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AS3687 数据表(PDF) 13 Page - ams AG

部件名 AS3687
功能描述  Flexible Lighting Management
PDF  55 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

AS3687 数据表(HTML) 13 Page - ams AG

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AS3687/87XM
Datasheet
www.austriamicrosystems.com/AS3687
1v3-4
12 - 54
DCDC Control 1
Addr: 21h
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.
0 = 1 MHz
1 = 500 kHz
2:1
step_up_fb
00
R/W
Controls the feedback source if step_up_fb_auto = 0
00 = DCDC_FB enabled (external resistor divider).
Set step_up_fb=00 (DCDC_FB), if external
PWM is enabled for CURR1, CURR2 or CURR6
01 = CURR1 feedback enabled (feedback via white LEDs.
10 = CURR2 feedback enabled (feedback via white LEDs.
11 = CURR6 feedback enabled (feedback via white LEDs.
7:3
step_up_vtuning
00000
R/W
Defines the tuning current at pin DCDC_FB.
00000 = 0
μA
00001 = 1
μA
00010 = 2
μA
…
10000 = 15
μA
…
11111 = 31
μA
DCDC Control 2
Addr: 22h
This register controls the Step Up DC/DC Converter and low-voltage current sinks
CURR3x.
Bit
Bit Name
Default
Access
Description
0
step_up_res
0
R/W
Gain selection for Step Up DC/DC Converter.
0 = Select 0 if Step Up DC/DC Converter is used with
current feedback (CURR1, CURR2 , CURR6) or if
DCDC_FB is used with current feedback only – only R1,
C1 connected
1 = Select 1 if DCDC_FB is used with external resistor
divider (2 resistors).
1
skip_fast
0
R/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.
2
step_up_prot
1
R/W
Step Up DC/DC Converter protection.
0 = No overvoltage protection.
1 = Overvoltage protection on pin DCDC_FB enabled
voltage limitation =1.25V on DCDC_FB
3
stepup_lowcur
1
R/W
Step Up DC/DC Converter coil current limit.
0 = Normal current limit
1 = Current limit reduced by approx. 33%
4
curr1_prot_on
0
R/W
0 = No overvoltage protection
1 = Pull down current switched on, if voltage exceeds
13.75V, and step_up_on=1
5
curr2_prot_on
0
R/W
0 = No overvoltage protection
1 = Pull down current switched on, if voltage exceeds
13.75V, and step_up_on=1
6
curr6_prot_on
0
R/W
0 = No overvoltage protection
1 = Pull down current switched on, if voltage exceeds
13.75V, and step_up_on=1
7
step_up_fb_auto
0
R/W
0 = step_up_fb select the feedback of the DCDC converter
1 = The feedback is automatically chosen within the current
sinks CURR1, CURR2 and CURR6 (never DCDC_FB).



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