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| 型号： | MAX6639ATE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 18/22页 |
| 文件大小： | 0K |
| 描述： | IC TEMP MONITOR 2CH 16-TQFN |
| 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°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-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
MAX6639/MAX6639F
2-Channel Temperature Monitor with Dual,
Automatic, PWM Fan-Speed Controller
Table 11. Summary of Fan-Drive Options
FIGURE
6
7
8
9
10
DESCRIPTION
High-side PWM drive
Low-side PWM drive
High-side PWM drive with keep-alive supply
High-side linear supply
4-wire fan with PWM speed-control input
PULSE STRETCHING
Yes
Yes
No
No
No
PWM FREQUENCY
Low
Low
Low
High
High
PWM POLARITY
Negative
Positive
Negative
Positive
Positive
? ?
= T
T M ACTUAL ?
?
T ACTUAL = T M ? NOMINAL ? = T M ?
? = T M ( 1 . 00599 )
Quick-Start Guide for 8000RPM 4-Pole
(2 Pulses per Revolution) Fan in Automatic
RPM Mode Using the Circuit of Figure 7
1) Write 02h to register 11h to set the PWM output to
drive the n-channel MOSFET.
2) Write 4Bh to register 22h to set the minimum RPM to
3200.
3) Write 5Eh to register 24h to set the pulses per revo-
lution to 2 and to set the maximum RPM speed to
8000RPM.
4) Write 19h to register 28h to set the fan-start temper-
ature to +25°C.
5) Write D2h to register 10h to start automatic
RPM mode.
Remote-Diode Considerations
Temperature accuracy depends upon having a good-
quality, diode-connected, small-signal transistor.
Accuracy has been experimentally verified for all the
devices listed in Table 12. The MAX6639 can also
directly measure the die temperature of CPUs and
other ICs with on-board temperature-sensing diodes.
The transistor must be a small-signal type with a rela-
tively high forward voltage. This ensures that the input
voltage is within the A/D input voltage range. The for-
ward voltage must be greater than 0.25V at 10μA at the
highest expected temperature. The forward voltage
must be less than 0.95V at 100μA at the lowest expect-
ed temperature. The base resistance has to be less
than 100 Ω . Tight specification of forward-current gain
(+50 to +150, for example) indicates that the manufac-
compatibility, and the MAX6639F is optimized for n =
1.021 for Penryn compatibiliy. If a sense transistor with
a different ideality factor is used, the output data is dif-
ferent. Fortunately, the difference is predictable.
Assume a remote-diode sensor designed for a nominal
ideality factor n NOMINAL is used to measure the tem-
perature of a diode with a different ideality factor, n 1 .
The measured temperature T M can be corrected using:
n 1
? n NOMINAL ?
where temperature is measured in Kelvin.
As mentioned above, the nominal ideality factor of the
MAX6639 is 1.008. As an example, assume the
MAX6639 is configured with a CPU that has an ideality
factor of 1.002. If the diode has no series resistance,
the measured data is related to the real temperature
as follows:
? n ? ? 1 . 008 ?
? n 1 ? ? 1 . 002 ?
For a real temperature of +85°C (358.15K), the mea-
sured temperature is +82.91°C (356.02K), which is an
error of -2.13°C.
Table 12. Remote-Sensor Transistor
Manufacturers
turer has good process control and that the devices
have consistent characteristics.
Effect of Ideality Factor
The accuracy of the remote temperature measurements
depends on the ideality factor (n) of the remote diode
(actually a transistor). The MAX6639 is optimized for n
= 1.008, for Intel ? Pentium ? II and AMD Athlon ? MP
Intel and Pentium are registered trademarks of Intel Corp.
AMD Athlon is a registered trademark of Advanced Micro
Devices, Inc.
18
MANUFACTURER
Central Semiconductor (USA)
Rohm Semiconductor (USA)
Samsung (Korea)
Siemens (Germany)
MODEL NO.
CMPT3906
SST3906
KST3906-TF
SMBT3906
Maxim Integrated
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| MAX6639EVKIT+ | 功能描述:马达/运动/点火控制器和驱动器 MAX6639/39F Eval Kit 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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| MAX6639FAEE+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 |
| 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 |
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