LP55231 datasheet(45/53 Pages) TI

45 / 53 page

LP55231

www.ti.com

SNOSCR5 – MARCH 2013

Name

Value (d)

Description

0 = variable A

target variable

0 - 2

1 = variable B

2 = variable C

0 = local variable A

1 = local variable B

variable 1 (ii)

0 - 3

2 = global variable C

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

0 = local variable A

1 = local variable B

variable 2 (ii)

0 - 3

2 = global variable C

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

SUB

SUB Operator either subtracts 8-bit value from the current value of the target variable, or subtracts the value of

the variable 2 (A, B, C or D) from the value of the variable 1 (A, B, C or D) and stores the result in the register of

target variable (A, B or C). Variables overflow from 0 to 255.

Name

Value (d)

Description

8-bit value (i)

0 - 255

The value to be added.

0 = variable A

target variable

0 - 2

1 = variable B

2 = variable C

0 = local variable A

1 = local variable B

variable 1 (ii)

0 - 3

2 = global variable C

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

0 = local variable A

1 = local variable B

variable 2 (ii)

0 - 3

2 = global variable C

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

Automatic Power-Save Mode

Automatic power-save mode is enabled when POWERSAVE_EN bit in register address 36H is “1". Almost all

analog blocks are powered down in power-save if an external clock signal is used. Only the charge-pump

protection circuits remain active. However, if the internal clock has been selected, only charge pump and LED

drivers are disabled during the power save; the digital part of the LED controller needs to stay active. In both

cases the charge pump enters the weak 1x mode. In this mode the charge pump utilizes a passive current

limited keep-alive switch, which keeps the output voltage at the battery level. During the program execution

LP55231 can enter power save if there is no PWM activity in any of the LED driver outputs. To prevent short

power-save sequences during program execution, LP55231 has an instruction look-ahead filter. During program

execution engine 1, engine 2 and engine 3 instructions are constantly analyzed, and if there are time intervals of

more than 50 ms in length with no PWM activity on LED driver outputs, the device will enter power save. In

power-save mode program execution continues uninterrupted. When an instruction that requires PWM activity is

executed, a fast internal-startup sequence will be started automatically.

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