LP5569RTWRG4 datasheet(30/93 Pages) TI2

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LP5569

SNVSAP8A – JULY 2017 – REVISED SEPTEMBER 2017

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(1)

Valid for numerical operands

(2)

Valid for variables

8.5.2.4.3

Set_PWM

This instruction is used for setting the PWM value on outputs LED0 to LED8 without any ramps. Set the PWM

output value from 0 to 255 with PWM value bits [7:0]. Instruction execution takes 16 32-kHz clock cycles

(= 488 µs).

NAME

VALUE (d)

DESCRIPTION

PWM value(1)

0–255

PWM output duty cycle 0–100%

variable(2)

0–3

0 = local variable A

1 = local variable B

2 = global variable C

3 = global variable D

8.5.2.4.4

Wait

When a wait instruction is executed, the engine is set in wait status, and the PWM values on the outputs are

frozen. Note: A wait instruction with prescale and time = 0 is invalid and is executed as rst.

NAME

VALUE (d)

DESCRIPTION

prescale

Divide master clock (32.7 kHz) by 16 which means 0.488 ms cycle time.

Divide master clock (32.7 kHz) by 512 which means 15.625 ms cycle time.

time

1–31

Total wait time is = (time) × (prescale). Maximum 484 ms, minimum 0.488 ms.

8.5.2.5 LED Mapping Instructions

These instructions define the engine-to-LED mapping. The mapping information is stored in a table, which is

stored in the lower half of SRAM (program memory of the LP5569 device). The LP5569 device has three

program execution engines which can be mapped to nine LED drivers. One engine can control one or multiple

LED drivers. Execution engine 1 has priority over execution engines 2 and 3, with execution engine 2 having

priority over execution engine 3. If an LED is mapped to more than one execution engine, the higher-priority

engine controls the LED.

LED mapping instructions can be divided to two groups:

•

Instructions that activate LED mapping to a certain row of the table (map_ instructions).

•

Instructions that DO NOT activate the actual LED mapping but just shift the mapping-table pointer (load_

instructions).

Activating instructions are map_start, map_sel, map_clr, map_next, map_prev and map_addr. Instructions

load_start, load_end, load_next, load_prev and load_addr do not activate the LED mapping. Mapping table and

master fader bits can be read from I2C registers 70h–75h but are written only via engine instructions.

When an engine is actively mapped to the LEDs, the engine takes over the LED PWM control, and PWM control

registers have no effect. Register control is returned when the engine is mapped to another LED. See Figure 26

for a simplified diagram of LED-engine data flow. The engine does not push a new PWM value to the LED driver

output before the set_pwm or ramp instruction is executed. If the mapping has been released from an LED, the

value in the PWM register still controls the LED brightness, and the PWM register value remains in the last

engine state.

Actual PWM control resolution of the LED engines is 12 bits, but only the 8 highest bits are visible in the I2C

registers. Also, engine commands use the 8 high bits for control, and the 4 low bits are used for smoother ramps.

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