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参数资料
| 型号： | DS18B20+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 9/22页 |
| 文件大小： | 528K |
| 描述： | IC THERM MICROLAN PROG-RES TO-92 |
| 产品培训模块： | 1-Wire Communications Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 500 |
| 功能： | 温度计，恒温计 |
| 传感器类型： | 内部 |
| 感应温度： | -55°C ~ 125°C |
| 精确度： | ±2°C（最小值） |
| 拓扑： | 寄存器库，变签式暂存器 |
| 输出类型： | 1-Wire? |
| 输出警报： | 是 |
| 输出风扇： | 无 |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-226-3、TO-92-3 标准主体 |
| 供应商设备封装： | TO-92-3 |
| 包装： | 管件 |
| 产品目录页面： | 1435 (CN2011-ZH PDF) |
DS18B20
9 of 22
is available in Application Note 27: Understanding and Using Cyclic Redundancy Checks with Maxim
i
Button Products.
Figure 9. CRC Generator
1-WIRE BUS SYSTEM
The 1-Wire bus system uses a single bus master to control one or more slave devices. The DS18B20 is
always a slave. When there is only one slave on the bus, the system is referred to as a single-drop
system; the system is multidrop if there are multiple slaves on the bus.
All data and commands are transmitted least significant bit first over the 1-Wire bus.
The following discussion of the 1-Wire bus system is broken down into three topics: hardware
configuration, transaction sequence, and 1-Wire signaling (signal types and timing).
HARDWARE CONFIGURATION
The 1-Wire bus has by definition only a single data line. Each device (master or slave) interfaces to the
data line via an open-drain or 3-state port. This allows each device to release the data line when the
device is not transmitting data so the bus is available for use by another device. The 1-Wire port of the
DS18B20 (the DQ pin) is open drain with an internal circuit equivalent to that shown in Figure 10.
The 1-Wire bus requires an external pullup resistor of approximately 5k&; thus, the idle state for the
1-Wire bus is high. If for any reason a transaction needs to be suspended, the bus MUST be left in the idle
state if the transaction is to resume. Infinite recovery time can occur between bits so long as the 1-Wire
bus is in the inactive (high) state during the recovery period. If the bus is held low for more than 480祍,
all components on the bus will be reset.
Figure 10. Hardware Configuration
SB)
SB)
XOR
XOR
XOR
INP T
V
PU
.7k
5糀
TYP
x
x
-
100&
X
x
Rx = RECEIVE
Tx = TRANSMIT
-Wire BUS
Q
PIN
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS18B20/GG8 | 制造商:Maxim Integrated Products 功能描述:PROGRAMMABLE RESOLUTION 1-WIRE DIGITAL THERMOMETER - Rail/Tube |
| DS18B20/T&R | 制造商:Maxim Integrated Products 功能描述:IC THERM MICROLAN PROG-RES TO-92 |
| DS18B20/T&R | 功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| DS18B20_07 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Programmable Resolution 1-Wire Digital Thermometer |
| DS18B20_08 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1-Wire Digital Thermometer |
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