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)： 10/47頁(yè)
文件大?。?/td> 547K
代理商： AMC6821
www.ti.com
P
ADC and
Signal
Processing
M
Remote
Temperature
Registers
LPF and
Signal Conditioning
SW1
SW2
I
1
I
2
Bias Diode
I
BIAS
IN+
IN
-
Substrate
Sensing
Transistor
uP
READING Temperature Data
It is important to note that temperature can be read by an 8-bit value (with 1
°
C of resolution) from the
Temp-DATA-HByte register, or as an 11-bit value (with 0.125
°
C of resolution) from the Temp-DATA-LByte and
Temp-DATA-HByte registers. If only 1
°
C of resolution is required, the temperature readings can be read back at
any time and in no particular order. If reading the 11-bit measurement is required, the process involves a
two-register read for each measurement. To get an 11-bit result of the remote sensor, the controller must read
the Temp-DATA-LByte register (0x06) first, and the Remote-Temp-DATA-HByte register (0x0B) second to
complete the reading. However, to get bit 11 of the local sensor only, or to get both local and remote sensors,
the
controller
must
read
Temp-DATA-LByte
first,
Remote-Temp-DATA-HByte third. This method causes all associated temperature data registers to be frozen
until the Remote-Temp-DATA-HByte register has been read. This process also prevents the high byte data from
being updated while the three LSBs are being read, and vice-versa.
AMC6821
SBAS386A–MAY 2006–REVISED MAY 2006
APPLICATION INFORMATION (continued)
The remote sensing transistor can be a substrate transistor built within the microprocessor (as in a Pentium-IV),
or a discrete small-signal type transistor. This architecture is shown in
Figure 4
. The internal bias diode biases
the IN– terminal above ground to prevent the ground noise from interfering with the measurement. An external
capacitor (up to 1000pF) may be placed between IN+ and IN– to further reduce the noise from interfering.
Figure 4. Remote Temperature Sensor
The analog sensing signal is pre-processed by a low-pass filter and signal conditioning circuitry, then digitized
by the ADC. The resulting digital signal is further processed by the digital filter and processing unit. The final
result is stored in the local temperature data register and remote temperature data register, respectively. The
8MSBs are stored in the corresponding Temp-DATA-HByte register, and the 3LSBs are stored in the
Temp-DATA-LByte register. Refer to the
Temperature Data Registers
section for details.
The format of the final result is in two’s complement; see
Table 4
. It should be noted that the device measures
the temperature from –40°C to +125°C, although the code represents temperatures from –128
°
C to +127
°
C.
Parasitic resistance (seen in series with the remote diode) to the IN+ and IN– inputs to the AMC6821 is caused
by a variety of factors, including printed circuit board (PCB) track resistance and track length. This series
resistance appears as a temperature offset in the remote sensor temperature measurement, and causes more
than 0.5
°
C error per ohm. The AMC6821 is implemented with a TI-patented technology to automatically cancel
out the effect of this series resistance, giving a more accurate result without the need for user-characterization of
this resistance.
Local-Temp-DATA-HByte
(0x0A)
second,
and
10
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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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