ST7FLite39 used in ballast for HID lamps_IgnitionCheck Problem

mighel84 · ‎2010-04-16

Posted on April 16, 2010 at 11:21

Hi all,

I read your firmware code in ST site to spark an HID 250 Watt Lamp.

I found out that you sense an unused pin ANALOG1 as Vsens during IgnitionStart and IgnitionCheck routine... those routines are from line 153 to 213 in ''main.c'' of [steval-ilh001v1_sw_hid_ballast_fw_libraries_v1_0_0].

In IgnitionCheck you check if ''Vsens >= 140'' then go to BurnLampPhase (from line185 to 189).

But Vsens is a dummy! That doesn't seems to be a real control... what do you have done? Will I need to change Vsens with Vlamp?!?

What I think is: if an HID lamp voltage during ignition must be 3000 volt, in IgnitionCheck routine I must control it. So the control must be: (if Vlamp>=140) and not (if Vsens>=140).

PS I'm sorry but I can't use your EvalBoard... I want to use your Chips but I need absolutely SPI interface pins. You use those for other purposes in EvalBoard :(

Thanks.

mighel84 · ‎2010-04-16

Posted on April 16, 2010 at 12:41

Look in Application Note AN2747 at page 41

In the flowchart during the ''IgnitionPhase'' the logic control is ''Vlamp>=100 volt''.

What do you think? I must change your firmware code?

Thanks.