- 您现在的位置：买卖IC网 > PDF目录22031 > ADT7468ARQ-REEL7 (ON Semiconductor)IC REMOTE THERMAL CTRLR 24-QSOP PDF资料下载
参数资料
| 型号： | ADT7468ARQ-REEL7 |
| 厂商： | ON Semiconductor |
| 文件页数： | 16/81页 |
| 文件大小： | 0K |
| 描述： | IC REMOTE THERMAL CTRLR 24-QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi Product Obsolescence 11/Feb/2009 |
| 标准包装： | 1,000 |
| 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： | ±2°C（最小值） |
| 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： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-QSOP |
| 包装： | 带卷 (TR) |
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页第12页第13页第14页第15页当前第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页第73页第74页第75页第76页第77页第78页第79页第80页第81页
ADT7468
ANALOG-TO-DIGITAL CONVERTER
All analog inputs are multiplexed into the on-chip, successive
approximation, analog-to-digital converter, which has a resolu-
tion of 10 bits. The basic input range is 0 V to 2.25 V, but the
inputs have built-in attenuators to allow measurement of 2.5 V,
3.3 V, 5 V, 12 V, and the processor core voltage V CCP without any
external components. To allow for the tolerance of these supply
voltages, the ADC produces an output of 3/4 full scale (decimal
768 or 300 hex) for the nominal input voltage and therefore has
adequate headroom to cope with overvoltages.
VOLTAGE MEASUREMENT INPUT
The ADT7468 has four external voltage measurement channels
and can measure its own supply voltage, V CC . Pins 20 to 23 can
measure 5 V, 12 V, 2.5 V supplies, and the processor core voltage
V CCP (0 V to 3 V input). The V CC supply voltage measurement is
carried out through the V CC pin (Pin 4). Setting Bit 7 of Config-
uration Register 1 (Reg. 0x40) allows a 5 V supply to power the
ADT7468 and be measured without overranging the V CC
measurement channel. The 2.5 V input can be used to monitor a
chipset supply voltage in computer systems.
Input Circuitry
The internal structure for the analog inputs is shown in
Figure 22. The input circuit consists of an input protection
diode, an attenuator, and a capacitor to form a first-order low-
pass filter that gives input immunity to high frequency noise.
120k ?
12V IN
20k ? 30pF
Reg. 0x24, 12 V reading = 0x00 default
Voltage Limit Registers
Associated with each voltage measurement channel is a high
and low limit register. Exceeding the programmed high or low
limit causes the appropriate status bit to be set. Exceeding either
limit can also generate SMBALERT interrupts.
Reg. 0x44, 2.5 V low limit = 0x00 default
Reg. 0x45, 2.5 V high limit = 0xFF default
Reg. 0x46, V CCP low limit = 0x00 default
Reg. 0x47, V CCP high limit = 0xFF default
Reg. 0x48, V CC low limit = 0x00 default
Reg. 0x49, V CC high limit = 0xFF default
Reg. 0x4A, 5 V low limit = 0x00 default
Reg. 0x4B, 5 V high limit = 0xFF default
Reg. 0x4C, 12 V Low Limit = 0x00 default
Reg. 0x4D, 12 V 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
5V IN
93k ?
47k ?
30pF
measurement takes nominally 11 ms.
ADDITIONAL ADC FUNCTIONS FOR VOLTAGE
3.3V IN
68k ?
71k ?
30pF
MUX
MEASUREMENTS
A number of other functions are available on the ADT7468 to
offer the system designer increased flexibility.
2.5V IN
45k ?
Turn-Off Averaging
94k ?
30pF
For each voltage measurement read from a value register,
V CCP
17.5k ?
16 readings have actually been made internally and the results
averaged before being placed into the value register. For
52.5k ?
35pF
instance, where faster conversions are needed, setting Bit 4 of
Configuration Register 2 (Reg. 0x73) turns averaging off. This
Figure 22. Structure of Analog Inputs
Voltage Measurement Registers
Reg. 0x20, 2.5 V reading = 0x00 default
Reg. 0x21, V CCP reading = 0x00 default
Reg. 0x22, V CC reading = 0x00 default
Reg. 0x23, 5 V reading = 0x00 default
effectively gives a reading 16 times faster (0.7 ms), but the
reading may be noisier.
Bypass Voltage Input Attenuator
Setting Bit 5 of Configuration Register 2 (Reg. 0x73) removes
the attenuation circuitry from the 2.5 V, V CCP , V CC , 5 V, and 12 V
inputs, which allows the user to directly connect external
sensors or 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.
Rev. 3 | Page 16 of 81 | www.onsemi.com
相关PDF资料 |
PDF描述 |
|---|---|
| EPF6016ATC100-3N | IC FLEX 6000 FPGA 16K 100-TQFP |
| ADT7468ARQ-REEL | IC REMOTE THERMAL CTRLR 24-QSOP |
| EPF6016ATC100-3 | IC FLEX 6000 FPGA 16K 100-TQFP |
| ADT7468ARQ | IC REMOTE THERMAL CTRLR 24-QSOP |
| VE-J3H-CW | CONVERTER MOD DC/DC 52V 100W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADT7468ARQZ | 功能描述:板上安装温度传感器 RMT THRM CTR VLT MON 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 |
| ADT7468ARQZ-REEL | 功能描述:板上安装温度传感器 RMT THRM CTR VLT MON 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 |
| ADT7468ARQZ-REEL7 | 功能描述:IC REMOTE THERMAL CTRLR 24QSOP RoHS:是 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 |
| ADT7468ARQZ-RL7 | 功能描述:板上安装温度传感器 RMT THRM CTR VLT MON 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 |
| ADT7468ZEVB | 功能描述:BOARD EVAL FOR ADT7468 RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB） 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
发布紧急采购，3分钟左右您将得到回复。