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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： | 16/20页 |
| 文件大小： | 543K |
| 代理商： | DS1821S+ |
DS1821
5 of 18
Nonvolatile write status can be monitored by reading the NVB bit in the status/configuration register:
NVB = 1 – a write to EEPROM memory is in progress, NVB = 0 – nonvolatile memory is idle.
THERMOSTAT MODE
In thermostat mode (T/R
= 1), the DS1821 can operate as a standalone thermostat that triggers according
to the TH and TL trip-points programmed while the device was in 1-Wire mode. In thermostat mode the
DS1821 powers-up performing continuous temperature conversions, and the DQ pin acts as the
thermostat output.
Detailed operation of the thermostat output is provided in the OPERATION –
STANDALONE THERMOSTAT section of this datasheet.
Communications can be re-established with the DS1821 while it is in thermostat mode by pulling VDD to
0V while the DQ line is held high, and then toggling the DQ line low 16 times as shown in Figure 12.
This temporarily places the DS1821 in 1-Wire mode, allowing microprocessor communication with the
DS1821 via the DQ pin. At this time any I/O function can be performed, such as reading/writing the TH,
TL or configuration registers or reading the temperature register. To return to thermostat mode, the same
procedure can be performed (pulling VDD to 0V while the DQ line is held high, and then clocking the DQ
line 16 times) or the power can be cycled. Note that temporarily putting the DS1821 into 1-Wire mode
does not change the power-up mode of the device; this can only be changed by rewriting the T/R
bit in
the status/configuration register.
Also note that holding both VDD and DQ low for more than
approximately 10 seconds will cause the DS1821 to be powered down.
OPERATION – MEASURING TEMPERATURE
DS1821 output temperature data is calibrated in degrees centigrade and is stored in two’s complement
format in the 1-byte (8-bit) temperature register (see Figure 3), which the user can access when the
DS1821 is in 1-Wire mode (T/R
= 0 in the status/configuration register). The sign bit (S) indicates if the
temperature is positive or negative; for positive numbers S = 0 and for negative numbers S = 1. Table 2
gives examples of digital output data and the corresponding temperature reading. For Fahrenheit
measurements, a lookup table or conversion routine must be used.
The DS1821 can be configured by the user to take continuous temperature measurements (continuous
conversion mode) or single measurements (one-shot mode). The desired configuration can be achieved
by setting the nonvolatile1SHOT bit in the status/configuration register: 1SHOT = 0 – continuous
conversion mode, 1SHOT = 1 – one-shot mode. Note that the 1SHOT setting only controls the operation
of the device in 1-Wire mode; in thermostat mode, continuous temperature conversions are started
automatically at power-up.
In continuous conversion mode, the Start Convert T [EEh] command initiates continuous temperature
conversions, which can be stopped using the Stop Convert T [22h] command. In one-shot mode the Start
Convert T [EEh] command initiates a single temperature conversion after which the DS1821 returns to a
low-power standby state.
In this mode, the microprocessor can monitor the DONE bit in the
configuration register to determine when the conversion is complete: DONE = 0 ― conversion in
progress, DONE = 1 ― conversion complete. The DONE bit does not provide conversion status in
continuous conversion mode since measurements are constantly in progress (i.e., DONE will always be
0).
TEMPERATURE, TH and TL REGISTER FORMAT Figure 3
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
S
2
6
2
5
2
4
2
3
2
1
2
0
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PDF描述 |
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| DS1821S | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 1Cel, RECTANGULAR, SURFACE MOUNT |
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| DS1822-PAR+T&R | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 2Cel, RECTANGULAR, THROUGH HOLE MOUNT |
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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 |
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