TS-8820-pwm: Difference between revisions
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The TS-8820 has | The TS-8820 has 6 PWM outputs. PWM channels 1 to 6 feed digital outputs 1 to 6 respectively when the PWM override bit is set for a given output. | ||
For all 8 PWM channels, the PWM frequency is approximately (12207/(2^prescalar)) Hz, where the prescalar value is 3 bits wide. That is, a prescalar value of 0 through 7. The PWM duty cycle has 12 bits of resolution. If bit 12 of a PWM register is set, then the PWM output for that channel will be 100% high. Otherwise, the duty cycle setting is divided by 4096 to give the effective duty cycle. | For all 8 PWM channels, the PWM frequency is approximately (12207/(2^prescalar)) Hz, where the prescalar value is 3 bits wide. That is, a prescalar value of 0 through 7. The PWM duty cycle has 12 bits of resolution. If bit 12 of a PWM register is set, then the PWM output for that channel will be 100% high. Otherwise, the duty cycle setting is divided by 4096 to give the effective duty cycle. | ||
Revision as of 12:21, 17 January 2019
The TS-8820 has 6 PWM outputs. PWM channels 1 to 6 feed digital outputs 1 to 6 respectively when the PWM override bit is set for a given output.
For all 8 PWM channels, the PWM frequency is approximately (12207/(2^prescalar)) Hz, where the prescalar value is 3 bits wide. That is, a prescalar value of 0 through 7. The PWM duty cycle has 12 bits of resolution. If bit 12 of a PWM register is set, then the PWM output for that channel will be 100% high. Otherwise, the duty cycle setting is divided by 4096 to give the effective duty cycle.
To give OUT5 a ~3 kHZ 50% duty cycle PWM output using ts8820ctl, the following arguments would be used:
# --prescalar= sets the PWM frequency to (12207/(2^VALUE))Hz.
# --mvolts= sets the PWM duty cycle percentage from a decimal scale of 0-10000
# --pwm= PWM channel to enable and modify
ts8820ctl --pwm=5 --mvolts=5000 --prescalar=2