參數(shù)資料
型號(hào)： AMC6821
英文描述： Analog Monitor and Control Circuit
中文描述： 模擬監(jiān)視和控制電路
文件頁(yè)數(shù)： 9/47頁(yè)
文件大?。?/td> 547K
代理商： AMC6821
www.ti.com
P
APPLICATION INFORMATION
ADC CONVERTER
The AMC6821 has an 11-bit, on-chip analog-to-digital converter (ADC), as shown in
Figure 2
. This ADC
converts the analog input into digital format. The analog input is passed through front-end signal conditioning
circuitry to remove the noise. The resulting signal is then converted by the ADC. To further reduce the effects of
noise, digital filtering is performed by averaging the results of 32 measurement cycles. After digital filtering, the
newest result is stored in the temperature data register (low byte and high byte) in two’s complement format.
The ADC stops when the START bit of
Configuration Register 1
is cleared ('0') and runs when START = 1.
ADC
M
Digital
Filter
LPF and
Signal Conditioning
Data
Registers
60kHz
TEMPERATURE SENSOR
The AMC6821 has an integrated temperature sensor (shown in
Figure 3
) to measure the ambient temperature,
and one remote diode sensor (such as a Pentium thermal diode) input to measure external (CPU) temperature.
The measurement relies on the characteristics of a semiconductor junction operation at a fixed current level. The
forward voltage of the diode (V
BE
) depends on the current through it and the ambient temperature. The change
in V
BE
when the diode is operated at two different currents, I
1
and I
2
, is shown in
Equation 1
:
V
BE
KT
q
In(N)
(1)
ADC and
Signal
Processing
M
Local
Temperature
Registers
LPF and
Signal Conditioning
SW1
SW2
I
1
I
2
Diode
Temperature
Sensor
AMC6821
SBAS386A–MAY 2006–REVISED MAY 2006
Figure 2. On-Chip Analog-to-Digital Converter
Where:
k
is Boltzmann’s constant,
q
is the charge of the carrier,
T
is the absolute temperature in degrees Kelvin, and
N
is the ratio of the two currents.
Figure 3. Integrated Local Temperature Sensor
9
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AMC6821EVM 功能描述:溫度傳感器開(kāi)發(fā)工具 ANA MONITOR RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:Temperature Sensors and Control ICs 工具用于評(píng)估:MSP430G2553 接口類型:USB 工作電源電壓: 工作電源電流:
AMC6821EVM-PDK 功能描述:溫度傳感器開(kāi)發(fā)工具 THERMAL MGMT RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:Temperature Sensors and Control ICs 工具用于評(píng)估:MSP430G2553 接口類型:USB 工作電源電壓: 工作電源電流:
AMC6821-Q1 制造商:TI 制造商全稱:Texas Instruments 功能描述:INTELLIGENT TEMPERATURE MONITOR AND PWM FAN CONTROLLER
AMC6821SDBQ 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Temp Monitoring and Fan Ctrl RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
AMC6821SDBQG4 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Temp Monitoring and Fan Ctrl RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
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