1. Description:

PWM output, you can set the frequency, duty cycle;

Frequency is divided into four ranges, automatic switching:

1. XXX (no decimal point): the smallest unit is 1Hz, the value range of 1Hz ~ 999Hz;

2. X.XX (decimal point in the hundred) the smallest unit is 0.01Khz, the range of 1.00Khz ~ 9.99Khz;

3. XX.X (decimal point in ten): the smallest unit is 0.1Khz; value range of 10.0KHz ~ 99.9KHz

4. X.X.X (decimal point in ten and hundred): the smallest unit is 1Khz; value range 1KHz ~ 150KHz

5. e.g. frequency display:

   100 indicates PWM output 100Hz pulse; 1.01 indicates PWM output 1.01K pulse; 54.1 indicates that the PWM output has a pulse of 54.1 kHz; 1.2.4 indicates that the PWM output is 124 kHz pulse;

6. Duty cycle range: 0 ~ 100%;

7. All set parameters, power-down automatically saved.

2. Feature:

1. LCD display frequency and duty cycle, very clear, PWM output can be set to the frequency and duty cycle;

2. Wide frequency range, high precision;

3. Serial communication, TTL level

3. Parameter Settings:

The module has four independent keys, used to set the frequency and duty cycle, support touch (increase or decrease a unit) and long press (fast increase or decrease), set the parameters automatically save, power down Not lost.

4. Parameters:

• Working voltage: 3.3 ~ 30V;
• Frequency range: 1Hz ~ 150KHz;
• Frequency accuracy: the accuracy in each range is about 2%;
• Signal load capacity: the output current can be about 5 ~ 30ma;
• Output amplitude: PWM amplitude equal to the supply voltage;
• Ambient temperature: -20 ~ +70 ℃.

5. Application:

1. Used as a square wave signal generator, generate square wave signal for experimental development and use;

2. Used to generate a square wave signal that controls the motor driver;

3. generate adjustable pulse for MCU use;
4. generate adjustable pulse, control the relevant circuit (PWM dimming speed and other applications).
5. serial control (single-chip TTL level communication)

6. Communication Standard:

• 9600 bps Data bits: 8
• Stop bit: 1
• Check digit: none

• Flow control: none

  1. set the frequency of the PWM

  • "F101": Set the frequency to 101 HZ (001 to 999)
  • "F1.05": set the frequency of 1.05 KHZ (1.00 ~ 9.99)
  • "F10.5": Set the frequency to 10.5KHZ (10.0 ~ 99.9)
  • "F1.0.5": set the frequency of 105KHZ (1.0.0 ~ 1.5.0)

2. set the PWM duty cycle

 - "DXXX": set the PWM duty cycle to XXX; (001 ~ 100)
 - Such as D050, set the PWM duty cycle is 50%

3. read the set parameters

 - Send a "read" string to read the set parameters.
 - Set successfully return: DOWN;
 - Setup failed to return: FALL.

7. Pin Definition: