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AS3677 データシート(PDF) 13 Page - ams AG

部品番号 AS3677
部品情報  Triple Channel Lighting Management Unit with DCDC step/up, ALS, 2xDLS(=DBC) and RGB Driver
PDF  68 Pages
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メーカー  AMSCO [ams AG]
ホームページ  http://www.ams.com
Logo AMSCO - ams AG

AS3677 データシート(HTML) 13 Page - ams AG

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www.austriamicrosystems.com/AS3677
1v3-1
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AS3677
Datasheet - D e ta i l e d D e s c r i p t i o n
8.2.3
PCB Layout Hints
To ensure good EMC performance of the DCDC converter, keep its external power components C1, L1, D1 and C2
close together. Connect the ground of C1, C2 locally together and connect this with a short path to AS3677 VSS. This
ensures that local high-frequency currents will not flow to the battery.
8.2.4
Step up Registers
Table 8. Reg control
Register
Addr: 00
Reg control
This register enables/disables the Charge Pump and the Step Up DC/DC
Converter.
Bit
Bit Name
Default Access
Description
3
step_up_on
0R/W
Enable the step up converter
0b
Disable the Step Up DC/DC Converter
1b
Enable the Step Up DC/DC Converter
Table 9. DCDC control1
Register
Addr: 21h
DCDC control1
This register controls the Step Up DC/DC Converter.
Bit
Bit Name
Default Access
Description
0
step_up_frequ
0
R/W
Defines the clock frequency of the Step Up DC/DC
Converter.
01MHz
1
500kHz
2:1
step_up_fb
01
R/W
Controls the feedback source if step_up_fb_auto = 0
00
no feedback selected - don’t use
01
CURR1 feedback enabled
(default)
10
CURR2 feedback enabled
11
CURR6 feedback enabled
4:3
step_up_vmax
00
R/W
Overvoltage protection for the DCDC step up
00
16V
01
10V
10
25V
11
don’t use (15.5V)
Table 10. DCDC control2
Register
Addr: 22h
DCDC control2
This register controls the Step Up DC/DC Converter and low-voltage current
sinks CURR3x.
Bit
Bit Name
Default Access
Description
1
skip_fast
0R/W
Step Up DC/DC Converter output voltage at low loads,
when pulse skipping is active
0
Accurate output voltage, more ripple
1
Elevated output voltage, less ripple



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