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参数资料
| 型号： | DS1821C+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 12/19页 |
| 文件大小： | 793K |
| 描述： | IC THERMOMETER/STAT PROG 3-TO92 |
| 标准包装： | 500 |
| 系列： | 1-Wire® |
| 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： | ±1°C |
| 拓扑： | 比较器，寄存器库 |
| 输出类型： | 数字 |
| 输出警报： | 无 |
| 输出风扇： | 无 |
| 电源电压： | 2.7 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 |
DS1821
12 of 19
INITIALIZATION TIMING Figure 7
READ/WRITE TIME SLOTS
The bus master writes data to the DS1821 during write time slots and reads data from the DS1821 during
read time slots. One bit of data is transmitted over the 1-Wire bus per time slot.
WRITE TIME SLOTS
There are two types of write time slots: Write 1 time slots and Write 0 time slots. The bus master
uses a Write 1 time slot to write a logic 1 to the DS1821 and a Write 0 time slot to write a logic 0 to the
DS1821. All write time slots must be a minimum of 60 祍 in duration with a minimum of a 1 祍 recovery
time between individual write slots. Both types of write time slots are initiated by the master pulling the
1-Wire bus low (see Figure 8).
To generate a Write 1 time slot, after pulling the 1-Wire bus low, the bus master must release the 1-Wire
bus within 15 祍. When the bus is released, the 5k pullup resistor will pull the bus high. To generate a
Write 0 time slot, after pulling the 1-Wire bus low, the bus master must continue to hold the bus low for
the duration of the time slot (at least 60 祍).
The DS1821 samples the 1-Wire bus during a window that lasts from 15 祍 to 60 祍 after the master
initiates the write time slot. If the bus is high during the sampling window, a 1 is written to the DS1821.
If the line is low, a 0 is written to the DS1821.
READ TIME SLOTS
The DS1821 can only transmit data to the master when the master issues read time slots. Therefore, the
master must generate read time slots immediately after issuing a read command (e.g., Read Temperature
[AAh]), so that the DS1821 can provide the requested data. All read time slots must be a minimum of 60
祍 in duration with a minimum of a 1 祍 recovery time between slots. A read time slot is initiated by the
master device pulling the 1-Wire bus low for a minimum of 1 祍 and then releasing the bus (see Figure
8). After the master initiates the read time slot, the DS1821 will begin transmitting a 1 or 0 on the bus.
The DS1821 transmits a 1 by leaving the bus high and transmits a 0 by pulling the bus low. When
transmitting a 0, the DS1821 will release the bus by the end of the time slot, and the bus will be pulled
back to its high idle state by the pullup resister. Output data from the DS1821 is valid for 15 祍 after the
falling edge that initiated the read time slot. Therefore, the master must release the bus and then sample
the bus state within 15 祍 from the start of the slot.
LINE TYPE LEGEND
Bus master pulling low
DS1821 pulling low
-
V
DD
GND
1-WIRE BUS
480 ?/SPAN>s minimum
480 ?/SPAN>s minimum
DS1821 T
X
presence pulse
60-240 s
MASTER T
X
RESET PULSE
MASTER R
X
S1821
aits 15-60 ?/SPAN>s
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1821C+ | 功能描述:恒温器 Programmable Digital Thermo-stat/monitor RoHS:否 制造商:Maxim Integrated 功能: 开路温度: 闭合温度: 准确性:+/- 1 C 温度范围:- 55 C to + 125 C 电流额定值:500 uA 电压额定值:2.7 V to 5.5 V 产品:Thermostats |
| DS1821-C02 | 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 |
| DS1821-C04 | 制造商:DSC 功能描述: |
| DS1821S | 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 |
| DS1821S/T&R | 制造商:Maxim Integrated Products 功能描述:PROGRAM THERMOSTAT 208ML 8-SOIC T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERMOMETER/STAT PROG 8-SOIC |
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