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| 型号： | ADT7462ACPZ-R7 |
| 厂商： | ON Semiconductor |
| 文件页数： | 37/82页 |
| 文件大小： | 0K |
| 描述： | IC TEMP/VOLT MONITOR 32-LFCSP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi Product Discontinuation 30/Sept/2011 |
| 标准包装： | 1,500 |
| 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，外部传感器 |
| 精确度： | ±2.25°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： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 32-LFCSP（5x5） |
| 包装： | 带卷 (TR) |
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ADT7462
Programming the PWM MIN Registers
The PWM MIN registers are 8-bit registers that allow the
minimum PWM duty cycle for each output to be configured
anywhere from 0% to 100%. This allows the minimum
PWM duty cycle to be set 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 minimum PWM duty cycle of 50%,
100%
PWM MAX
PWM MIN
0%
Value (decimal) = 50/0.39 = 128 (decimal)
Value = 128 (decimal) or 0x80 (hexadecimal)
T MIN
TEMPERATURE
Example 2: For a minimum PWM duty cycle of 33%,
Value (decimal) = 33/0.39 = 85 (decimal)
Value = 85 (decimal) or 0x54 (hexadecimal)
PWM MIN Registers
Register 0x28, Minimum PWM1 Duty Cycle = 0x80
(50% Default)
Register 0x29, Minimum PWM2 Duty Cycle = 0x80
(50% Default)
Register 0x2A, Minimum PWM3 Duty Cycle = 0x80
(50% Default)
Register 0x2B, Minimum PWM4 Duty Cycle = 0x80
(50% Default)
Note on Fan Speed and PWM Duty Cycle
The PWM duty cycle does not directly correlate to fan
speed in rpm. Running a fan at 33% PWM duty cycle does
not equate to running the fan at 33% speed. Driving a fan at
33% PWM duty cycle actually runs the fan at closer to 50%
of its full speed. This is because fan speed in % rpm
generally relates to the square root of PWM duty cycle.
Given a PWM square wave as the drive signal, fan speed in
rpm approximates to:
% fanspeed + PWM duty cycle 10
Step 4 ? PWM MAX for PWM (Fan) Outputs
PWM MAX is the maximum duty cycle that each fan in the
system runs at under the automatic fan speed control loop.
For maximum system acoustic benefit, PWM MAX should be
as low as possible but should be capable of maintaining the
processo r temperature limit at an acceptable level. If the
THERM temperature limit is exceeded, the fans are still
boosted to 100% for fail-safe cooling.
There is one PWM MAX limit (Register 0x2C) for all fan
channels.
Figure 56. PWM MAX Determines Maximum PWM Duty
Cycle Below the THERM Temperature Limit
Programming the PWM MAX Register
The PWM MAX register (0x2C) is an 8-bit register that
allows the maximum PWM duty cycle for the outputs to be
configured anywhere from 0% to 100%. This allows the
maximum PWM duty cycle to be set in steps of 0.39%.
The value to be programmed into the PWM MAX register
is given by:
Value (decimal) = PWM MAX /0.39
Example 1: For a maximum PWM duty cycle of 50%,
Value (decimal) = 50/0.39 = 128 (decimal)
Value = 128 (decimal) or 0x80 (hexadecimal)
Example 2: For a maximum PWM duty cycle of 75%,
Value (decimal) = 75/0.39 = 192 (decimal)
Value = 192 (decimal) or 0xC0 (hexadecimal)
PWM MAX Register
Register 0x2C, Maximum PWM1 to PWM4 Duty
Cycle = 0xC0 (75% default)
See the Note on Fan Speed and PWM Duty Cycle section
for more information.
Step 5 ? T RANGE for Temperature Channels
T RANGE is the range of temperatures over which
automatic fan control occurs when the programmed T MIN
temperature is exceeded. T RANGE is a temperature slope, not
an arbitrary value; that is, a T RANGE of 40 ? C holds true only
for PWM MIN = 33%. If PWM MIN is increased or decreased,
the effective T RANGE changes.
T RANGE
100%
PWM MIN
0%
T MIN
TEMPERATURE
Figure 57. T RANGE Parameter Affects Cooling Slope
http://onsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADT7462ACPZ-REEL | 功能描述:监控电路 FLX H/WRE MON IC SRV RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| ADT7462ACPZ-REEL7 | 功能描述:IC TEMP/VOLT MONITOR 32-LFCSP 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 |
| ADT7462EBZEVB | 功能描述:EVALUATION BOARD ADT7462 制造商:on semiconductor 系列:* 零件状态:在售 标准包装:1 |
| ADT7462ZEVB | 功能描述:BOARD EVALUATION FOR ADT7462 RoHS:是 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB） 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| ADT7463 | 制造商:AD 制造商全称:Analog Devices 功能描述:dB COOL Remote Thermal Controller and Voltage Monitor |
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