PSIG wrote: ↑Wed Nov 08, 2023 3:10 pm
Julien Hilaire wrote: ↑Wed Nov 08, 2023 11:31 amMy question is for IGN because I mesure 0,80v (500rpm) to 2,60v ( 7500rpm) on all IGN channels with voltmeter.Many typical voltmeters cannot read quick enough to display voltage accurately. For testing function in an ECM, an oscilloscope (even a cheap one) is virtually required. If you have an extra Arduino, there are some online projects for fast-read voltmeter circuits that may work in a pinch?
Vdrive = 5 V and TC4424's have 4,94v on pin6.
"Smart" coils and coil drivers rated 5-volts should work properly with the standard output of the TC4424 at 5V. Some drivers use more current than others (at 5V), and output resistor values may need calculation. Search if yours is one of those. From what I've seen, original A/Q/R/S "red" coils (06E905115x or 958 602 102 00) work fine at 5V. Some fakes or clones can be different.
thx for answer
I've measured IGN's signals with an oscilloscope and you're totally in truth
4,97V square wave form signal during 70rpm to 8000rpm.
Of course, I'll use "Red" R8 COP from NGK for sure : cost effective and good quality products.
I've an other question :
my RPM is going crazzy near 5200rpm to 6300rpm. Before 5200 and after 6300rpm ; rpm are stables (+/-30rpm).
Measuring the signal after treatement with max9926 circuit, with oscilloscope on Teensy35 (pin23 in my pinMapping), I read a "nice" 5.04V square wave form signal
in accordance with rpm not in TS as explain before.
Do you think that the VDDA (5v) pull-up on COUT1/2 is not "tolerate" by Teensy35 ?
DIY to learn and teach.