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AS3661-BWLT Datasheet(PDF) 11 Page - ams AG

Part # AS3661-BWLT
Description  Programmable 9-channel LED Dr iver
Download  87 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3661-BWLT Datasheet(HTML) 11 Page - ams AG

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www.austriamicrosystems.com
Revision 1.3
10 - 85
AS3661
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
Figure 3. I
2C mode Timing Diagram
.
3. Output current accuracy is the difference between actual value of the output current and programmed value of
this current. IMATCH is determined as follows:
For the constant current D1 to D9, the following are determined: The maximum current (max) and the minimum
current (min), then the IMATCH is calculated with: IMATCH = 100*(((max-min)/2)+((max+min)/2))/((max+min)/2)-
100
4. Saturation voltage is defined as the voltage when the LED current has dropped 10% from the value measured
at VCP - 1V.
5. Total unadjusted error includes offset, full-scale and linearity errors.
6. The I2C host should allow at least 500µs before sending data the AS3661after the rising edge of the enable
line.
Table 4. Electrical Characteristics I
2
C
1
Symbol
Parameter
Condition
Min
Typ
Max
Unit
I
2C mode timings - see Figure 3 on page 10
fSCLK
SCL Clock Frequency
0
400
kHz
tBUF
Bus Free Time
Between a STOP and
START Condition
1.3
µs
tHD:STA
Hold Time (Repeated)
START Condition
2
0.6
µs
tLOW
LOW Period of SCL
Clock
1.3
µs
tHIGH
HIGH Period of SCL
Clock
0.6
µs
SCL
SDA
tBUF
tHD:STA
tSU:STA
REPEATED
START
tSU:STO
tF
tSU:DAT
tHIGH
tHD:DAT
tR
tLOW
tHD:STA
START
STOP


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