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参数资料
| 型号： | EMC2103-1-KP-TR |
| 厂商： | STANDARD MICROSYSTEMS CORP |
| 元件分类： | 模拟信号调理 |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, QCC12 |
| 封装： | 4 X 4 MM, ROHS COMPLIANT, QFN-12 |
| 文件页数： | 30/89页 |
| 文件大小： | 1243K |
| 代理商： | EMC2103-1-KP-TR |
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RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
Revision 0.90 (08-19-08)
36
SMSC EMC2103
DATASHEET
5.11.3
Beta Compensation
The forward current gain, or beta, of a transistor is not constant as emitter currents change. As well,
it is not constant over changes in temperature. The variation in beta causes an error in temperature
reading that is proportional to absolute temperature. This correction is done by implementing the BJT
or transistor model for temperature measurement.
For discrete transistors configured with the collector and base shorted together, the beta is generally
sufficiently high such that the percent change in beta variation is very small. For example, a 10%
variation in beta for two forced emitter currents with a transistor whose ideal beta is 50 would contribute
approximately 0.25°C error at 100°C. However for substrate transistors where the base-emitter junction
is used for temperature measurement and the collector is tied to the substrate, the proportional beta
variation will cause large error. For example, a 10% variation in beta for two forced emitter currents
with a transistor whose ideal beta is 0.5 would contribute approximately 8.25°C error at 100°C.
The Beta Compensation circuitry in the EMC2103 corrects for this beta variation to eliminate any error
which would normally be induced. It automatically detects the appropriate beta setting to use.
5.11.4
Digital Averaging
The external diode channels support a 4x digital averaging filter. Every cycle, this filter updates the
temperature data based an a running average of the last 4 measured temperature values. The digital
averaging reduces temperature flickering and increases temperature measurement stability.
The digital averaging can be disabled by setting the DIS_AVG bit in the Configuration 2 Register (see
5.12
Diode Connections
The External Diode 1 channel can support a diode-connected transistor (such as a 2N3904) or a
substrate transistor requiring the BJT or transistor model (such as those found in a CPU or GPU) as
shown in Figure 5.7.
The External Diode 2 channel supports any diode connection shown or it can be configured to operate
in anti-parallel diode (APD) mode. When configured in APD mode, a third temperature channel is
available that shares the DP2 and DN2 pins. When in this mode, both the external diode 2 channel
and external diode 3 channel thermal diodes must be connected as diodes.
Figure 5.7 Diode Connections
Local Ground
to
DP
Typical remote
substrate transistor
i.e. CPU substrate PNP
Typical remote
discrete PNP transistor
i.e. 2N3906
Typical remote
discrete NPN transistor
i.e. 2N3904
to
DN
to
DP
to
DN
to
DP
to
DN
相关PDF资料 |
PDF描述 |
|---|---|
| EMC2103-2-AP-TR | |
| EMCL12C2J-35.000MTR | CRYSTAL OSCILLATOR, CLOCK, 35 MHz, LVPECL OUTPUT |
| EMCL12C2J-40.000M | CRYSTAL OSCILLATOR, CLOCK, 40 MHz, LVPECL OUTPUT |
| EMCL12D2H-30.000MTR | CRYSTAL OSCILLATOR, CLOCK, 30 MHz, LVPECL OUTPUT |
| EMCL12D2H-40.000MTR | CRYSTAL OSCILLATOR, CLOCK, 40 MHz, LVPECL OUTPUT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EMC2103-2 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Analog and Interface Product Selector Guide |
| EMC2103-2-AP | 制造商:SMSC 制造商全称:SMSC 功能描述:RPM-Based Fan Controller with HW Thermal Shutdown |
| EMC2103-2-AP-TR | 功能描述:板上安装温度传感器 Closed Loop RPM RPM Fan Ctrl 3Remote 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 |
| EMC2103-3-KP | 制造商:SMSC 制造商全称:SMSC 功能描述:RPM-Based Fan Controller with HW Thermal Shutdown |
| EMC2103-4 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Analog and Interface Product Selector Guide |
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