LP5523 datasheet(40/56 Pages) TI1

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LP5523

SNVS550D – SEPTEMBER 2009 – REVISED MAY 2013

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Set_PWM

This instruction is used for setting the PWM value on the outputs D1 to D9 without any ramps. Set PWM output

value from 0 to 255 with PWM value bits [7:0]. Instruction execution takes sixteen 32 kHz clock cycles (=488 µs).

Name

Value (d)

Description

PWM value(1)

0 - 255

PWM output duty cycle 0 - 100%

0 = local variable A

1 = local variable B

variable (2)

0 - 3

2 = global variable C

3 = register address 3CH variable D value, or register address 42H value.

(1)

Valid for numerical operands.

(2)

Valid for variables.

Wait

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

frozen.

Name

Value (d)

Description

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

prescale

Divide master clock (32 768 Hz) by 512 which means 15.625 ms cycle time.

time

1 - 31

Total wait time will be = (time) x (prescale). Maximum 484 ms, minimum 0.488 ms.

LED Mapping Instructions

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

stored in the SRAM (program memory of the LP5523). LP5523 has three program execution engines which can

be mapped to 9 LED drivers or to one GPO pin. One engine can control one or multiple LED drivers. There are

totally eleven instructions for the engine-to-LED-driver control: mux_ld_start, mux_map_start, mux_ld_end,

mux_sel,

mux_clr,

mux_map_next,

mux_map_prev,

mux_ld_next,

mux_ld_prev,

mux_ld_addr

and

mux_map_addr.

MUX_LD_START; MUX_LD_END

Mux_ld_start and mux_ld_end define the mapping table location in the memory.

Name

Value (d)

Description

SRAM address

0-95

Mapping table start/end address

MUX_MAP_START

Mux_map_start defines the mapping table start address in the memory, and the first row of the table will be

activated (mapped) at the same time.

Name

Value (d)

Description

SRAM address

0-95

Mapping table start address

MUX_SEL

With mux_sel instruction one, and only one, LED driver (or the GPO-pin) can be connected to a program

execution engine. Connecting multiple LEDs to one engine is done with the mapping table. After the mapping

has been released from an LED, PWM register value will still control the LED brightness. If the mapping is

released from the GPO pin, serial bus control takes over the GPO state.

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