Component: PWM 16CH 12Bit (PCA9685) (General Output)
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Jump to navigationJump to search| Author | Matrix TSL |
| Version | 1.0 |
| Category | General Output |
Contents
PWM 16CH 12Bit (PCA9685) component
The PCA9685 is an I²C-bus controlled 16-channel LED controller optimized for Red/Green/Blue/Amber (RGBA) color backlighting or Servo motor applications. Each output has its own 12-bit resolution (4096 steps) fixed frequency individual PWM controller that operates at a programmable frequency from a typical of 24 Hz to 1526 Hz. All outputs are set to the same PWM frequency. Up to 64 devices can be chained together on a single I²C-bus to provide up to 1024 individual PWM outputs.
Component Source Code
Please click here to download the component source project: FC_Comp_Source_PCA9685_16_Channel_PWM.fcfx
Please click here to view the component source code (Beta): FC_Comp_Source_PCA9685_16_Channel_PWM.fcfx
Detailed description
No detailed description exists yet for this component
Examples
No additional examples
Macro reference
GetClockFrequency
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GetClockFrequency |
| Returns the current clock frequency | |
 - ULONG
|
Return |
Initialise
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Initialise |
| Sets up the I2C ready for communications to begin | |
 - VOID
|
Return |
Reset
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Reset |
| Sends a reset command to the PCA9685 chip over I2C | |
| - VOID
|
Return |
SetAddress
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SetAddress |
| Allows a different I2C address to be specified allowing one component to control multiple PCA9685 modules. | |
 - BYTE
|
Address |
| Range: 0x40 - 0x7F | |
| - VOID
|
Return |
SetClockFrequency
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SetClockFrequency |
| Sets the current clock frequency, used for things like calculating the PWM frequency and Microsecond duty. | |
| - ULONG
|
Clock |
| - VOID
|
Return |
SetExternalClock
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SetExternalClock |
| Sets EXTCLK pin to use the external clock | |
| - BYTE
|
Prescale |
| External Clock Prescaler - Range: 3-255 | |
| - VOID
|
Return |
SetOutputMode
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SetOutputMode |
| Sets the output mode of the PCA9685 to either open drain or push pull. Warning: LEDs with integrated zener diodes should only be driven in open drain mode. | |
 - BOOL
|
Mode |
| 0=OpenDrain, 1=Push/Pull | |
| - VOID
|
Return |
SetPWM
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SetPWM |
| Sets the PWM output of one of the PCA9685 pins | |
| - BYTE
|
Output |
| One of the PWM output pins - Range: 0 to 15 | |
 - UINT
|
On |
| At what point in the 4096-part cycle to turn the PWM output ON | |
| - UINT
|
Off |
| At what point in the 4096-part cycle to turn the PWM output OFF | |
| - VOID
|
Return |
SetPWMFrequency
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SetPWMFrequency |
| Sets the PWM frequency for the entire chip, up to approx 1.6 KHz | |
 - FLOAT
|
Frequency |
| Floating point frequency that we will attempt to match | |
| - VOID
|
Return |
SetPin
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|
SetPin |
| Sets pin without having to deal with on/off tick placement and properly handles a zero value as completely off and 4095 as completely on. | |
| - BYTE
|
Output |
| One of the PWM output pins - Range: 0 to 15 | |
| - UINT
|
Duty |
| The number of ticks out of 4096 to be active | |
| - BOOL
|
Invert |
| 0=Normal, 1=Inverted | |
| - VOID
|
Return |
Sleep
|
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Sleep |
| Puts the module into Sleep mode | |
| - VOID
|
Return |
WakeUp
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|
WakeUp |
| Wakes the module from Sleep mode | |
| - VOID
|
Return |
WriteMicroseconds
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|
WriteMicroseconds |
| Sets the PWM output of one of the PCA9685 pins based on the input microseconds, output is not precise | |
| - BYTE
|
Output |
| One of the PWM output pins - Range: 0 to 15 | |
| - UINT
|
Microseconds |
| The number of Microseconds to turn the PWM output ON | |
| - VOID
|
Return |
Property reference
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Properties |
|
Address |
| Module I2C Address. This setting can be overridden using the SetAddress component macro. | |
|
|
Output Mode |
| Sets the output mode of the PCA9685 to either open drain or push pull. Warning: LEDs with integrated zener diodes should only be driven in open drain mode. Can be overridden using the SetOutputMode component macro. | |
|
|
Clock Type |
| Configures the input clock source to the module. | |
|
Clock Frequency |
| Frequency of the module. Internal oscillator defaults to 250000000 or 25MHz but can actually be anywhere from 23 to 27MHz. External clock frequency can be specified here up to a max value of 50000000 or 50MHz. This setting can be overridden using the SetClockFrequency component macro. | |
|
|
Prescaler |
| External Clock Prescaler Range: 3 to 255 | |
|
Target PWM Frequency |
| The ideal PWM frequency we would like to generate on the output pins. Servo motors require an output frequency around 50Hz. LEDs require a mugh higher output frequency to avoid visible flicker. | |
|
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Actual PWM Frequency |
| The calculated actual PWM frequency available using the Clock Frequency and Prescaler | |
|
|
PWM Resolution |
| Number of microseconds the PWM output can resolve to | |
|
I2C Communications |
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Channel |
| Channel selection | |
|
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Baud Select |
| Baud rate option selector | |
|
Baud Rate |
| Baud rate to be used | |
|
SDA |
| Pin used for SDA (data signal) | |
|
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SCL |
| Pin used for SCL (clock signal) | |
|
Stop Delay |
| On older microcontroller devices there is a potential for the I2C hardware channel to lock up if there is not a 10ms delay between an I2C stop event and the next I2C start event. Most modern microcontrollers will not have a problem so this property can be disabled to speed up the I2C communications. | |
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Simulation |
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Simulate Comms |
