AS3688 datasheet(38/72 Pages) AMSOSRAM

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AS3688

austriami crosyst ems

Datasheet, Confidential

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Revision 1.1.1 / 20060707

36 - 70

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 IBAT. (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

20 – LED Pattern Generator AS3688 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:

Figure

21 – LED Pattern Generator AS3688 for pattern_color = 1

Only those current sinks will be controlled, where the ‘xxxx’_mode register is configured for LED pattern.

If the register bit pattern_slow is set, all pattern times are increased by a factor of eigth. (bit duration: 250ms if

pattern_color=0 / 800ms if pattern_color=1, delays between pattern up to 24s).

7.4.5.1 Soft Dimming for Pattern

The internal pattern generator can be combined with the internal pwm dimming modulator to obtain as shown in

the following figure:

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)

RGB1/CURR1/CURR41/CURR30

RGB2/CURR2/CURR42/CURR31

RGB3/

/CURR43/CURR32,33

3 6 9

... 30

...

100ms

(800ms if pattern_slow=1)

... 29

... 28

1 4 7

2 5 8

3 6 9

1 4 7

2 5 8

...

Defined by bit in the setup register pattern_data

in this example the code is 111110001011111000110111...

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

can be programmed

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