参数资料
型号: MCP9802A5T-M/OT
厂商: Microchip Technology
文件页数: 13/42页
文件大小: 0K
描述: IC TEMP SNSR 12BIT 2WIRE SOT23-5
标准包装: 1
功能: 温度监控系统(传感器)
传感器类型: 内部
感应温度: -55°C ~ 125°C
精确度: ±2°C(最小值)
拓扑: ADC(三角积分型),寄存器库
输出类型: I²C?/SMBus?
输出警报:
输出风扇:
电源电压: 2.7 V ~ 5.5 V
工作温度: -55°C ~ 125°C
安装类型: 表面贴装
封装/外壳: SC-74A,SOT-753
供应商设备封装: SOT-23-5
包装: 标准包装
产品目录页面: 683 (CN2011-ZH PDF)
其它名称: MCP9802A5T-M/OTDKR
MCP9800/1/2/3
5.0
FUNCTIONAL DESCRIPTION
5.1
Temperature Sensor
The MCP9800/1/2/3 temperature sensor consists of a
band-gap type temperature sensor, a ?? Analog-to-
Digital Converter (ADC), user-programmable registers
and a 2-wire I 2 C protocol-compatible serial interface.
Resolution
The MCP9800/1/2/3 uses the difference in the base-
emitter voltage of a transistor while its collector current
is changed from IC 1 to IC 2 . With this method, the ? V BE
depends only on the ratio of the two currents and the
ambient temperature, as shown in Equation 5-1 .
EQUATION 5-1:
? V BE = ? ? ? ? ? ln ? IC 1 ? IC 2 ?
------
One-Shot
Shutdown
Fault Queue
Alert Polarity
Alert Comp/Int
0.5°C
0.25°C
0.125°C
0.0625°C
Where:
kT
q
T = temperature in kelvin
? V BE = change in diode base-emitter
voltage
Register
Pointer
Configuration
Register
Temperature
Register
T HYST
Register
T SET
Register
I 2 C?
Interface
?? ADC
Band-Gap
Temperature
Sensor
k = Boltzmann's constant
q = electron charge
IC 1 and IC 2 = currents with n:1 ratio
5.2 ?? Analog-to-Digital Converter
A Sigma-Delta ADC is used to convert ? V BE to a digital
word that corresponds to the transistor temperature.
The converter has an adjustable resolution from 0.5°C
(at 30 ms conversion time) to 0.0625°C (at 240 ms
conversion time). Thus, it allows the user to make
trade-offs between resolution and conversion time.
FIGURE 5-1:
Functional Block Diagram.
Resolution” for details.
? 2010 Microchip Technology Inc.
DS21909D-page 13
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