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AS3687 数据表(PDF) 22 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) 22 Page - ams AG

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AS3687/87XM
Datasheet
www.austriamicrosystems.com/AS3687
1v3-4
21 - 54
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
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 on CURR1 switched on, if voltage on
CURR1 exceeds 13.75V, and step_up_on=1
5
curr2_prot_on
0
R/W
0 = No overvoltage protection
1 = Pull down current on CURR2 switched on, if voltage
exceeds on CURR2 13.75V, and step_up_on=1
6
curr6_prot_on
0
R/W
0 = No overvoltage protection
1 = Pull down current on CURR6 switched on, if voltage on
CURR6 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 CURR1and CURR2 (never DCDC_FB). Only those
are used for this selection, which are enabled (currX_mode
must not be 00) and not connected to the charge pump
(currX_on_cp must be 0).
7.3.2 Current Sinks CURR30, CURR31, CURR32, CURR33
These current sinks have a resolution of 8 bits and can sink up to 40mA. The current values can be controlled
individually with curr30_current – curr33_current or common with curr3x_strobe or curr3x_preview.
Table
9 – Current Sinks CURR30,31,32,33 Parameters
Symbol
Parameter
Min
Typ
Max
Unit
Note
IBIT7
Current sink if Bit7 = 1
19.2
IBIT6
Current sink if Bit6 = 1
9.6
IBIT5
Current sink if Bit5 = 1
4.8
IBIT4
Current sink if Bit4 = 1
2.4
IBIT3
Current sink if Bit3 = 1
1.2
IBIT2
Current sink if Bit2 = 1
0.6
IBIT1
Current sink if Bit1 = 1
0.3
IBIT0
Current sink if Bit0 = 1
0.15
mA
For V(CURR3x) > 0.2V
Δm
matching Accuracy
-10
+10
%
CURR30-33
Δ
absolute Accuracy
-15
+15
%
VCURR3X
Voltage compliance
0.2
CPOUT
V
7.3.2.1 Current Sinks CURR3x Registers
Addr: 12h
Curr3 control1
This register select the modes of the current sinks30..33 current.
Bit
Bit Name
Default
Access Description
0
preview_off_after
strobe
0b
R/W
Select the switch off mode after strobe pulse
0 = normal preview/strobe mode,
1 = switch off preview after strobe duration has expired. To reinitiate
the torch mode the preview_ctrl has to be set off and on again



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