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| 型号： | ADM1026JST-REEL |
| 厂商： | ON Semiconductor |
| 文件页数： | 27/55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
START OF ANALOG OUT-OF-LIMIT
MONITORING CYCLE MEASUREMENT
LOCAL TEMPEREATURE START OF ANALOG
MEASUREMENT MONITORING CYCLE
LOCAL TEMPERATURE
MEASUREMENT
START OF ANALOG
MONITORING CYCLE
INT
INT
CLEARED
NEW INT
FROM FAN
INT
CLEARED
GPIO DE ? ASSERTED
NEW INT
FROM GPIO
INT RE ? ASSERTED
Figure 50. Other Interrupt Sources Can Reassert INT Immediately
Status Register 4 also stores inputs from two other
interrupt sources that operate in a different way from the
other status bits. If automatic fan speed control (AFC) is
enabled, Bit 4 of Status Register 4 is set whenever a fan starts
or stops. This bit causes a one-off INT output as shown in
Figure 51. It is cleared during the next monitoring cycle and
if INT has been cleared, it does not cause INT to be
reasserted.
FAN ON
FAN OFF
INT
INT CLEARED BY STATUS REGULAR 1 READ, BIT 2
OF CONFIGURATION REGULAR 1 SET, OR ARA
Figure 51. Assertion of INT Due to AFC Event
In a similar way, a change of state at the THERM output
(described in more detail later), sets Bit 3 of Status
Register 4 and causes a one-off INT output. A change of
state at the THERM output also causes Bit 0 of Status
Register 1, Bit 1 of Status Register 1, or Bit 0 of Status
Register 4 to be set, depending on which temperature
channel caused the THERM event. This bit is reset during
the next monitoring cycle, provided the temperature channel
is within the normal high and low limits.
Fan Inputs
Fan inputs generate interrupts in a similar way to
analog/temperature inputs, but as the analog/temperature
inputs and fan inputs have different monitoring cycles, they
have separate interrupt circuits. As the speed of each fan is
measured, the output of the fan speed counter is stored in a
value register. The result is compared to the fan speed limit
and is used to set or clear a bit in Status Register 3. In this
case, the fan is monitored only for underspeed (fan counter
> fan speed limit). Mask Register 3 is used to mask fan
interrupts. After mask gating, the fan status bits are OR’ed
together and used to set a latch, whose output is OR’ed with
other interrupt sources to produce the INT output.
Like the analog/temp interrupt, an INT output caused by an
out ? of ? limit fan speed measurement, once cleared, is not
reasserted until the end of the next monitoring cycle, although
other interrupt sources may cause INT to be asserted.
GPIO and CI Pins. When GPIO pins are configured as
inputs, asserting a GPIO input (high or low, depending on
polarity) sets the corresponding GPIO status bit in Status
Registers 5 and 6, or Bit 7 of Status Register 4 (GPIO16). A
chassis intrusion event sets Bit 6 of Status Register 4.
The GPIO and CI status bits, after mask gating, are OR’ed
together and OR’ed with other interrupt sources to produce
the INT output. GPIO and CI interrupts are not latched and
cannot be cleared by normal interrupt clearing. They can
only be cleared by masking the status bits or by removing the
source of the interrupt.
Enabling and Clearing Interrupts
The INT output is enabled when Bit 1 of Configuration
Register 1 (INT_Enable) is high, and Bit 2 (INT_Clear) is
low. INT may be cleared if:
? Status Register 1 is read. Ideally, if polling the status
registers trying to identify interrupt sources, Status
Register 1 should be polled last, because a read of Status
Register 1 clears all the other interrupt status registers.
? The ADM1026 receives the alert response address
(ARA) (0001 100) over the SMBus.
? Bit 2 of Configuration Register 1 is set.
Bidirectional THERM Pin
The ADM1026 has a second interrupt pin (GPIO16/
THERM Pin 42) that responds only to critical thermal
events. The THERM pin goes low whenever a THERM limit
is exceeded. This function is useful for CPU throttlin g or
system shutdown. In addition, whenever THERM is
activated, the PWM and DAC outputs go full scale to
provide fail-safe system cooling. This output is enabled by
setting Bit 4 of Configuration Register 1 (Register 00h).
Whenever a THERM limit is exceeded, Bit 3 of Status
Register 4 (Reg 23h) is set, even if the THERM function is
disabled (Bit 4 of Configuration Register 1 = 0). In this case,
the THERM status bit is set, but the PWM and DAC outputs
are not forced to full scale.
Three thermal limit registers are provided for the three
temperature sensors at Addresses 0Dh to 0Fh. These registers
are dedicated to the THERM function and none of the other
limit registers have any effect on the THERM output.
If any of the temperature measurements exceed the
corresponding limit, THERM is asserted (low) and the DAC
and PWM outputs go to maximum to drive any cooling fans
to full speed.
To avoid cooling fans cycling on and off continually when
the temperature is close to the limit, a fixed hysteresis of 5 ? C
http://onsemi.com
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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 |
| ADM1026JSTZ-REEL | 功能描述:板上安装温度传感器 HI INT SYS MONITR 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 |
| 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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