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  • 3B01: the connection between the 26-pin and 16 channel.
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  • datasheet 2B35
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  • +MAX16141_AAF/V+_A1: FAQ
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  • +MAX31785AETL+T: FAQ
  • MAX31790: FAQ
  • -MAX31790ATI+T: FAQ
    • Can I leave the FULL_SPEED pin on the MAX31790 floating?
    • How can I decrease oscillations when I operate the MAX31790 fan controller in RPM mode?
    • How to avoid Fan_Fail to trigger for unused ports in the MAX31790?
    • How to calculate the rpm value from tach count with max 31790 board?
    • In the MAX31790 design, how to prevent fan oscillations in RPM mode?
    • Is there a connection error in figure 6 of MAX31790 datasheet ?
    • MAX31790 I2C timeout
    • MAX31790- Cannot change PWM duty cycle (Fans at full speed)
    • The delay time to get RPM response after set TACH input bit for MAX31790?
    • The voltage level of MAX31790 interface
    • What are the Theta Jc and Theta Ja of MAX31790?
    • What is the MAX31790 I2C (SDA/SCL) specification?
    • When reading from the TACH count registers in the MAX31790, is it possible to read from two different counts if two 1-byte read commands are used?
    • Will the MAX31790 work if we are using standard mode and SDA/SCL clock rising time is 500ns or it is compatible only for I2C fast mode?
    • 用控制器和MAX31790通讯进行测试,当设置了Target PWM Duty Cycle 寄存器后,在PWM输出端测量不到输出。
  • +MAX31856MUD+: FAQ
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  • +MAX9880AEVKIT#: FAQ
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  • MAXQ7667: FAQ
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  • +MAXREFDES101 SOFTWARE FOR WINDOWS 10: FAQ
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  • What does the "C01" denote in DS75S-C01+?
  • What should I do with unused I/O pins on the DS2482S?
  • +ZLP32300: FAQ
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用控制器和MAX31790通讯进行测试,当设置了Target PWM Duty Cycle 寄存器后,在PWM输出端测量不到输出。

造成目前问题的原因可能是:

1.通讯问题造成写寄存器失败,可以上电后读取寄存器的默认值来验证读取操作正确,然后再对寄存器进行配置,然后读取配置结果验证写入正确,确保通讯正确。


2. 配置问题:PWM输出可以配置为TACH输入,如果将PWM输出设置为了TACH输入,将不会有PWM输出信号。


3. PWM 输出是开路输出,需要配置外部上拉电阻,请确认在PWM输出引脚上带有上拉电阻。

4.电路问题:请确认电压和其他控制线连接可靠。

5. 在设置target PWM寄存器时需要将MAX31790配置为Direct控制模式。

 

Tags: KA-06632 MAX31790ATI+
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