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AS3676 数据表(PDF) 21 Page - ams AG

部件名 AS3676
功能描述  Flexible Lighting Management
PDF  92 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  AMSCO [ams AG]
网页  http://www.ams.com
标志 AMSCO - ams AG

AS3676 数据表(HTML) 21 Page - ams AG

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AS3676
Datasheet - D e ta i l e d D e s c r i p t i o n
8.3.3 Unused Charge Pump
If the charge pump is not used, capacitors C3, C4 and C5 can be removed. The pins C1_P, C1_N, C2_P, C2_N and
CPOUT should be left open and keep register cp_on and cp_auto_on at 0 (default value).
8.3.4
Charge Pump Registers
Table 15. Reg. control
Register
Addr: 00h
Reg. control
This register controls the Charge Pump.
Bit
Bit Name
Default Access
Description
2
cp_on
0R/W
0
Set Charge Pump into 1:1 mode (off state) unless
cp_auto_on is set
1
Enable manual or automatic mode switching
Table 16. CP control
Register
Addr: 23h
CP control
This register enables/disables the Charge Pump and the Step Up DC/DC
Converter.
Bit
Bit Name
Default Access
Description
0
cp_clk
0R/W
Clock frequency selection.
01 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)
1
1. 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.
00
1:1 mode
01
1:1.5 mode
10
1:2 mode
11
NA
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
01
Automatic Mode switching; only 1:1 and 1:1.5
allowed
10
Manual Mode switching; register cp_mode defines
the actual charge pump mode used
11
Reserved
5
cp_start_debounce
0R/W
0
Mode switching debounce timer is always 240µs
1
Upon startup (cp_on set to 1) the mode switching
debounce time is first started with 2ms then
reduced to 240µs
6
cp_auto_on
0R/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



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