AS3689 datasheet(37/72 Pages) AMSOSRAM

37 / 72 page

AS3689

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (mlg, ptr)

Revision 1.0.2 / 20070115

35 - 70

Addr: 2Dh

Curr51 current

This register controls the curr51 current sink current.

Bit

Bit Name

Default

Access

Description

7:0

curr51_current

R/W

Defines current into Current sink CURR51

00h = 0 mA

01h = 0.15 mA

...

FFh = 38.25 mA

Addr: 2Eh

Curr52 current

This register controls the curr52 current sink current.

Bit

Bit Name

Default

Access

Description

7:0

curr52_current

R/W

Defines current into Current sink CURR52

00h = 0 mA

01h = 0.15 mA

...

FFh = 38.25 mA

7.4.5 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 or 4th second.

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 (see register cp_auto_on in the charge pump section) to reduce the overall

current consumption.

Figure 17 – LED Pattern Generator AS3689 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

descirption 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 e.g.

to RGB1/RGB2/RGB3 as follows:

any current sink

1 2 3 4 5 6 7 8 9 ... 32

1 2 3 4 5 6

At this time a delay of 0s,1s(8s),2s(16s) or 3s(24s)

can be programmed

7 8 9 ...

Defined by bit in the setup register pattern_data

in this example the code is 101110011...

31.25ms

(250ms if pattern_slow=1)

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