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参数资料
| 型号： | ADM1030ARQZ-REEL7 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 温度/湿度传感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 1Cel, RECTANGULAR, SURFACE MOUNT |
| 封装： | MO-137AB, QSOP-16 |
| 文件页数： | 3/28页 |
| 文件大小： | 495K |
| 代理商： | ADM1030ARQZ-REEL7 |
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REV. A
ADM1030
–11–
asserted low. The behavior of the high limit and
THERM limit
is as follows:
1. Whenever the temperature measured exceeds the high tem-
perature limit, the
INT pin is asserted low.
2. If the temperature exceeds the
THERM limit, the THERM
output asserts low. This can be used to throttle the CPU
clock. If the
THERM-to-Fan Enable bit (Bit 7 of THERM
behavior/revision register) is cleared to 0, the fan will not run
full-speed. The
THERM limit may be programmed at a
lower temperature than the high temperature limit. This
allows the system to run in silent mode, where the CPU can
be throttled while the cooling fan is off. If the temperature
continues to increase, and exceeds the high temperature limit,
an
INT is generated. Software may then decide whether the
fan should run to cool the CPU. This allows the system to
run in SILENT MODE.
3. If the
THERM-to-Fan Enable bit is set to 1, the fan will run
full-speed whenever
THERM is asserted low. In this case,
both throttling and active cooling take place. If the high
temperature limit is programmed to a lower value than the
THERM limit, exceeding the high temperature limit will
assert
INT low. Software could change the speed of the fan
depending on temperature readings. If the temperature con-
tinues to increase and exceeds the
THERM limit, THERM
asserts low to throttle the CPU and the fan runs full-speed.
This allows the system to run in PERFORMANCE MODE,
where active cooling takes place and the CPU is only throttled
at high temperature.
Using the high temperature limit and the
THERM limit in this
way allows the user to gain maximum performance from the system
by only slowing it down, should it be at a critical temperature.
Although the ADM1030 does not have a dedicated Interrupt
Mask Register, clearing the appropriate enable bits in Configu-
ration Register 2 will clear the appropriate interrupts and mask
out future interrupts on that channel. Disabling interrupt bits
will prevent out-of-limit conditions from generating an interrupt
or setting a bit in the Status Registers.
USING
THERM AS AN INPUT
The
THERM pin is an open-drain input/output pin. When used
as an output, it signals over-temperature conditions. When
asserted low as an output, the fan will be driven full-speed if the
THERM-to-Fan Enable bit is set to 1 (Bit 7 of Register 0x3F).
When
THERM is pulled low as an input, the THERM bit (Bit 7)
of Status Register 2 is set to 1, and the fan is driven full-speed.
Note that the
THERM-to-Fan Enable bit has no effect when-
ever
THERM is used as an input. If THERM is pulled low as
an input, and the
THERM-to-Fan Enable bit = 0, the fan will
still be driven full-speed. The
THERM-to-Fan Enable bit only
affects the behavior of
THERM when used as an output.
STATUS REGISTERS
All out-of-limit conditions are flagged by status bits in Status
Registers 1 and 2 (0x02, 0x03). Bits 0 and 1 (Alarm Speed, Fan
Fault) of Status Register 1, once set, may be cleared by reading
Status Register 1. Once the Alarm Speed bit is cleared, this bit
will not be reasserted on the next monitoring cycle even if the
condition still persists. This bit may be reasserted only if the
fan is no longer at Alarm Speed. Bit 1 (Fan Fault) is set whenever
a fan tach failure is detected.
Once cleared, it will reassert on subsequent fan tach failures.
Bits 2 and 3 of Status Register 1 are the Remote Temperature
High and Low status bits. Exceeding the high or low temperature
limits for the external channel sets these status bits. Reading the
status register clears these bits. However, these bits will be reasserted
if the out-of limit condition still exists on the next monitoring
cycle. Bits 6 and 7 are the Local Temperature High and Low
status bits. These behave exactly the same as the Remote Temper-
ature High and Low status bits. Bit 4 of Status Register 1 indicates
that the Remote Temperature THERM limit has been exceeded.
This bit gets cleared on a read of Status Register 1 (see Figure 5).
Bit 5 indicates a Remote Diode Error. This bit will be a 1 if a
short or open is detected on the Remote Temperature channel
on power-up. If this bit is set to 1 on power-up, it cannot be
cleared. Bit 6 of Status Register 2 (0x03) indicates that the
Local THERM limit has been exceeded. This bit is cleared on a
read of Status Register 2. Bit 7 indicates that
THERM has been
pulled low as an input. This bit can also be cleared on a read of
Status Register 2.
5
INT REARMED
STATUS REG. READ
TEMP
THERM LIMIT
THERM
INT
Figure 5. Operation of
THERM and INT Signals
Figure 5 shows the interaction between
INT and THERM.
Once a critical temperature THERM limit is exceeded, both
INT and THERM assert low. Reading the Status Registers
clears the interrupt and the
INT pin goes high. However, the
THERM pin remains asserted until the measured temperature
falls 5
∞C below the exceeded THERM limit. This feature can be
used to CPU throttle or drive a fan full-speed for maximum
cooling. Note, that the
INT pin for that interrupt source is not
rearmed until the temperature has fallen below the THERM
limit –5
∞C. This prevents unnecessary interrupts from tying up
valuable CPU resources.
MODES OF OPERATION
The ADM1030 has four different modes of operation. These
modes determine the behavior of the system.
1. Automatic Fan Speed Control Mode.
2. Filtered Automatic Fan Speed Control Mode.
3. PWM Duty Cycle Select Mode (directly sets fan speed under
software control).
4. RPM Feedback Mode.
相关PDF资料 |
PDF描述 |
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| ADM1030ARQZ | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 1Cel, RECTANGULAR, SURFACE MOUNT |
| ADM1030ARQ | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 1Cel, RECTANGULAR, SURFACE MOUNT |
| ADM1031ARQZ-R7 | DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT |
| ADM1031ARQZ-REEL | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT |
| ADM1031ARQZ-REEL7 | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM1030ARQZ-RL7 | 功能描述:IC SNSR TEMP/FAN PWM CTRL 16QSOP RoHS:是 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 |
| ADM1031 | 制造商:AD 制造商全称:Analog Devices 功能描述:Intelligent Temperature Monitor and Dual PWM Fan Controller |
| ADM1031ARQ | 功能描述:IC SENSOR 2-TEMP/FAN CTRL 16QSOP 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 |
| ADM1031ARQ-ND | 制造商:ON Semiconductor 功能描述: |
| ADM1031ARQ-REEL | 功能描述:IC SENSOR 2-TEMP/FAN CTRL 16QSOP 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 |
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