- 您现在的位置：买卖IC网 > PDF目录19409 > ADM1026JSTZ-REEL (ON Semiconductor)IC CTLR SYS REF/EEPROM 48-LQFP PDF资料下载
参数资料
| 型号： | ADM1026JSTZ-REEL |
| 厂商： | ON Semiconductor |
| 文件页数： | 17/55页 |
| 文件大小： | 0K |
| 描述： | IC CTLR SYS REF/EEPROM 48-LQFP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 1 |
| 功能： | 硬件监控器 |
| 传感器类型： | 内部和外部 |
| 感应温度： | 0°C ~ 100°C |
| 精确度： | ±3°C（最小值） |
| 拓扑： | ADC，比较器，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： | 0°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 标准包装 |
| 其它名称： | ADM1026JSTZ-REELOSDKR |
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页当前第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
ADM1026
A IN0 – A IN5
109.4k ?
4.6pF
R1 +
for A IN0 through A IN5 (eq. 2)
Voltage Measurement Inputs
The internal structure for all the analog inputs is shown in
Figure 26. Each input circuit consists of an input protection
diode, an attenuator, plus a capacitor to form a first-order
low-pass filter that gives each voltage measurement input
immunity to high frequency noise. The ? 12 V input also has
a resistor connected to the on-chip reference to offset the
negative voltage range so that it is always positive and can
be handled by the ADC. This allows most popular power
supply voltages to be monitored directly by the ADM1026
without requiring any additional resistor scaling.
21.9k ?
(0V – 3V)
However, when scaling A IN0 to A IN5 , it should be noted
that these inputs already have an on-chip attenuator, because
their primary function is to monitor SCSI termination
voltages. This attenuator loads any external attenuator. The
input resistance of the on-chip attenuator can be between
100 k W and 200 k W . For this tolerance not to affect the
accuracy, the output resistance of the external attenuator
should be very much lower than this, that is, 1 k W in order
to add not more than 1% to the total unadjusted error (TUE).
Alternatively, the input can be buffered using an op amp.
V f s * 3.0
R2 3.0
R1 +
for A IN6 through A IN9 (eq. 3)
A IN6 – A IN9
(0V – 2.5V)
52.5k ?
4.6pF
V f s * 2.5
R2 2.5
Negative and bipolar input ranges can be accommodated
by using a positive reference voltage to offset the input
+12V
113.5k ?
21k ?
V REF
9.3pF
voltage range so that it is always positive. To monitor a
negative input voltage, an attenuator can be used as shown
in Figure 28.
R2
–12V
114.3k ?
17.5k ?
MUX
V IN
R1
A IN(0–9)
9.3pF
+5V
83.5k ?
50k ?
4.6pF
Figure 28. Scaling and Offsetting A IN0 ? A IN9
for Negative Inputs
V BAT
49.5k ?
This offsets the negative voltage so that the ADC always
sees a positive voltage. R1 and R2 are chosen so that the
82.7k ?
* SEE TEXT
4.5pF
ADC input voltage is zero when the negative input voltage
is at its maximum (most negative) value, that is:
R1 +
+V CCP
21.9k
R2
V f s *
V OS
(eq. 4)
109.4k ?
18.5pF
This is a simple and low cost solution, but note the
following:
Figure 26. Voltage Measurement Inputs
Setting Other Input Ranges
A IN0 to A IN9 can easily be scaled to voltages other than
2.5 V or 3.0 V. If the input voltage range is zero to some
positive voltage, all that is required is an input attenuator, as
shown in Figure 27.
R1 A IN(0–9)
V IN
R2
Figure 27. Scaling A IN0 ? A IN9
? Because the input signal is offset but not inverted, the
input range is transposed. An increase in the magnitude
of the negative voltage (going more negative) causes the
input voltage to fall and give a lower output code from
the ADC. Conversely, a decrease in the magnitude of the
negative voltage causes the ADC code to increase. The
maximum negative voltage corresponds to zero output
from the ADC. This means that the upper and lower
limits are transposed.
? For the ADC output to be full scale when the negative
voltage is zero, V OS must be greater than the full ? scale
voltage of the ADC, because V OS is attenuated by R1 and
R2. If V OS is equal to or less than the full ? scale voltage
of the ADC, the input range is bipolar but not necessarily
symmetrical.
http://onsemi.com
17
相关PDF资料 |
PDF描述 |
|---|---|
| ECC06DRXH | CONN EDGECARD 12POS DIP .100 SLD |
| ASM28DSEF-S243 | CONN EDGECARD 56POS .156 EYELET |
| TAJX337M004RNJ | CAP TANT 330UF 4V 20% 2917 |
| GCM11DSEH | CONN EDGECARD 22POS .156 EYELET |
| EEC06DRAS | CONN EDGECARD 12POS R/A .100 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM1026JSTZ-REEL7 | 制造商:Analog Devices 功能描述:IC SYSTEM MONITOR 制造商:ON Semiconductor 功能描述:IC SYSTEM MONITOR |
| ADM1027 | 制造商:AD 制造商全称:Analog Devices 功能描述:dBCOOL-TM Remote Thermal Controller and Voltage Monitor |
| ADM1027ARQ | 功能描述:IC THER CTRL VOLT/MONITOR 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 |
| ADM1027ARQ-REEL | 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 |
| ADM1027ARQ-REEL7 | 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 |
发布紧急采购，3分钟左右您将得到回复。