13892 datasheet(116/161 Pages) FREESCALE

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Analog Integrated Circuit Device Data

116

Freescale Semiconductor

13892

FUNCTIONAL DEVICE OPERATION

LIGHTING SYSTEM

Figure 34. Serial LED Configurations

In the left most example in Figure 34: LEDMD set at 15 mA (low range), LEDKP set at 30 mA (high range). When both are

operated then the LEDMD current will pulse at 30 mA and the LEDKP current at 60 mA. This provides an average of 15 mA

through the main display backlight LEDs and 30 mA through the keypad backlights LEDs.

SIGNALING LED DRIVERS

The signaling LED drivers LEDR, LEDG, and independent current sink channels. Each driver channel features programmable

current levels via LEDx[2:0] as well as programmable PWM duty cycle settings with LEDxDC[5:0]. By a combination of both, the

LED intensity can be adjusted. By driving LEDs of different colors, color mixing can be achieved.

Blue LEDs or bright green LEDs require more headroom than red and normal green signal LEDs. In the application, a 5.0 V

or equivalent supply rail is therefore required. This is provided by the integrated boost converter SWBST. To make software

programming easier, an LEDSWBSTEN SPI bit has been provided in the Blue LED register to enable the boost converter. Note

Table 107. Signaling LED Drivers Current Programming

LEDx[2:0](81)

LEDx Current Level (mA)

000

001

010

011

100

101

110

111

Notes

81.

“x” represents for R, G and B

Table 108. Signaling LED Drivers Duty Cycle Programming

LEDxDC[5:0](82)

Duty Cycle

000000

0/32, Off

000001

1/32

…

010000

16/32

…

011111

31/32

1xxxxx

32/32, Continuously On

Notes

82.

“x” represents R, G and B

LEDKP

LEDMD

12 LED Keypad Arrangement

2 LED Reduced Keypad Option

LEDAD

6 LED Main Display

LEDKP

LEDMD

External

Boost

9 LED Keypad

6 LED Main Display

LEDAD

6 LED Main Display

3 LED Aux Display

LEDMD

External

Boost

External

Boost

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