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| 型号： | TC621HEOA |
| 厂商： | Microchip Technology |
| 文件页数： | 5/14页 |
| 文件大小： | 0K |
| 描述： | IC TEMP SNSR 5V DUAL TRIP 8-SOIC |
| 标准包装： | 100 |
| 感应温度： | -40°C ~ 85°C |
| 输出类型： | 低有效 |
| 电源电压： | 4.5 V ~ 18 V |
| 精确度： | ±1°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 管件 |
| 产品目录页面： | 682 (CN2011-ZH PDF) |
TC620/TC621
3.0
DETAILED DESCRIPTION
Care must also be taken to ensure the LOW SET
temperature setting is at least 5°C lower than the HIGH
The TC620 has a positive temperature coefficient tem-
perature sensor and a dual threshold detector. Temper-
ature set point programming is accomplished with
external resistors from the HIGH SET and LOW SET
inputs to V DD. The HIGH LIMIT and LOW LIMIT outputs
remain low as long as measured temperature is below
set point values. As measured temperature increases,
the LOW LIMIT output is driven high when temperature
equals the LOW SET set point (±3°C max). If tempera-
ture continues to climb, the HIGH LIMIT output is driven
high when temperature equals the HIGH SET set point
(Figure 3-1). The CONTROL (hysteresis) output is
latched in its active state at the temperature specified
by the HIGH SET resistor. CONTROL is maintained
active until temperature falls to the value specified by
SET temperature setting.
Figure 3-2 can help the user obtain an estimate of the
external resistor values required for the desired LOW
SET and HIGH SET trip points.
250
200
150
100
the LOW SET resistor.
50
-55
-35
-15
5
25
45
65
85
105
125
TEMPERATURE (°C)
High Set Point
FIGURE 3-2:
TC620 Sense Resistors vs.
Low Set Point
Temperature
Trip Temperature
Low Limit Output
High Limit Output
3.2
Built-in Hysteresis
Control Output (Cool Option
Control Output (Heat Option)
To prevent output “chattering” when measured
temperature is at (or near) the programmed trip point
values, the LOW SET and HIGH SET inputs each have
FIGURE 3-1:
Output Logic
TC620/TC621 Input vs.
built-in hysteresis of -2°C below the programmed
settings (Figure 3-3).
3.1
Programming the TC620
The resistor values to achieve the desired trip point
temperatures on HIGH SET and LOW SET are
Set Point
(Set Point 2°C)
calculated using Equation 3-1:
EQUATION 3-1:
High Limit
R TRIP = 0.5997 x T 2.1312
Where:
R TRIP = Programming resistor in Ohms
T = The desired trip point temperature in degrees
Kelvin.
For example, a 50°C setting on either the HIGH SET
or LOW SET input is calculated using Equation 3-2 as
follows:
EQUATION 3-2:
R SET = 0.5997 x ((50 + 273.15) 2.1312 ) = 133.6 k Ω
Care must be taken to ensure the LOW SET program-
ming resistor is a smaller value than the HIGH SET
programming resistor. Failure to do this will result in
erroneous operation of the CONTROL output.
? 2006 Microchip Technology Inc.
or Low Limit
Output
FIGURE 3-3: Built-In Hysteresis on Low
Limit and High Limit Outputs
As shown, the outputs remain in their active state
(hysteresis) until temperature falls an additional 2°C
below the user ’s setting.
DS21439C-page 5
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| TC621HEOA713 | 功能描述:板上安装温度传感器 Ext Sensor H Opt. 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 |
| TC621HEPA | 功能描述:板上安装温度传感器 Ext Sensor H Opt. 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 |
| TC621XCOA | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:5V, Dual Trip Point Temperature Sensors |
| TC621XCPA | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:5V, Dual Trip Point Temperature Sensors |
| TC621XEOA | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:5V, Dual Trip Point Temperature Sensors |
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