MC13892VK Freescale Semiconductor, MC13892VK Datasheet - Page 114

• Manufacturer Part Number: MC13892VK
• Description: IC PMU I.MX51/37/35/27 139MAPBGA
• Manufacturer: Freescale Semiconductor

Specifications of MC13892VK

• Applications: Battery Management, Display (LED Drivers), Handheld/Mobile Devices, Power Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: *
• Output Current: 65 mA
• Output Voltage: 1.5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Voltage - Supply: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

FUNCTIONAL DEVICE OPERATION
LIGHTING SYSTEM
configured in series. Three additional drivers are provided for RGB or general purpose signaling.
BACKLIGHT DRIVERS
programmable current levels via LEDx[2:0] as well as programmable PWM duty cycle settings with LEDxDC[5:0]. By a
combination of level and PWM settings, the backlight intensity can be adjusted, or a soft start and dimming feature can be
implemented. The on period of the serial LED backlight drivers will be adapted to take into account that the serial LED switcher
startup time is longer than one half the minimum of the period of the backlight drivers.
to avoid flickering and or beat frequencies with the different types of displays. Also, to avoid high frequency spur coupling in the
application, the switching edges of the output drivers are softened.
current setting, in case two or more serial LED strings are connected in parallel to the same driver or when using super bright
LEDs.
to orchestrate dimming and soft start lighting effects. Ramp patterns for each of the drivers is accessed with the corresponding
LEDxRAMP bit.
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The lighting system includes backlight drivers for main display, auxiliary display, and keypad. The backlight LEDs are
The backlight drivers LEDMD, LEDAD and LEDKP are independent current sink channels. Each driver channel features
When applying a duty cycle of less than 100% the backlight drivers will be turned on and off at a repetition rate high enough
The current level is programmable in a low range mode and in a high range mode through the LEDxHI bit. This facilitates the
Ramp up and ramp down patterns are implemented in hardware to reduce the burden of real time software control via the SPI
Table 104. Backlight Drivers Current Programming
Table 105. Backlight Drivers Duty Cycle Programming
Notes
LEDx[2:0]
Notes
78.
79.
000
001
010
011
100
101
110
111
100000 to 111111
“x“ Represents MD, AD and KP
“x” represents MD, AD, or KP
LEDxDC[5:0]
(78)
000000
000001
010000
011111
…
…
LIGHTING SYSTEM
LEDxHI = 0
(79)
12
15
18
21
0
3
6
9
LEDx Current Level (mA)
32/32, Continuously On
Duty Cycle
0/32, Off
LEDxHI = 1
16/32
31/32
1/32
…
…
12
18
24
30
36
42
0
6
Analog Integrated Circuit Device Data
Freescale Semiconductor