LP5523 datasheet(43/61 Pages) TI2

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DIMMING

CONTROL

STEP COUNT

STEP TIME

SPAN =

187.5ms

TIME ELAPSED (ms)

375

750

1125

1500

140

141

142

143

144

145

146

147

148

RAMP INSTRUCTION

LP5523

www.ti.com

SNVS550E – SEPTEMBER 2009 – REVISED JANUARY 2017

Product Folder Links: LP5523

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(1)

Valid for numerical operands.

(2)

Valid for variables.

Figure 25. Example of Ramp Instruction

7.6.4.3 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 (i)(1)

0 - 255

PWM output duty cycle 0 - 100%

variable (ii)(2)

0 - 3

0 = local variable A

1 = local variable B

2 = global variable C

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

7.6.4.4 Wait

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

frozen.

NAME

VALUE (d)

DESCRIPTION

prescale

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

Divide master clock (32 768 Hz) 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.

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