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| 型号： | ADM1027ARQZ |
| 厂商： | ON Semiconductor |
| 文件页数： | 15/56页 |
| 文件大小： | 1822K |
| 描述： | IC THER CTRL VOLT/MONITOR 24QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi Product Discontinuation Notice 25/Aug/2008 Product Obsolescence 30/Sept/2009 |
| 标准包装： | 56 |
| 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： | 0°C ~ 105°C，外部传感器 |
| 精确度： | ±1°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： | 0°C ~ 105°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： | 管件 |
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REV. A
ADM1027
15
If a discrete transistor is used, the collector will not be grounded,
and should be linked to the base. If a PNP transistor is used, the
base is connected to the D input and the emitter to the D+
input. If an NPN transistor is used, the emitter is connected to
the D input and the base to the D+ input. Figure 14 shows
how to connect the ADM1027 to an NPN or PNP transistor for
temperature measurement. To prevent ground noise from inter-
fering 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.
To measure DV
be
, the sensor is switched between operating cur-
rents of I and N I. The resulting waveform is passed through a
65 kHz low-pass filter to remove noise, and to a chopper-stabilized
amplifier that performs the functions of amplification and recti-
fication of the waveform to produce a dc voltage proportional to
DV
be
. This voltage is measured by the ADC to give a temperature
output in 10-bit, twos complement format. To further reduce
the effects of noise, digital filtering is performed by averaging the
results of 16 measurement cycles. A remote temperature measure-
ment takes nominally 25.5 ms. The results of remote temperature
measurements are stored in 10-bit, twos complement format,
as illustrated in Table III. The extra resolution for the temperature
measurements is held in the Extended Resolution Register 2
(Reg. 0x77). This gives temperature readings with a resolution
of 0.25
o
C.
Table III. Temperature Data Format*
Temperature
Digital Output (10-Bit)
128rC
1000 0000 00
125rC
1000 0011 00
100rC
1001 1100 00
75rC
1011 0101 00
50rC
1100 1110 00
25rC
1110 0111 00
10
o
C
1111 0110 00
0rC
0000 0000 00
+10.25rC
0000 1010 01
+25.5rC
0001 1001 10
+50.75rC
0011 0010 11
+75rC
0100 1011 00
+100rC
0110 0100 00
+125rC
0111 1101 00
+127rC
0111 1111 00
*Bold denotes 2 LSBs of measurement in Extended Resolution
Register 2 (Reg. 0x77) with 0.25
o
C resolution.
ADM1027
2N3904
NPN
D+
D
Figure 14a. Measuring Temperature Using an
NPN Transistor
2N3906
PNP
ADM1027
D+
D
Figure 14b. Measuring Temperature Using a
PNP Transistor
NULLING OUT TEMPERATURE ERRORS
As CPUs run faster, it is getting more difficult to avoid high
frequency clocks when routing the D/D+ traces around a system
board. Even when recommended layout guidelines are followed,
there may still be temperature errors attributed to noise being
coupled onto the D+/D lines. High frequency noise generally
has the effect of giving temperature measurements that are too
high by a constant amount. The ADM1027 has temperature
offset registers at addresses 0x70, 0x71, and 0x72 for the Remote 1,
Local, and Remote 2 temperature channels. By doing a one-time
calibration of the system, you can determine the offset caused
by system board noise and null it out using the offset registers.
The offset registers automatically add a twos complement 8-bit
reading to every temperature measurement. The LSB adds a 1rC
offset to the temperature reading so the 8-bit register effectively
allows temperature offsets of up to 127rC with a resolution of
1rC. This ensures that the readings in the temperature measure-
ment registers are as accurate as possible.
TEMPERATURE OFFSET REGISTERS
Reg. 0x70 Remote 1 Temperature Offset = 0x00 (0rC default)
Reg. 0x71 Local Temperature Offset = 0x00 (0rC default)
Reg. 0x72 Remote 2 Temperature Offset = 0x00 (0rC default)
Rev. 3 | Page 15 of 56 | www.onsemi.com
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| ADM1027ARQZ-REEL | 功能描述:板上安装温度传感器 VOLT THRM MGMT CNTRLR IC 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 |
| ADM1027ARQZ-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 |
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| ADM1027ARQZ-RL71 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:dBCOOLa?￠ Remote Thermal Controller and Voltage Monitor |
| ADM1028 | 制造商:AD 制造商全称:Analog Devices 功能描述:Remote Thermal Diode Monitor with Linear Fan Control |
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