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参数资料
| 型号： | DS2703UT |
| 英文描述： | SHA-1 Battery Pack Authentication IC |
| 中文描述： | SHA - 1的电池组认证IC |
| 文件页数： | 11/20页 |
| 文件大小： | 238K |
| 代理商： | DS2703UT |
DS2703 SHA-1 Battery Pack Authentication IC
11 of 20
HARDWARE CONFIGURATION
The DS2703 uses an open-drain output driver as part of the bidirectional interface circuitry shown in Figure 5. If a
bidirectional pin is not available on the bus master, separate output and input pins can be connected together. For
normal communication the 1-Wire bus must have a pullup resistor at the bus-master end of the bus. For short line
lengths and/or V
PULLUP
≥
3.0V, a value of approximately 4.7k is recommended. For long line lengths and/or
V
PULLUP
< 3.0V, a value of approximately 2k is recommended. The idle state for the 1-Wire bus is high. If, for any
reason, a bus transaction must be suspended, the bus must be left in the idle state to properly resume the
transaction later. Note that if the bus is left low for more than t
LOW0
, slave devices on the bus begin to interpret the
low period as a reset pulse, effectively terminating the transaction.
When performing SHA-1 computations, the DS2703 requires a stronger pullup than 4.7k. A P-FET in parallel with
the standard pullup can be switched on during computation and then disabled to read the result. When measuring
the thermistor R
THM
, both the strong pullup and standard pullup should be disabled to allow a weak pullup to form a
voltage divider with the thermistor. A voltage A/D connected directly to the 1-Wire bus can then read the voltage
drop of the thermistor.
Figure 5. 1-Wire Bus Interface Circuitry
V
PULLUP
TRANSACTION SEQUENCE
The protocol for accessing the DS2703 through the 1-Wire port is as follows:
Initialization
Net Address Command
Function Command(s)
Data Transfer (not all commands have data transfer)
All transactions of the 1-Wire bus begin with an initialization sequence consisting of a reset pulse transmitted by the
bus master, followed by a presence pulse simultaneously transmitted by the DS2703 and any other slaves on the
bus. The presence pulse tells the bus master that one or more devices are on the bus and ready to operate. For
more details, see the
1-Wire Signaling
section below.
Bus Master
DS2703
Rx
Tx
4.7K
50K
150
R
THM
~100
MOSFET
~1
μ
A
Rx
Tx
Activate
THM
PACK-
DQ
COMP
COMM
Voltage A/D
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2704 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1280-Bit EEPROM with SHA-1 Authentication |
| DS2704-500-WAFER | 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 |
| DS2704E+ | 制造商:Maxim Integrated Products 功能描述:1024 BIT MEM W/SHA-1 AUTH L/F - Rail/Tube |
| DS2704G+ | 功能描述:电可擦除可编程只读存储器 1280-Bit 电可擦除可编程只读存储器 w/SHA-1 Authent 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 |
| DS2704G+T&R | 制造商:Maxim Integrated Products 功能描述:EEPROM SERL-1WIRE 1.25KBIT 5PAGES X 32 3.3V/5V 6TDFN EP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC EEPROM 1.25KBIT 6TDFN 制造商:Maxim Integrated Products 功能描述:EEPROM 1280-Bit EEPROM w/SHA-1 Authent |
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