- 您现在的位置：买卖IC网 > Datasheet目录221 > DS1920-F5+ (Maxim Integrated)IBUTTON TEMPERATURE F5 Datasheet资料下载
参数资料
| 型号： | DS1920-F5+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 4/22页 |
| 文件大小： | 0K |
| 描述： | IBUTTON TEMPERATURE F5 |
| 产品培训模块： | Obsolescence Mitigation Program |
| RoHS指令信息： | IButton RoHS Compliance Plan |
| 标准包装： | 25 |
| 系列： | iButton® |
| 存储容量： | 2B |
| 存储器类型： | EEPROM |
DS1920
STRONG PULLUP FOR SUPPLYING DS1920 DURING TEMPERATURE
CONVERSION Figure 2
OPERATION—MEASURING TEMPERATURE
The DS1920 measures temperatures through the use of an on-board proprietary temperature measurement
technique. A block diagram of the temperature measurement circuitry is shown in Figure 3.
The DS1920 measures temperature by counting the number of clock cycles that an oscillator with a low
temperature coefficient goes through during a gate period determined by a high temperature coefficient
oscillator. The counter is preset with a base count that corresponds to -55°C. If the counter reaches 0
before the gate period is over, the temperature register, which is also preset to the -55°C value, is
incremented, indicating that the temperature is higher than -55°C.
At the same time, the counter is then preset with a value determined by the slope accumulator circuitry.
The counter is then clocked again until it reaches 0. If the gate period is still not finished, then this
process repeats.
The slope accumulator compensates for the nonlinear behavior of the oscillators over temperature,
yielding a high-resolution temperature measurement. This is done by changing the number of counts
necessary for the counter to go through for each incremental degree in temperature. To obtain the desired
resolution, therefore, both the value of the counter and the number of counts per degree C (the value of
the slope accumulator) at a given temperature must be known.
Internally, this calculation is done inside the DS1920 to provide 0.5°C resolution. The temperature
reading is provided in a 16-bit, sign-extended two’s complement reading. Table 1 describes the exact
relationship of output data to measured temperature. The data is transmitted serially over the 1-Wire
interface. The DS1920 can measure temperature over the range of -55°C to +100°C in 0.5°C increments.
For Fahrenheit usage, a lookup table or conversion factor must be used.
Note that temperature is represented in the DS1920 in terms of a 1/2°C LSB, yielding the following 9-bit
format:
MSB
LSB
1
1
1
0
0
1
1
1
0
= -25°C
4 of 22
相关PDF资料 |
PDF描述 |
|---|---|
| DS1921G-F5# | IBUTTON THERMOCHRON F5 |
| DS1921H-F5# | IBUTTON THERMOCHRON F5 |
| DS1921K# | KIT IBUTTON THERMOCHRON |
| DS1922E-F5# | IBUTTON TEMP LOGGER 4KBit F5 |
| DS1922L-F5# | IBUTTON TEMP LOGGER |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1920-F5+ | 功能描述:iButton Temperature iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated |
| DS1921 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:High-Resolution Thermochron iButton |
| DS1921G | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Thermochron iButton |
| DS1921G_11 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Logs Up to 2048 Consecutive Temperature Thermochron iButton |
| DS1921G_1109 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Thermochron iButton |
发布紧急采购，3分钟左右您将得到回复。