List of figures

AN2841

4/31

List of figures

Figure 1.

PWM signal with 16 steps of possible voltage values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 2.

PWM serial-parallel conversion for multiple LED applications . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 3.

Example of a specific lighting setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 4.

Simplified setup of an application using an STP24DP05 . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 5.

STM32 evaluation board setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 6.

STM32 evaluation board block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 7.

Computation of

LEDdriverDATAbuffer variable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 8.

Conversion of

LEDmap array to LEDdriverDATAbuffer . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 9.

Dynamic data preparation - time consumption - block diagram . . . . . . . . . . . . . . . . . . . . . 12

Figure 10.

Dynamic data preparation - time consumption - real signals . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 11.

Static lookup table time consumption with 166 kHz - 333 kHz LE signal . . . . . . . . . . . . . . 13

Figure 12.

Timing diagram: Single interrupt method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 13.

Real timing signals for single interrupt method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 14.

Timing diagram: Single interrupt with DMA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 15.

Timer interrupt + DMA transfer + DMA interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 16.

Real signals: timer interrupt + DMA transfer + DMA interrupt model . . . . . . . . . . . . . . . . . 18