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AN4460 Datasheet(PDF) 22 Page - STMicroelectronics

Part # AN4460
Description  The STEVAL-ILL057V1 demonstration board is a complete
PDF  54 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4460 Datasheet(HTML) 22 Page - STMicroelectronics

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Firmware implementation
AN4460
22/54
DocID026129 Rev 1
Figure 7. Dimming channel relation
5.2
Firmware evolution
The following section describes the software timing characteristics as shown in Figure 8.
Figure 8 shows the relationship between two consecutive STMR_ISR() routines and the
other principal subroutines. The colors define if the routines run in interrupt mode (colored)
or are called from main (black). The PMW1_ON line is the dimming period: when the line is
high, the PWM signal is high too.
Figure 8. FW timeline evolution
The lines are here described:
STMR_ISR(): STMR timer interrupt.
The STMR timer has a granularity of 20 µs (STMR unit). The timer is used to start
and stop the dimming period for each SMED and triggers the SWx bit on the MSC
SMSWEV register. On every interrupt, the timer is reprogrammed so that the next
1/200 Hz = 5 mS
DIMM1
time
T8
T0
T2
T4
T6
T0
DIMM2
DIMM3
DIMM4
T2
T4
T6
T0
T2
1/200 Hz = 5 mS
AM16707v1
1/200 Hz = 5 mS
PWM _
1ON
time
T0
ADC_ISR()
Get_Key()
STMR_ISR()
Not in scale
Comp_PWM ()
SMEDx_ISR()
Comp_DUTY()
AWU time
AM16708v1



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