AS3675 datasheet(37/81 Pages) AMSCO

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AS3675

Datasheet - D e ta i l e d D e s c r i p t i o n

8.4.5

LED Pattern Generator

The LED pattern generator is capable of producing a pattern with 32 bits length and 1 second duration (31.25ms for

each bit). The pattern itself can be started every second, every 2

nd, 3rd up to 7th second1.

With this pattern all current sinks can be controlled. The pattern itself switches the configured current sources between

0 and their programmed current.

If everything else is switched off, the current consumption in this mode is IACTIVE. (excluding current through switched

on current source) and the charge pump, if required. The charge pump can be automatically switched on/off depending

on the pattern (set register cp_auto_on on page 20=1) to reduce the overall current consumption.

Figure 16. LED Pattern Generator AS3675 for pattern_color = 0

To select the different current sinks to be controlled by the LED pattern generator, see the ‘xxxx’_mode registers

(where ‘xxxx’ stands for the to be controlled current sink, e.g. curr1_mode for CURR1 current sink). See also the

description of the different current sinks.

To allow the generator of a color patterns set the bit pattern_color to ‘1’. Then the pattern can be connected to CURRx

as follows:

Figure 17. LED Pattern Generator AS3675 for pattern_color = 1

Table 50. Curr43 current

Addr: 15h

Curr43 current

This register controls the curr43 current sink current.

Bit

Bit Name

Default Access

Description

7:0

curr43_current

0R/W

Defines current into Current sink CURR43

00h

0 mA

01h

0.15 mA

....

FFh

38.25 mA

1. All times can be extended by a factor of 8 by setting pattern_slow=1 (this result in a delay of up to 56s)

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