hello,
we are developing a new glow plug controller using the L9524C IC and we have some problem with the control frequency generating by the ECU,we can't test our product, we need to generate the right PWM signal like the one from the ECU.
we are alredy generate a PWM signal with the arduino uno but we can't find the right frequency and duty cycle.
so please if anybody have experience with this signals share ideas with us please.
thank you
UnesBn:
hello,
we are developing a new glow plug controller using the L9524C IC and we have some problem with the control frequency generating by the ECU,we can't test our product, we need to generate the right PWM signal like the one from the ECU.
we are alredy generate a PWM signal with the arduino uno but we can't find the right frequency and duty cycle.
so please if anybody have experience with this signals share ideas with us please.
thank you
You can't find the right frequency??? Where have you looked? Is this for an automobile engine for for a model airplane motor's glow plug?
IF for an automobile, get another working model and test it.
Paul
How I'd read it:
Looking at the datasheet for that part:
https://www.st.com/resource/en/datasheet/l9524c.pdf
- Fig. 4, pg. 14. The period of the PWM on pin CI is called out as Tci
- Table 5, pg. 11/27, item 16.1. For the quoted accuracy, Tci is given as "30ms <= TCI <= 33ms"
- same item, Tcion/Tci >= 20%
A "nominal" 31.5mS (half-way between 30 & 33mS) period gives a PWM frequency of 31.7Hz with a minimum duty cycle of 20%