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参数资料
| 型号： | MAX6639FAEE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 15/22页 |
| 文件大小： | 234K |
| 描述： | IC 2CH TEMP MONITOR 16-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 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： | 0°C ~ 150°C，外部传感器 |
| 精确度： | -2.5°C 本地（最大），±1°C 远程（最大） |
| 拓扑： | ADC，PWM 发生器，转速计计数器 |
| 输出类型： | I²C?/SMBus? |
| 输出警报： | 是 |
| 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： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (TR) |
Fan 1 and 2 Configuration 2a (11h and 15h)
The following registers apply to the automatic RPM con-
trol mode:
" D[7:4]: Fan RPM (Tachometer) Step-Size A.
Selects the number of tachometer counts the target
value decreases for each temperature step increase
above the fan-start temperature. Value = n + 1 (1
through 16) where n is the value of D[7:4].
" D[3:2]: Temperature Step Size. Selects the temper-
ature increment for fan control. For each temperature
step increase, the target tachometer count decreas-
es by the value selected by D[7:4] (Table 8).
" D1: PWM Output Polarity. PWM output is low at
100% duty cycle when this bit is set to zero. PWM
output is high at 100% duty cycle when this bit is set
to 1.
" D0: Minimum Speed. Selects the value of the mini-
mum fan speed (when temperature is below the fan-
start temperature in the automatic RPM control
mode). Set to zero for 0% fan drive. Set to 1 to deter-
mine the minimum fan speed by the tachometer
count value in registers 22h and 23h (fan maximum
TACH).
Fan 1 and 2 Configuration 2b (12h and 16h)
The following registers select the tachometer step sizes
and number of steps for step-size A to step-size B
slope changes (see Figure 1):
" D[7:4]: RPM (Tachometer) Step Size B. Selects
number of tachometer counts the target value
decreases for each temperature step increase after
the number of steps selected by D[3:0]. Value = n +
1 (1 through 16) where n is the value of D[7:4].
" D[3:0]: Selects the number of temperature/tachome-
ter steps above the fan-start temperature at which
step-size B begins.
Fan 1 and Fan 2 Configuration 3 (13h and 17h)
The following registers control fan spin-up, PWM output
frequency, pulse stretching, and THERM to fan full-
speed enable:
" D7: Fan Spin-Up Disable. Set to zero to enable fan
spin-up. Whenever the fan starts up from zero drive,
it is driven with 100% duty cycle for 2s to ensure that
it starts. Set to 1 to disable the spin-up function.
" D6: THERM to Full-Speed Enable. When this bit is
1, THERM going low (either by being pulled low
externally or by the measured temperature exceed-
ing the THERM limit) forces the fan to full speed. In
all modes, this happens at the rate determined by
the rate-of-change selection. When THERM is
deasserted (even if the fan has not reached full
speed), the speed falls at the selected rate-of-
change to the target speed.
" D5: Disable Pulse Stretching. Pulse stretching is
enabled when this bit is set to zero. When modulat-
ing the fans power supply with the PWM signal, the
PWM pulses are periodically stretched to keep the
tachometer signal available for one full revolution.
Setting this bit to 1 disables pulse stretching. The
MAX6639 still measures the fan speed but does not
stretch the pulses for measurements, so the fans
power supply must not be pulse modulated.
" D[1:0]: PWM Output Frequency. These bits control
the PWM output frequency as shown in Table 9.
Fan Tach Count 1 and 2 (20h and 21h)
These registers have the latest tachometer measure-
ment of the corresponding channel. This is inversely
proportional to the fans speed. The fan RPM range
should be set so this count falls in the 30 to 160 range
for normal fan operation.
Fan Start Tach Count/Target Tach Count
(22h and 23h)
D[7:0]: This sets the starting tachometer count for the
fan in automatic RPM mode. Depending on the setting
of the minimum duty-cycle bit, the tachometer count
has this value either at all temperatures below the fan-
start temperature or the count is zero below the fan-
start temperature and has this value when the fan-start
temperature is reached. These registers are the target
tach count when in manual RPM mode.
2-Channel Temperature Monitor with Dual,
Automatic, PWM Fan-Speed Controller
Maxim Integrated
15
MAX6639/MAX6639F
REGISTER 11h
OR 15h
FAN CONTROL TEMPERATURE
STEP SIZE (?/SPAN>C)
00
1
01
2
10
4
11
8
Table 8. Temperature Step Size
REGISTERS
13h AND 16h
LOW-FREQUENCY
(Hz) REGISTER
04h D3 = 0
HIGH-FREQUENCY
(kHz) REGISTER
04h D3 = 1
00
20
5
01
33.33
8.33
10
50
12.5
11
100
25
Table 9. Fan PWM Frequency
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6639FATE+ | 功能描述:板上安装温度传感器 2Ch Temperature Monitor 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 |
| MAX6639FATE+T | 功能描述:板上安装温度传感器 2Ch Temperature Monitor 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 |
| MAX6639YAEE+ | 功能描述:板上安装温度传感器 2Ch Temperature Monitor 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 |
| MAX6639YAEE+T | 功能描述:板上安装温度传感器 2Ch Temperature Monitor 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 |
| MAX663C/D | 功能描述:低压差稳压器 - LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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