LP5523 datasheet(41/61 Pages) TI2

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LP5523

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SNVS550E – SEPTEMBER 2009 – REVISED JANUARY 2017

Product Folder Links: LP5523

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(1)

This opcode is used with numerical operands.

(2)

This opcode is used with variables.

(3)

X means do not care.

Table 6. LP5523 Branch Instructions

Inst.

Bit

[15]

Bit

[14]

Bit

[13]

Bit

[12]

Bit

[11]

Bit

[10]

Bit

[9]

Bit [8]

Bit

[7]

Bit [6]

Bit [5]

Bit

[4]

Bit [3] Bit [2]

Bit [1] Bit [0]

rst

branch(1)

loop count

step number

branch(2)

step number

loop count

int

end

int

reset

trigger

wait for trigger

send a trigger

ext.

trig

X(3)

ext.

trig

X(3)

jne

Number of instructions to be skipped

if the operation returns true

variable

Number of instructions to be skipped

if the operation returns true

variable

jge

Number of instructions to be skipped

if the operation returns true

variable

Number of instructions to be skipped

if the operation returns true

variable

(1)

This opcode is used with numerical operands.

(2)

This opcode is used with variables.

Table 7. LP5523 Data Transfer And Arithmetic Instructions

Inst.

Bit

[15]

Bit

[14]

Bit

[13]

Bit

[12]

Bit

[11]

Bit

[10]

Bit [9] Bit [8] Bit [7] Bit [6]

Bit

[5]

Bit

[4]

Bit [3]

Bit [2]

Bit

[1]

Bit [0]

target variable

8-bit value

add(1)

target variable

8-bit value

add(2)

target variable

variable

sub(1)

target variable

8-bit value

sub(2)

target variable

variable

7.6.4 LED Driver Instructions

7.6.4.1 Ramp

This is the instruction useful for smoothly changing from one PWM value into another PWM value on the D1 to

D9 outputs; in other words, generating ramps (with a negative or positive slope). The LP5523 allows

programming very fast and very slow ramps.

Ramp instruction generates a PWM ramp, using the effective PWM value as a starting value. At each ramp step

the output is incremented/decremented by one unit, unless the number of increments is 0. Time span for one

ramp step is defined with prescale bit [14] and step time bits [13:9]. Prescale = 0 sets 0.49 ms cycle time and

prescale = 1 sets 15.6 ms cycle time; so the minimum time span for one step is 0.49 ms (prescale × step time

span = 0.49 ms × 1) and the maximum time span is 15.6 ms × 31 = 484 ms/step.

Number of increments value defines how many steps are taken during one ramp instruction; increment maximum

value is 255d, which corresponds increment from zero value to the maximum value. If PWM reaches

minimum/maximum value (0/255) during the ramp instruction, ramp instruction is executed to the end regardless

of saturation. This enables ramp instruction to be used as a combined ramp and wait instruction. Note: Ramp

instruction is wait instruction when the increment bits [7:0] are set to zero.

LP5523 Datasheet(PDF) 41 Page - Texas Instruments

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