- 您现在的位置：买卖IC网 > PDF目录97865 > DS1821S+ (MAXIM INTEGRATED PRODUCTS INC) DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 1Cel, RECTANGULAR, SURFACE MOUNT PDF资料下载
参数资料
| 型号： | DS1821S+ |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | Switch/Digital Output Temperature Sensor |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 1Cel, RECTANGULAR, SURFACE MOUNT |
| 封装： | 0.208 INCH, LEAD FREE, SOIC-8 |
| 文件页数： | 4/20页 |
| 文件大小： | 543K |
| 代理商： | DS1821S+ |
DS1821
12 of 18
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
μs in duration with a minimum of a 1 μs 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
μs. 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
μs).
The DS1821 samples the 1-Wire bus during a window that lasts from 15
μs to 60 μs 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
μs in duration with a minimum of a 1 μs 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
μs 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
μs 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
μs from the start of the slot.
LINE TYPE LEGEND
Bus master pulling low
DS1821 pulling low
Resistor pull-up
VDD
GND
1-WIRE BUS
480
μs minimum
480
μs minimum
DS1821 TX
presence pulse
60-240
μs
MASTER TX RESET PULSE
MASTER RX
DS1821
waits 15-60
μs
相关PDF资料 |
PDF描述 |
|---|---|
| DS1821S | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 1Cel, RECTANGULAR, SURFACE MOUNT |
| DS1821 | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 1Cel, ROUND, SURFACE MOUNT |
| DS1821T | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), RECTANGULAR, THROUGH HOLE MOUNT |
| DS1822-PAR+T&R | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 2Cel, RECTANGULAR, THROUGH HOLE MOUNT |
| DS1822-PAR/T&R | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 2Cel, RECTANGULAR, THROUGH HOLE MOUNT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| DS1821S/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 |
| DS1821S/TR | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Programmable Digital Thermostat and Thermometer |
| DS1821S+ | 功能描述:板上安装温度传感器 Programmable Digital Thermostat/Thrmmtr 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+R | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Programmable Digital Thermostat and Thermometer |
发布紧急采购，3分钟左右您将得到回复。