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參數(shù)資料
| 型號： | AMC6821SDBQR |
| 英文描述： | Analog Monitor and Control Circuit |
| 中文描述： | 模擬監(jiān)視和控制電路 |
| 文件頁數(shù)： | 9/47頁 |
| 文件大?。?/td> | 547K |
| 代理商： | AMC6821SDBQR |
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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 |
|---|---|
| AMC6821SDBQRG4 | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Temp Monitoring and Fan Control 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 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| AMC6821SQDBQRQ1 | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Auto Cat Temp Mon and Fan Control 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 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| AMC682J50ACK | 制造商:Nissei Electric 功能描述:CAPACITOR, METALLIZED FILM, POLYESTER, 50 V, 0.0068 uF, THROUGH HOLE MOUNT |
| AMC69G-V30 | 制造商:Panasonic Industrial Company 功能描述:KNOB |
| AMC69R-1L0 | 制造商:Panasonic Industrial Company 功能描述:HOLDER |
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