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AS3677 数据表(PDF) 19 Page - ams AG

部件名 AS3677
功能描述  Triple Channel Lighting Management Unit with DCDC step/up, ALS, 2xDLS(=DBC) and RGB Driver
PDF  68 Pages
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制造商  AMSCO [ams AG]
网页  http://www.ams.com
标志 AMSCO - ams AG

AS3677 数据表(HTML) 19 Page - ams AG

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AS3677
Datasheet - D e ta i l e d D e s c r i p t i o n
8.4
Current Sinks
The AS3677 contains three general purpose current sinks intended to control backlight LEDs.
CURR1, CURR2 and CURR6 are used as feedback for the Step Up DC/DC Converter (regulated to 0.5V in this config-
uration) see Feedback Selection on page 11.
The processing inside the AS3677 is shown in Figure 15 (shown for one current source only):
Table 18. Curr low voltage status2
Register
Addr: 2Bh
Curr low voltage status2
Indicates the low voltage status of the current sinks. If the currX_low_v bit is
set, the voltage on the current sink is too low, to drive the selected output
current
Bit
Bit Name
Default Access
Description
0
curr1_low_v
NA
R
0
voltage of current Sink CURR1 >currhv_switch
1
voltage of current Sink CURR1 <currhv_switch
1
curr2_low_v
NA
R
0
voltage of current Sink CURR2 >currhv_switch
1
voltage of current Sink CURR2 <currhv_switch
Table 19. Current Sink Function Overview
Current Sink
Max.
Voltage (V)
Max.
Current
(mA)
Resolution
Software Current
Control
Hardware On/Off
Control
(Bits)
(mA)
RGB1
5.5
25.5
8
0.1
Separate
Internal PWM; external
PWM at DLS1, Pattern
generator
RGB2
RGB3
CURR1
26.0
25.5
8
0.1
Separate
Internal PWM; external
PWM at DLS1, Pattern
generator
CURR2
Internal PWM; external
PWM at DLS1 or
DLS2, Pattern
generator
CURR6



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