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AS3689 Datasheet(PDF) 43 Page - ams-OSRAM AG

Part # AS3689
Description  Flexible Lighting Management
PDF  72 Pages
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Manufacturer  AMSOSRAM [ams-OSRAM AG]
Direct Link  https://ams-osram.com/
Logo AMSOSRAM - ams-OSRAM AG

AS3689 Datasheet(HTML) 43 Page - ams-OSRAM AG

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AS3689
austriami crosyst ems
Datasheet, Confidential
www.austriamicrosystems.com (mlg, ptr)
Revision 1.0.2 / 20070115
41 - 70
Figure 23 – Charge Pump for Generation of positive voltages
O-LED Charge
Pump
RGB2
3x
BAS40
AS3689
RGB1
RGB3
1.375MΩ
220pF
2.2µF
15V,
5mA
10µA
Pulse
Skip
VBAT
125kΩ
1.25V
7.4.7.1 External chargepump Registers
Addr: 00h
Reg. Control
This register enables/disables the LDOs, Charge Pumps, Charge Pump LEDs, current
sinks, the Step Up DC/DC Converter.
Bit
Bit Name
Default
Access
Description
4
cp_ext_on
0
R/W
Enable the external chargepump
0b = Disable the external chargepump.
1b = Enable the external chargepump
Addr: 1Dh
Ext. chargepump mode
This register selects the modes of the external chargepump
Bit
Bit Name
Default
Access
Description
1:0
cp_ext_mode
0
R/W
Selects the mode of the Ext. charge pump
00b = regulate to negative voltage (e.g.: -6V)
01b = regulate to positive voltage (e.g.:+15V)
10b = unregulated (free running)
11b = reserved Select the mode of the current sink CURR41
3:2
cp_ext_clk<1:0>
0
R/W
Selects the switching frequency
00b = 250kHz
01b = 500kHz
10b = 1MHz
11b = NA
4
cp_ext_lowcurr
0
R/W
Driving capability of ext. charge pump
0b = normal current = Iout
1b = reduced current = Iout / 4
Output noise and ripple will be reduced



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