
A CRC-generator inside the DS2432 chip (Figure 12) will calculate a new 16-bit CRC as shown in the
command flow chart of Figure 7. The bus master may compare the CRC value read from the device to the
one it calculates from the data and decide whether to continue with an operation or to re-read the portion
of the data with the CRC error.
With the Write Scratchpad command the CRC is generated by first clearing the CRC generator and then
shifting in the command code, the Target Addresses TA1 (with T2 to T0 set to 0) and TA2, and all data
bytes as sent by the master. The DS2432 will transmit this CRC only if the scratchpad is filled to its
capacity.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| DS2434 | SPECIALTY MEMORY CIRCUIT, PBCY3 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2432P R | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1Kb Protected 1-Wire EEPROM with SHA-1 Engine |
| DS2432P T | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1Kb Protected 1-Wire EEPROM with SHA-1 Engine |
| DS2432P/T&R | 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 |
| DS2432P+ | 制造商:Maxim Integrated Products 功能描述:EEPROM SERL-1WIRE 1KBIT 4PAGES X 256 3.3V/5V 6PIN TSOC - Rail/Tube 制造商:Maxim Integrated Products 功能描述:1-WIRE 1KB EE W/SHA-1 TSOC PBFREE 制造商:Maxim Integrated Products 功能描述:EEPROM 1KB 1-WIRE 6TSOC 制造商:Maxim Integrated Products 功能描述:EEPROM, 1KB, 1-WIRE, 6TSOC 制造商:Maxim Integrated Products 功能描述:OPTOCOUPLERS; Memory Size:1Kbit; Memory Configuration:256 x 4; Supply Voltage Min:2.8V; Supply Voltage Max:5.25V; Memory Case Style:TSOC; No. of Pins:6; IC Interface Type:Serial; Operating Temperature Min:-40C ;RoHS Compliant: Yes |
| DS2432P+R | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1Kb Protected 1-Wire EEPROM with SHA-1 Engine |
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