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AS3687 Datenblatt(PDF) 18 Page - ams AG

Teilenummer AS3687
Bauteilbeschribung  Flexible Lighting Management
PDF  55 Pages
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Hersteller  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3687 Datenblatt(HTML) 18 Page - ams AG

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AS3687/87XM
Datasheet
www.austriamicrosystems.com/AS3687
1v3-4
17 - 54
Addr: 23h
CP Control
This register controls the Charge Pump.
Bit
Bit Name
Default
Access
Description
0
cp_clk
0
R/W
Clock frequency selection.
0 = 1 MHz
1 = 500 kHz
2:1
cp_mode
00b
R/W
Charge Pump mode (in manual mode sets this mode, in
automatic mode reports the actual mode used)
00 = 1:1 mode
01 = 1:1.5 mode
10 = 1:2 mode
11 = NA
Note:
Direct switching from 1:1.5 mode into 1:2 in manual
mode and vice versa is not allowed. Always switch over 1:1
mode.
4:3 cp_mode_switching
00b
R/W
Set the mode switching algorithm:
00 = Automatic Mode switching; 1:1, 1:1.5 and 1:2 allowed
1
01 = Automatic Mode switching; only 1:1 and 1:1.5 allowed
1
10 = Manual Mode switching; register cp_mode defines the
actual charge pump mode used
11 = reserved
5
cp_start_debounce
0
R/W
0 = Mode switching debounce timer is always 240us
1 = Upon startup (cp_on set to 1) the mode switching
debounce time is first started with 2ms then reduced to
240us
6
cp_auto_on
0
R/W
0 = Charge Pump is switched on/off with cp_on
1 = Charge Pump is automatically switched on if a current
sink, which is connected to the charge pump (defined by
registers CP Mode Switch 1 & 2) is switched on
Note :
1.
Don’t use automatic mode switching together with external PWM for the current sources connceted
to the charge pump with less than 500us high time.
CP Mode Switch 1
Addr: 24h
Setup which current sinks are connected (via leds) to the charge pump; if set to ‘1’ the
correspond current source (sink) is used for automatic mode selection of the charge
pump
Bit
Bit Name
Default
Access
Description
0
curr30_on_cp
0
R/W
0 = current Sink CURR30 is not connected to charge pump
1 = current sink CURR30 is connected to charge pump
1
curr31_on_cp
0
R/W
0 = current Sink CURR31 is not connected to charge pump
1 = current sink CURR31 is connected to charge pump
2
curr32_on_cp
0
R/W
0 = current Sink CURR32 is not connected to charge pump
1 = current sink CURR32 is connected to charge pump
3
curr33_on_cp
0
R/W
0 = current Sink CURR33 is not connected to charge pump
1 = current sink CURR33 is connected to charge pump



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