- 您现在的位置：买卖IC网 > PDF目录22034 > ADT7467ARQ (ON Semiconductor)IC PWM FAN CTRLR W/MONITR 16QSOP PDF资料下载
参数资料
| 型号： | ADT7467ARQ |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/72页 |
| 文件大小： | 0K |
| 描述： | IC PWM FAN CTRLR W/MONITR 16QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi Product Obsolescence 11/Feb/2009 |
| 标准包装： | 98 |
| 系列： | dBCool® |
| 功能： | 风扇控制，温度监控器 |
| 传感器类型： | 内部和外部 |
| 感应温度： | -40°C ~ 120°C，外部传感器 |
| 精确度： | ±1.5°C |
| 拓扑： | ADC，比较器，风扇速度计数器，多路复用器，寄存器库 |
| 输出类型： | SMBus? |
| 输出警报： | 无 |
| 输出风扇： | 是 |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 120°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 管件 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页当前第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页
ADT7467
device is now known and can be interrogated in
the usual way.
4. If more than one device’s SMBALERT output is
low, the one with the lowest device address has
priority in accordance with normal SMBus
arbitration.
5. Once the ADT7467 has responded to the alert
response address, the master must read the status
registers. The SMBALERT is cleared only if the
error condition is absent.
SMBus Timeout
The ADT7467 includes an SMBus timeout feature. If
there is no SMBus activity for 35 ms, the ADT7467 assumes
that the bus is locked and releases the bus. This prevents the
device from locking or holding the SMBus in anticipation of
receiving data. Some SMBus controllers cannot handle the
SMBus timeout feature, so it can be disabled.
Configuration Register 1 (0x40)
<6> TODIS = 0, SMBus timeout enabled (default)
<6> TODIS = 1, SMBus timeout disabled
Analog-to-Digital Converter
All analog inputs are multiplexed into the on-chip,
successive approximation, analog-to-digital converter,
which has a resolution of 10 bits. The basic input range is
0 V to 2.25 V, but the input has built-in attenuators to allow
measurement of V CCP without any external components. To
allow for the tolerance of the supply voltage, the ADC
produces an output of 3/4 full scale (decimal 768 or 300
hexadecimal) for the nominal input voltage and, therefore,
has adequate headroom to deal with overvoltages.
Voltage Measurement Input
The ADT7467 has one external voltage measurement
channel. It can also measure its own supply voltage, V CC .
Pin 14 can measure V CCP . The V CC supply voltage
measurement is carried out through the V CC pin (Pin 3).
Setting Bit 7 of Configuration Register 1 (0x40) allows a
5 V supply to power the ADT7467 and be measured without
overranging the V CC measurement channel. The V CCP input
can be used to monitor a chipset supply voltage in computer
systems.
Input Circuitry
The internal structure for the V CCP analog input is shown
in Figure 21. The input circuit consists of an input protection
diode, an attenuator, and a capacitor to form a first-order
low-pass filter that gives the input immunity to high
frequency noise.
Voltage Measurement Registers
Register 0x21 V CCP reading = 0x00 default
Register 0x22 V CC reading = 0x00 default
V CCP Limit Registers
Associated with the V CCP and V CC measurement
channels is a high and low limit register. Exceeding the
programmed high or low limit causes the appropriate status
bit to be se t. Exceeding either limit can also generate
SMBALERT interrupts.
Register 0x46 V CCP low limit = 0x00 default
Register 0x47 V CCP high limit = 0xFF default
Register 0x48 V CC low limit = 0x00 default
Register 0x49 V CC high limit = 0xFF default
Table 6 shows the input ranges of the analog inputs and
output codes of the 10-bit ADC.
When the ADC is running, it samples and converts a
voltage input in 0.7 ms and averages 16 conversions to
reduce noise; a measurement takes nominally 11 ms.
Additional ADC Functions for Voltage Measurements
A number of other functions are available on the
ADT7467 to offer the system designer increased flexibility.
Turn-off Averaging
For each voltage measurement read from a value register,
16 readings are made internally, the results of which are
averaged and then placed into the value register. For
instances where faster conversions are needed, setting Bit 4
of Configuration Register 2 (0x73) turns averaging off. This
produces a reading that is 16 times faster (0.7 ms), but the
reading may be noisier.
Bypass Voltage Input Attenuator
Setting Bit 5 of Configuration Register 2 (0x73) removes
the attenuation circuitry from the V CCP input. This allows
the user to directly connect external sensors or to rescale the
analog voltage measurement inputs for other applications.
The input range of the ADC without the attenuators is 0 V
to 2.25 V.
Single-channel ADC Conversion
Setting Bit 6 of Configuration Register 2 (0x73) places the
ADT7467 into single ? channel ADC conversion mode. In
this mode, the ADT7467 can be made to read a single
voltage channel only. If the internal ADT7467 clock is used,
the selected input is read every 0.7 ms. The appropriate ADC
channel is selected by writing to Bits <7:5> of the TACH1
minimum high byte register (0x55).
V CCP
17.5 k W
52.5 k W
35 pF
Figure 21. Structure of Analog Inputs
http://onsemi.com
12
相关PDF资料 |
PDF描述 |
|---|---|
| ADM1026JST-REEL7 | IC CNTRL SYS REF/EEPROM 48LQFP |
| EP1K30TC144-3N | IC ACEX 1K FPGA 30K 144-TQFP |
| 7-1624113-2 | INDUCTOR 2.7UH 5% 0805 |
| EP1K30TC144-3 | IC ACEX 1K FPGA 30K 144-TQFP |
| ADT7463ARQZ-REEL7 | IC REMOTE THERMAL CTRLR 24-QSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADT7467ARQ-REEL | 功能描述:IC REMOTE THERMAL CTRLR 16-QSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 热管理 系列:dBCool® 标准包装:1 系列:- 功能:温度监控系统（传感器） 传感器类型:内部和外部 感应温度:-40°C ~ 125°C，外部传感器 精确度:±2.5°C 本地（最大值），±5°C 远程（最大值） 拓扑:ADC，比较器，寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6 |
| ADT7467ARQ-REEL7 | 功能描述:IC REMOTE THERMAL CTRLR 16-QSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 热管理 系列:dBCool® 标准包装:1 系列:- 功能:温度监控系统（传感器） 传感器类型:内部和外部 感应温度:-40°C ~ 125°C，外部传感器 精确度:±2.5°C 本地（最大值），±5°C 远程（最大值） 拓扑:ADC，比较器，寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6 |
| ADT7467ARQZ | 功能描述:马达/运动/点火控制器和驱动器 FAN CNTRLR/INT MON RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| ADT7467ARQZ | 制造商:Analog Devices 功能描述:Temperature Sensor IC |
| ADT7467ARQZ-R7 | 功能描述:板上安装温度传感器 RMT THRM MON FAN CTL 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 |
发布紧急采购，3分钟左右您将得到回复。