LP5569 datasheet(26/93 Pages) TI2

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LP5569

SNVSAP8A – JULY 2017 – REVISED SEPTEMBER 2017

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8.5.2.2 Variables

The LP5569 device has four LED engine variables which are divided into local and global variables. Variables A

and B are engine-specific local variables and each of the three engines has separate A and B variables, so there

is a total of six A and B variables. Variable A can be read and written via I2C registers 42h–44h. Local variable B

is not available via I2C and can only be accessed by the LED engine. Variables C and D are global variables

which are shared by all three LED engines. Global variable C is not available via I2C and can only be accessed

by the LED engines. The D variable can be read and written via I2C register 3Eh. Variables are referenced to

instructions with 2 bits, see Table 3 for details. Note that some instructions (ld, add, sub) can use only variables

A, B, and C as target variables.

Table 3. LED Engine Variables

VARIABLE

BITS

LOCAL/GLOBAL

Local

Global

(1)

This opcode is used with numerical operands.

(2)

This opcode is used with variables.

8.5.2.3 Instruction Set

The LP5569 device has three independent programmable execution engines. All the program execution engines

have their own program memory block allocated by the user. The maximum program size for any one engine is

limited to 128 locations. At least one engine must be in the load-program mode with the engine-busy bit cleared

before writing to any program memory address. Program execution is clocked with a 32.768-kHz clock.

Instruction execution takes sixteen clock cycles (488 μs). This applies also to ramp and wait instructions where

execution time is a multiple of 488 μs. This clock can be generated internally or an external clock can be supplied

to the CLK pin. Using an external clock enables synchronization of LED timing to the external clock signal and is

also more power-efficient. The supported instruction set is listed in Table 4 through Table 6. The LP5569 device

is fully compatible with the LP5523 instruction set. A command compiler is available for easy sequence

programming. With the command compiler it is possible to write sequences with simple ASCII commands, which

are then converted to binary or hex format.

Table 4. LED Driver Instructions

INSTRUCTION

USAGE

COMPILER EXAMPLE

ramp(1)

Generate a programmable PWM ramp to mapped LED driver(s) from

the current value to a new value in steps of +1 or –1 with programmed

step time.

ramp 0.6, 255; ramp to full scale in 0.6 s

ramp(2)

ramp var1, prescale, var2 var1 is a variable (ra, rb, rc, rd); prescale is a

boolean constant (pre = 0 or pre = 1); Var2 is a variable (ra, rb, rc, rd).

Output PWM with increasing or decreasing duty cycle.

ld ra, 31 ld rb, 255 ramp ra, pre=0, +rb; ramp

up to full scale over 3.9 s.

set_pwm(1)

Set PWM or current value to mapped LED driver(s), effective

immediately.

set_pwm 128; set duty cycle to 50%.

set_pwm(2)

set_pwm var1 Var1 is a variable (ra, rb, rc, rd). Generate a continuous

PWM output.

ld rc, 128; set_pwm rc; set PWM duty cycle

to 50%.

wait

Wait for a given time. Time span is from 0.488 ms to 484 ms.

wait 0.4; wait for 0.4 s; wait for 0.4 s

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