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| 型号： | ADT7476AARQZ-R |
| 厂商： | ON Semiconductor |
| 文件页数： | 21/66页 |
| 文件大小： | 945K |
| 描述： | IC REMOTE THERMAL CTLR 24QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi QSOP 24ld Pkg (MSL) Change 17/Jun/2010 |
| 标准包装： | 2,500 |
| 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： | -40°C ~ 125°C |
| 精确度： | ±2.5% |
| 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 ~ 3.6 V |
| 工作温度： | -40°C ~ 125°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： | 带卷 (TR) |
| 其它名称： | ADT7476AARQZ-R-ND ADT7476AARQZ-ROSTR |
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ADT7476A
http://onsemi.com
21
Table 29. INTERRUPT STATUS REGISTER 2 (0x42)
Bit
Mnemonic
Description
[7]
D2
1 indicates an open or short on
D2+/D2 inputs.
[6]
D1
1 indicates an open or short on
D1+/D1 inputs.
[5]
F4P
1 indicates Fan 4 has dropped below
minimum speed. Alternatively, indicates
that the THERM
limit has been
exceeded, if the THERM
function is
used. Alternatively, indicates the status
of GPIO6.
[4]
FAN3
1 indicates that Fan 3 has dropped
below minimum speed.
[3]
FAN2
1 indicates that Fan 2 has dropped
below minimum speed.
[2]
FAN1
1 indicates that Fan 1 has dropped
below minimum speed.
[1]
OVT
1 indicates that a THERM
overtemperature limit has been
exceeded.
[0]
12 V/VC
1 indicates a 12 V high or low limit has
been exceeded. If the VID code change
function is used, this bit indicates a
change in VID code on the VID0 to
VID4 inputs.
SMBALERT
Interrupt Behavior
The ADT7476A can be polled for status, or an
SMBALERT
interrupt can be generated for out-of-limit
conditions. It is important to note how the SMBALERT
output and status bits behave when writing interrupt handler
software.
Figure 29. SMBALERT
and Status Bit Behavior
HIGH LIMIT
TEMPERATURE
STICKY
STATUS BIT
SMBALERT
CLEARED ON READ
(TEMP BELOW LIMIT)
TEMP BACK IN LIMIT
(STATUS BIT STAYS SET)
HIGH LIMIT
TEMPERATURE
STICKY
STATUS BIT
SMBALERT
Figure 29 shows how the SMBALERT
output and sticky
status bits behave. Once a limit is exceeded, the
corresponding status bit is set to 1. The status bit remains set
until the error condition subsides and the status register is
read. The status bits are referred to as sticky because they
remain set until read by software. This ensures that an
out-of-limit event cannot be missed if the software is
periodically polling the device.
Note that:
?SPAN class="pst ADT7476AARQZ-R_2298076_4"> The SMBALERT
output remains low for the entire
duration that a reading is out-of-limit and until the
status register has been read. This has implications on
how software handles the interrupt.
?SPAN class="pst ADT7476AARQZ-R_2298076_4"> THERM
overtemperature events are not sticky. They
reset immediately after the overtemperature condition
ceases.
Handling SMBALERT
Interrupts
To prevent the system from being tied up servicing
interrupts, it is recommend to handle the SMBALERT
interrupt as follows:
1. Detect the SMBALERT
assertion.
2. Enter the interrupt handler.
3. Read the status registers to identify the interrupt
source.
4. Mask the interrupt source by setting the
appropriate mask bit in the interrupt mask registers
(0x74 and 0x75).
5. Take the appropriate action for a given interrupt
source.
6. Exit the interrupt handler.
7. Periodically poll the status registers. If the
interrupt status bit has cleared, reset the
corresponding interrupt mask bit to 0. This causes
the SMBALERT
output and status bits to behave
as shown in Figure 30.
Figure 30. How Masking the Interrupt Source Affects
SMBALERT
Output
HIGH LIMIT
TEMPERATURE
STICKY
STATUS BIT
SMBALERT
CLEARED ON READ
(TEMP BELOW LIMIT)
TEMP BACK IN LIMIT
(STATUS BIT STAYS SET)
INTERRUPT
MASK BIT SET
INTERRUPT MASK BIT
CLEARED
(SMBALERT
RE-ARMED)
Masking Interrupt Sources
Interrupt Mask Register 1 (0x74) and Interrupt Mask
Register 2 (0x75) allow individual interrupt sources to be
masked to prevent SMBALERT
interrupts.
NOTE: Masking an interrupt source prevents only the SMBALERT
output from being asserted; the appropriate status bit is set
normally.
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| ADT7476AARQZ-REEL | 功能描述:IC REMOTE THERMAL CTRLR 24-QSOP 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 |
| ADT7476AARQZ-REEL7 | 功能描述:IC REMOTE THERMAL CTRLR 24-QSOP 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 |
| ADT7476AARQZ-RL7 | 功能描述:板上安装温度传感器 MONITORS 5V/4 FANS 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 |
| ADT7476ARQH | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:dBCOOL Remote Thermal Controller and Voltage Monitor |
| ADT7476ARQH-REEL | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:dBCOOL Remote Thermal Controller and Voltage Monitor |
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