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参数资料
| 型号： | ADT7476AARQZ-RL7 |
| 厂商： | ON Semiconductor |
| 文件页数： | 24/66页 |
| 文件大小： | 945K |
| 描述： | IC REMOTE THERMAL CTLR 24-QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi QSOP 24ld Pkg (MSL) Change 17/Jun/2010 Product Discontinuation 30/Sept/2011 |
| 标准包装： | 1,000 |
| 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) |
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ADT7476A
http://onsemi.com
24
Figure 33. Functional Block Diagram of THERM
Monitoring Circuitry
COMPARATOR
THERM
2.914 s
1.457 s
728.32 ms
364.16 ms
91.04 ms
45.52 ms
22.76 ms
182.08 ms
THERM
LIMIT
(REG. 0x7A)
2.914 s
1.457 s
728.32 ms
364.16 ms
91.04 ms
45.52 ms
22.76 ms
182.08 ms
THERM
TIMER
(REG. 0x79)
THERM
TIMER CLEARED ON READ
SMBALERT
F4P BIT (BIT 5)
MASK REGISTER 2 (REG. 0x75)
CLEARED
ON READ
F4P BIT (BIT 5)
STATUS REGISTER 2
OUT
IN
RESET
LATCH
1 = MASK
0 1 2 3 4 5 6 7
0
1
2
3
4
5
6
7
Configuring the Relevant THERM
Behavior
1. Configure the desired pin as the THERM
timer
input.
Setting Bit 1 (THERM
timer enable) of
Configuration Register 3 (0x78) enables the
THERM
timer monitoring functionality. This is
disabled on Pin 14 and Pin 22 by default.
Setting Bit 0 and Bit 1 (PIN14FUNC) of
Configuration Register 4 (0x7D) enables THERM
timer output functionality on Pin 22 (Bit 1 of
Configuration Register 3, THERM
, must also be
set). Pin 14 can also be used as TACH4.
2. Select the desired fan behavior for THERM
timer
events.
Assuming the fans are running, setting Bit 2
(BOOST bit) of Configuration Register 3 (0x78)
causes all fans to run at 100% duty cycle whenever
THERM
is asserted. This allows fail-safe system
cooling. If this bit is 0, the fans run at their current
settings and are not affected by THERM
events. If
the fans are not already running when THERM
is asserted, then the fans do not run to full speed.
3. Select whether THERM
timer events should
generate SMBALERT
interrupts.
Setting Bit 5 (F4P) of Mask Register 2 (0x75) or
Bit 0 of Mask Register 1 (0x74), depending on
which pins are configured as a THERM timer,
masks SMBALERT
s when the THERM
timer limit
value is exceeded. This bit should be cleared if
SMBALERT
s based on THERM
events are
required.
4. Select a suitable THERM
limit value.
This value determines whether an SMBALERT
is
generated on the first THERM
assertion, or if only
a cumulative THERM
assertion time limit is
exceeded. A value of 0x00 causes an SMBALERT
to be generated on the first THERM
assertion.
5. Select a THERM
monitoring time.
This value specifies how often OS- or BIOS-level
software checks the THERM
timer. For example,
BIOS can read the THERM
timer once an hour to
determine the cumulative THERM
assertion time.
If, for example, the total THERM
assertion time is
<22.76 ms in Hour 1, >182.08 ms in Hour 2, and
>5.825 s in Hour 3, system performance is
degrading significantly because THERM
is
asserting more frequently on an hourly basis.
Alternatively, OS- or BIOS-level software can
timestamp when the system is powered on. If an
SMBALERT
is generated due to the THERM
timer limit being exceeded, another timestamp can
be taken. The difference in time can be calculated
for a fixed THERM
timer limit time. For example,
if it takes one week for a THERM
timer limit of
2.914 sec to be exceeded, and the next time it takes
only 1 hour, then a serious degradation in system
performance has occurred.
Configuring the THERM
Pin as an Output
In addition to monitoring THERM
as an input, the
ADT7476A can optionally drive THERM
low as an output.
When PROCHOT
is bidirectional, THERM
can be used to
throttle the processor by asserting PROCHOT
. The user can
preprogram system-critical thermal limits. If the
temperature exceeds a thermal limit by 0.25癈, THERM
asserts low. If the temperature is still above the thermal limit
on the next monitoring cycle, THERM
stays low. THERM
remains asserted low until the temperature is equal to or
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相关代理商/技术参数 |
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|---|---|
| ADT7476ARQH | 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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| ADT7476ARQZ | 功能描述:马达/运动/点火控制器和驱动器 MLTCH TDM FAN CTRLR RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| ADT7476ARQZ-R7 | 功能描述:马达/运动/点火控制器和驱动器 MLTICH TDM FAN CTRLR RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| ADT7476ARQZ-REEL | 功能描述:马达/运动/点火控制器和驱动器 MLTICH TDM FAN CTRLR RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
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