参数资料
| 型号： | ADT7462ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 19/82页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADT7462 |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 1 |
| 类型： | 温度传感器 |
| 适用于相关产品： | ADT7462 |
| 所含物品： | 评估板 |
| 其它名称： | EVAL-ADT7462EBZ EVAL-ADT7462EBZ-ND |
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页第16页第17页第18页当前第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页第82页
ADT7462
SMBus Timeout
The ADT7462 includes an SMBus timeout feature. If
there is no SMBus activity for 25 ms, the ADT7462 assumes
that the bus is locked and releases the bus. This prevents the
device from locking or holding the SMBus while the device
is expecting data. Some SMBus controllers cannot handle
the SMBus timeout feature, so it can be disabled.
Configuration Register 3 (0x03)
Bit 1 SCL_Timeout = 1; SCL Timeout Enabled
Bit 1 SCL_Timeout = 0; SCL Timeout Disabled (Default)
Bit 2 SDA_Timeout = 1; SDA Timeout Enabled
Bit 2 SDA_Timeout = 0; SDA Timeout Disabled (Default)
Temperature and Voltage Measurement
Temperature Measurement
The ADT7462 can measure its own ambient temperature
and the temperature of up to three remote thermal diodes.
These diodes can be discrete diode-connected 2N3904/
2N3906s or they can be located on a processor die. Figure 32
shows how to connect a remote NPN or PNP transistor.
figure shows the external sensor as a substrate transistor, but
it could equally be a discrete transistor. If a discrete
transistor is used, the collector is not grounded and should
be linked to the base. To prevent ground noise from
interfering with the measurement, the more negative
terminal of the sensor is not referenced to ground but is
biased above ground by an internal diode at the D ? input. C1
can optionally be added as a noise filter (recommended
maximum value 1000 pF). However, a better option in noisy
environments is to add a filter, as described in the Noise
Filtering section.
To measure D V BE , the operating current through the
sensor is switched among three related currents. As shown
in Figure 33, N1 ? I and N2 ? I are different multiples of the
Current I. The currents through the temperature diode are
switched between I and N1 ? I, giving D V BE1 , and then
between I and N2 ? I, giving D V BE2 . The temperature can
then be calculated using the two D V BE measurements. This
method can also be shown to cancel the effect of any series
resistance on the temperature measurement.
The resulting D V BE waveforms are passed through a
65 kHz low-pass filter to remove noise and then to a
ADT7462
D+
2N3904
ADT7462
D+
chopper-stabilized amplifier. This amplifies and rectifies the
waveform to produce a dc voltage proportional to D V BE .
The ADC digitizes this voltage, and a temperature
2N3906
D ?
D ?
measurement is produced. To reduce the effects of noise,
digital filtering is performed by averaging the results of 16
measurement cycles for low conversion rates.
Figure 32. How to Measure Temperature Using
Discrete Transistors
Remote Thermal Diode 1 connects to Pin 15 and Pin 16.
Remote Thermal Diode 2 connects to Pin 17 and Pin 18.
Remote Thermal Diode 3 connects to Pin 19 and Pin 20.
A simple method of measuring temperature is to exploit
the negative temperature coefficient of a diode, measuring
the base-emitter voltage (V BE ) of a transistor, operated at
constant current. Unfortunately, this technique requires
Signal conditioning and measurement of the internal
temperature sensor are performed in the same manner (see
Figure 33).
Temperature Measurement Results
The results of the local and remote temperature
measurements are stored in the local and remote temperature
value registers and are compared with limits programmed
into the local and remote high and low limit registers.
Table 12. TEMPERATURE MEASUREMENT
REGISTERS
calibration to cancel the effect of the absolute value of V BE ,
which varies from device to device.
The technique used in the ADT7462 is to measure the
change in V BE when the device is operated at three different
currents. Previous devices have used only two operating
currents; use of a third current allows automatic cancellation
of any resistances in series with the external temperature
sensor.
Figure 33 shows the input signal conditioning used to
measure the output of an external temperature sensor. This
Temperature Value
Local Temperature, LSB
Local Temperature, MSB
Remote 1 Temperature, LSB
Remote 1 Temperature, MSB
Remote 2 Temperature, LSB
Remote 2 Temperature, MSB
Remote 3 Temperature, LSB
Remote 3 Temperature, MSB
Register Address
Register 0x88, Bits [7:6]
Register 0x89
Register 0x8A, Bits [7:6]
Register 0x8B
Register 0x8C, Bits [7:6]
Register 0x8D
Register 0x8E, Bits [7:6]
Register 0x8F
http://onsemi.com
19
相关PDF资料 |
PDF描述 |
|---|---|
| ADT7467BBZEVB | BOARD EVALUATION FOR ADT7467 |
| ADT7468ZEVB | BOARD EVAL FOR ADT7468 |
| ADT7473ZEVB | BOARD EVALUATION FOR ADT7473 |
| ADT7475EBZEVB | BOARD EVALUATION FOR ADT7475 |
| ADT7476EBZEVB | BOARD EVALUATION FOR ADT7476 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADT7463 | 制造商:AD 制造商全称:Analog Devices 功能描述:dB COOL Remote Thermal Controller and Voltage Monitor |
| ADT7463ARQ | 功能描述:IC REMOTE THERMAL CTRLR 24-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 |
| ADT7463ARQ-REEL | 功能描述:IC SENSOR TEMP FAN-CTRL 24QSOP 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 |
| ADT7463ARQ-REEL7 | 功能描述:IC SENSOR TEMP FAN-CTRL 24QSOP 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 |
| ADT7463ARQZ | 功能描述:马达/运动/点火控制器和驱动器 SYS MGMT CNTRLR IC 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 |
发布紧急采购，3分钟左右您将得到回复。