LP5569ARTWR datasheet(14/93 Pages) TI2

14 / 93 page

0,0

64,0

128,0

192,0

256,0

DIMMING CONTROL (DEC)

100,0

80,0

60,0

40,0

20,0

0,0

128

192

256

100

LP5569

SNVSAP8A – JULY 2017 – REVISED SEPTEMBER 2017

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Product Folder Links: LP5569

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Feature Description (continued)

Figure 14. 8-Bit User PWM Control, Exponential and Linear Dimming

8.3.1.2 Controlling the Low-Side Current Sinks

8.3.1.2.1

Direct Register Control

All LP5569 LED drivers, LED0 to LED8, can be controlled independently through the two-wire serial I2C-

compatible interface. For each low-side driver there is an 8-bit PWM control register which can be used to control

the LED PWM duty-cycle value. This register cannot be written when the program execution engine is active,

which could result in undesirable behavior. Care should be taken to update these registers only when the

program execution engine is idle.

8.3.1.2.2

Controlling by Program Execution Engines

Engine control is used when the user wants to create programmed sequences. The program execution engine

updates the direct-control registers when active. Therefore, if the user has set the PWM register to a certain

value, it is automatically overridden when the program execution engine controls the driver. LED control and

program-execution-engine operation is described in Programming.

8.3.1.2.3

Master Fader Control

In addition to LED-by-LED PWM register control, the LP5569 device is equipped with a master-fader control,

which allows the user to fade in or fade out multiple LEDs from the EN/PWM pin or by writing to the master fader

registers. This is a useful function to minimize serial bus traffic between the MCU and the LP5569 device. The

LP5569 device has three master fader registers, so it is possible to form three master fader groups. Either writing

master fader registers through the I2C interface directly or through LED engine control can set the master fader

cycle value of the master fader register.

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