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| 型号： | ADT7463ARQZ-REEL |
| 厂商： | ON Semiconductor |
| 文件页数： | 17/50页 |
| 文件大小： | 726K |
| 描述： | IC REMOTE THERMAL CTRLR 24-QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi QSOP 24ld Pkg (MSL) Change 17/Jun/2010 |
| 标准包装： | 2,500 |
| 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（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) |
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ADT7463
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17
VID Code Change Detect Function
The ADT7463 has a VID code change detect function.
When Pin 21 is configured as the VID5 input, VID code
changes can be detected and reported back by the ADT7463.
Bit 0 of Status Register 2 (Reg. 0x42) is the 12V/VC bit and
denotes a VID change when set. The VID code change bit
gets set when the logic states on the VID inputs are different
than they were 11 ms previously. The change of VID code
can be used to generate an SMBALERT
interrupt. If an
SMBALERT
interrupt is not required, Bit 0 of Interrupt
Mask Register 2 (Reg. 0x75), when set, prevents
SMBALERT
s from occurring on VID code changes.
Table 13. STATUS REGISTER (REG. 0X42)
Bit
Description
<0>
12V/VC
0: If Pin 21 is configured as VID5, then a
Logic 0 denotes no change in VID code within
last 11 ms.
1: If Pin 21 is configured as VID5, then a
Logic 1 means that a change has occurred on
the VID code inputs within the last 11 ms. An
SMBALERT
generates if this function is
enabled.
Additional ADC Functions for Voltage
Measurement
A number of other functions are available on the
ADT7463 to offer the systems designer increased flexibility,
including:
Turnoff Averaging
For each voltage measurement read from a value register,
16 readings have actually been made internally and the
results averaged before being placed into the value register.
There may be an instance where you would like to speed up
conversions. Setting Bit 4 of Configuration Register 2
(Reg. 0x73) turns averaging off. This effectively gives a
reading 16 times faster (711 ms), but the reading may be
noisier.
Bypass Voltage Input Attenuators
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. This 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.
Singlechannel ADC Conversion
Setting Bit 6 of Configuration Register 2 (Reg. 0x73)
places the ADT7463 into singlechannel ADC conversion
mode. In this mode, the ADT7463 can be made to read a
single voltage channel only. If the internal ADT7463 clock
is used, the selected input is read every 711 ms. The
appropriate ADC channel is selected by writing to
Bits <7:5> of the TACH1 Minimum High Byte Register
(0x55).
Table 14. CONFIGURATION REGISTER 2 (REG. 0X73)
Bit
Description
<4>
1: Averaging Off
<5>
1: Bypass Input Attenuators
<6>
1: Singlechannel Convert Mode
Table 15. TACH1 MINIMUM HIGH BYTE (REG. 0X55)
Bit
Description
<7:5>
Selects ADC Channel for Singlechannel Convert
Mode
Value
Channel Selected
000
2.5 V
001
V
CCP
010
V
CC
011
5 V
100
12 V
Temperature Measurement System
Local Temperature Measurement
The ADT7463 contains an onchip band gap temperature
sensor whose output is digitized by the onchip 10bit ADC.
The 8bit MSB temperature data is stored in the local
temperature register (Address 26h). As both positive and
negative temperatures can be measured, the temperature
data is stored in twos complement format, as shown in
Table 16. Theoretically, the temperature sensor and ADC
can measure temperatures from 128癈 to +127癈 with a
resolution of 0.25癈. However, this exceeds the operating
temperature range of the device, so local temperature
measurements outside this range are not possible.
Remote Temperature Measurement
The ADT7463 can measure the temperature of two remote
diode sensors or diodeconnected transistors connected to
Pins 15 and 16, or 17 and 18.
The forward voltage of a diode or diodeconnected
transistor operated at a constant current exhibits a negative
temperature coefficient of about 2 mV/癈. Unfortunately,
the absolute value of V
BE
varies from device to device and
individual calibration is required to null this out, so the
technique is unsuitable for mass production. The technique
used in the ADT7463 is to measure the change in V
BE
when
the device is operated at two different currents.
This is given by
(eq. 1)
DV
BE
+ KTq ln(N)
where:
K is Boltzmanns constant.
q is the charge on the carrier.
T is the absolute temperature in Kelvins.
N is the ratio of the two currents.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADT7463ARQZ-REEL7 | 功能描述:IC REMOTE THERMAL CTRLR 24-QSOP 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 |
| ADT7466 | 制造商:AD 制造商全称:Analog Devices 功能描述:dBCool Remote Thermal Controller and Voltage Monitor |
| ADT7466ARQZ | 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 |
| ADT7466ARQZ-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 |
| ADT7466ARQZ-REEL7 | 功能描述:IC REMOTE THERMAL CTRLR 16QSOP 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 |
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