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| 型号： | ADM1026JST-REEL |
| 厂商： | ON Semiconductor |
| 文件页数： | 25/55页 |
| 文件大小： | 0K |
| 描述： | IC CNTRL SYS REF/EEPROM 48LQFP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi Product Obsolescence 30/Sept/2009 |
| 标准包装： | 2,000 |
| 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： | 带卷 (TR) |
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ADM1026
Table 9 shows the relationship between fan speed and time
per revolution at 60%, 70%, and 100% of nominal RPM for
fan speeds of 1100, 2200, 4400, and 8800 RPM, and the
divisor that would be used for each of these fans, based on
two tach pulses per revolution.
Limit Values
Fans generally do not over-speed if run from the correct
voltage, so the failure condition of interest is under speed
due to electrical or mechanical failure. For this reason, only
low speed limits are programmed into the limit registers for
the fans. It should be noted that because fan period rather
than speed is being measured, a fan failure interrupt occurs
when the measurement exceeds the limit value.
Fan Monitoring Cycle Time
The fan speeds are measured in sequence from 0 to 7. The
monitoring cycle time depends on the fan speed, the number
of tach output pulses per revolution, and the number of fans
being monitored.
If a fan is stopped or running so slowly that the fan speed
counter reaches 255 before the second tach pulse after
initialization or before the fourth tach pulse during
measurement, the measurement is terminated. This also
occurs if an input is configured as GPIO instead of fan. Any
channels connected in this manner time out after 255 clock
pulses.
The worst-case measurement time for a fan ? configured
channel occurs when the counter reaches 254 from start to
the second tach pulse and reaches 255 after the second tach
pulse. Taking into account the tolerance of the oscillator
frequency, the worst-case measurement time is:
509 D 0.05 ms (eq. 17)
where:
509 is the total number of clock pulses.
D is the divisor: 1, 2, 4, or 8.
0.05 ms is the worst-case oscillator period in ms.
The worst-case fan monitoring cycle time is the sum of the
worst-case measurement time for each fan.
Although the fan monitoring cycle and the analog input
monitoring cycle are started together, they are not
synchronized in any other way.
Table 9. FAN SPEEDS AND DIVISORS
Time Per
Divisor RPM
? 1
? 2
? 4
? 8
Nominal Rev
8800
4400
2200
1100
RPM (ms)
6.82
13.64
27.27
54.54
70% RPM
6160
3080
1540
770
Rev 70% (ms)
9.74
19.48
38.96
77.92
60% RPM
5280
2640
1320
660
Rev 60% (ms)
11.36
22.73
45.45
90.9
CI
10k ?
Chassis Intrusion Input
The chassis intrusion input is an active high input intended
for detection and signaling of unauthorized tampering with
the system. When this input goes high, the event is latched
in Bit 6 of Status Register 4, and an interrupt is generated.
The bit remains set until cleared by writing a 1 to CI clear,
Bit 1 of Configuration Register 3 (05h), as long as battery
voltage is connected to the V BAT input. The CI clear bit itself
is cleared by writing a 0 to it.
The CI input detects chassis intrusion events even when
the ADM1026 is powered off (provided battery voltage is
applied to V BAT ) but does not immediately generate an
interrupt. Once a chassis intrusion event is detected and
The chassis intrusion input can also be used for other types
of alarm input. Figure 48 shows a temperature alarm circuit
using an AD22105 temperature switch sensor. This
produces a low-going output when the preset temperature is
exceeded, so the output is inverted by Q1 to make it
compatible with the CI input. Q1 can be almost any
small-signal NPN transistor, or a TTL or CMOS inverter
gate may be used if one is available.
V CC
R1
6 7
AD22105 18
R SET TEMPERATURE
SENSOR
1 Q1
latched, an interrupt is generated when the system is
powered on.
The actual detection of chassis intrusion is performed by
3
2
an external circuit that detects, for example, when the cover
has been removed. A wide variety of techniques may be used
for the detection, for example:
? A Microswitch that Opens or Closes when the Cover is
Removed
? A Reed Switch Operated by Magnet Fixed to the Cover
? A Hall-effect Switch Operated by Magnet Fixed to the
Cover
? A Phototransistor that Detects Light when the Cover is
Removed
Figure 48. Using the CI Input with a Temperature Sensor
General-Purpose I/O Pins (Open Drain)
The ADM1026 has eight pins that are dedicated to
general-purpose logic input/output (Pins 1, 2, and 43 to 48),
eight pins that can be configured as general-purpose logic
pins or fan speed inputs (Pins 3 to 6, and 9 to 12), and one
pin that can be configured as GPIO16 or the bidirectional
THERM pin (Pin 42). The GPIO/FAN pins are configured
as general-purpose logic pins by setting Bits 0 to 7 of
http://onsemi.com
25
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| ADM1026JST-REEL7 | 功能描述:IC CNTRL SYS REF/EEPROM 48LQFP RoHS:否 类别:集成电路 (IC) >> PMIC - 热管理 系列:- 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 |
| ADM1026JSTZ | 功能描述:PMIC 解决方案 HI INT SYS MONITR IC RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| ADM1026JSTZ-R7 | 功能描述:PMIC 解决方案 HI INT SYS MONITR IC RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
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| 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 |
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