AS3668 datasheet(48/60 Pages) AMSCO

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AS3668

Data Sheet - A p p l i c a t i o n I n f o r m a t i o n

10 Application Information

10.1 LED Software Implementation Examples

10.1.1 Simple Breathlight Pattern with one LED

In this example we’d like to use CURR1 in pattern generation mode to create a simple breathlight pattern without continuous I2C traffic. This

helps to unload the calculation power from the CPU.

Figure 49. Simple Breathlight Pattern Example

The timing example shown in Figure 49 above, can be easily implemented with just a couple of I2C commands.

Table 45. Code Example Simple Breathlight Pattern

10.1.2 Dual Pulse Pattern with one LED

In this example we would like to use CURR1 in pattern generation mode to create a simple dual pulse pattern without continuous I2C traffic. This

helps again to unload the CPU.

Figure 50. Dual Pulse Pattern Example

The timing example shown in Figure 50 above, can be easily implemented with just a couple of I2C commands.

Address

Write Value

Comments

CurrX Control

0x01

0x03

Enable CURR1 for pattern generation mode. Other

current sources are off

CURR1 Current

0x02

0x96

Set the output current of CURR1 to 15mA.

PWM Timing

0x16

0x55

Define Rise/Fall time with 0,77s

Pattern Timing

0x18

0x32

Define 0,15s on time and 4,21s off time

Start Control

0x1B

0x02

Start breathlight pattern

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