AS3689 datasheet(33/72 Pages) AMSOSRAM

33 / 72 page

AS3689

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (mlg, ptr)

Revision 1.0.2 / 20070115

31 - 70

Table 13 – RGB pins Function Overview

Bit settings

Pin Function / Name

rgb1_

mode

rgb2_

mode

rgb3_

mode

cp_ext

_on

ldo_on

RGB1

RGB2

RGB3

Function

00b

open

all functions off

01b

RGB1

RGB2

RGB3

Normal current sink operation

10b

RGB1

RGB2

RGB3

PWM current sink operation

xxb

CP_CLK1 CP_CLK2

CP_FB

External chargepump operation

xxb

open or

RGB1

open or

RGB2

LDO

current sink operation on RGB1 and

RGB2, LDO on RGB3 pin

These low voltage current sinks have a resolution of 8 bits. They can be controlled individually by the LED

pattern generator (on/off).

External PWM control of these current sinks is also possible and can be enabled by software (Input pin GPIO).

If the current sink RGB3 (VANA) is not used, its alternative function is ldo.

Table 14 – RGB Sinks Characteristics

Symbol

Parameter

Min

Typ

Max

Unit

Note

IBIT7

Current sink if Bit7 = 1

19.2

IBIT6

Current sink if Bit6 = 1

9.6

IBIT5

Current sink if Bit5 = 1

4.8

IBIT4

Current sink if Bit4 = 1

2.4

IBIT3

Current sink if Bit3 = 1

1.2

IBIT2

Current sink if Bit2 = 1

0.6

IBIT1

Current sink if Bit1 = 1

0.3

IBIT0

Current sink if Bit0 = 1

0.15

For V(CURRx) > 0.2V

∆m

matching Accuracy

-10

+10

CURR1,CURR2

∆

absolute Accuracy

-15

+15

Curr1 –

Curr2

Voltage compliance

0.2

VBAT

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