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| 型号： | ADT7476ARQZ |
| 厂商： | ON Semiconductor |
| 文件页数： | 30/65页 |
| 文件大小： | 0K |
| 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 Product Discontinuation 30/Sept/2011 |
| 标准包装： | 56 |
| 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： | 管件 |
| 其它名称： | ADT7476ARQZ-ND ADT7476ARQZOS |
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ADT7476
dc bits are automatically asserted internally and do not need
to be changed.
Fan Speed Control
The ADT7476 controls fan speed using automatic and
manual modes:
? In automatic fan speed control mode, fan speed is
automatically varied with temperature and without CPU
intervention once initial parameters are set up. The
advantage is that if the system hangs, the user is
guaranteed that the system is protected from
overheating.
? In manual fan speed control mode, the ADT7476
allows the duty cycle of any PWM output to be
Programming T RANGE
T RANGE defines the distance between T MIN and 100%
PWM. For the ADT7467, ADT7468 and ADT7473, T RANGE
is effectively a slope. For the ADT7475 andADT7476,
T RANGE is no longer a slope, but defines the temperature
region where the PWM output linearly ramps from PWM MIN
to 100% PWM.
PWM = 100%
PWM MAX
adjusted manually. This can be useful if the user wants
to change fan speed in software or adjust PWM duty
cycle output for test purposes. Bits [7:5] of Register
0x5C to Register 0x5E (PWM Configuration) control
the behavior of each PWM output.
PWM MIN
PWM = 0%
T RANGE
T MIN
Figure 46. T RANGE
Table 42. PWM CONFIGURATION
(REG. 0X5C TO 0X5E) BITS
Bit Mnemonic Description
[7:5] BHVR 111 = Manual Mode
Once under manual control, each PWM output can be
manually updated by writing to Register 0x30 to Register
0x32 (PWM current duty cycle registers).
Programming the PWM Current Duty Cycle Registers
The PWM current duty cycle registers are 8-bit registers
that allow the PWM duty cycle for each output to be set
anywhere from 0% to 100% in steps of 0.39%. The value to
be programmed into the PWM MIN register is given by:
Value (decimal) = PWM MIN /0.39
Example 1:
For a PWM duty cycle of 50%,
Value (decimal) = 50/0.39 = 128 (decimal)
Value = 128 (decimal) or 0x80 (hex)
Example 2:
For a PWM duty cycle of 33%,
Value (decimal) = 33/0.39 = 85 (decimal)
Value = 85 (decimal) or 0x54 (hex)
Table 43. PW M CURRENT DUTY CYCL E REGISTERS
Programming the Automatic Fan Speed Control Loop
To understand the automatic fan speed control loop more
efficiently, it is recommended to use the ADT7476
evaluation board and software while reading this section.
This section provides the system designer with an
understanding of the automatic fan control loop and
provides step-by-step guidance on effectively evaluating
and selecting critical system parameters. To optimize the
system characteristics, the designer needs to give some
thought to system configuration, including the number of
fans, where they are located, and what temperatures are
being measured in the particular system.
The mechanical or thermal engineer who is tasked with
the system thermal characterization should also be involved
at the beginning of the system development process.
Manual Fan Control Overview
In unusual circumstances, it can be necessary to manually
control the speed of the fans. Because the ADT7476 has an
SMBus interface, a system can read back all necessary
voltage, fan speed, and temperature information, and use
this information to control the speed of the fans by writing
to the PWM current duty cycle register (0x30, 0x31, and
0x32) of the appropriate fan. Bits [7:5] of the PWMx
configuration registers (0x5C, 0x5D, 0x5E) are used to set
fans up for manual control.
Register
0x30
0x31
0x32
Description
PWM1 Current Duty Cycle
PWM2 Current Duty Cycle
PWM3 Current Duty Cycle
Default
0xFF (100%)
0xFF (100%)
0xFF (100%)
THERM Operation in Manual Mode
In manual mode, if the temperature increases above the
programmed THERM temperature limit, the fans
automatically speed up to maximum PWM or 100% PWM,
whichever way the appropriate fan channel is configured.
By reading the PWMx current duty cycle registers, the
user can keep track of the current duty cycle on each PWM
output, even when the fans are running in automatic fan
speed control mode or acoustic enhancement mode.
Automatic Fan Control Overview
The ADT7476 can automatically control the speed of fans
based on the measured temperature. This is done
http://onsemi.com
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| 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 |
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| ADT7476ARQZ-REEL7 | 功能描述:IC REMOTE THERMAL CTRLR 24QSOP 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 |
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