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AS1130 Datasheet(PDF) 55 Page - ams-OSRAM AG

Part # AS1130
Description  132-LED Cross-Plexing Driver with Scrolling Function
PDF  67 Pages
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Manufacturer  AMSOSRAM [ams-OSRAM AG]
Direct Link  https://ams-osram.com/
Logo AMSOSRAM - ams-OSRAM AG

AS1130 Datasheet(HTML) 55 Page - ams-OSRAM AG

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Page 54
ams Datasheet
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[v2-01] 2016-Oct-12
AS1130 − Typical Application
LED Current Calculation
The current through a LED in the matrix is set via three registers
(Current Source Register, Dot Correction and PWM). The
resulting current through the single LED can be calculated as
shown in the following.
First it is necessary to calculate the time how long one LED will
be ON.
Where:
tLEDon: Time where the LED is ON
PWM:. Value set in the register (0 - 256), see Figure 36
fOSC: Frequency set in the CLK Synchronization Register, see
Figure 50.
The refresh rate is defined by the scan-limit and fOSC.
Where:
tREFRESH: Time needed to refresh the matrix scan-limit. is set via
the Display Option Register (0 - 11), see Figure 43
fOSC: frequency set in the CLK Synchronization Register, see
Figure 50
With the LED on-time and the refresh rate an average LED ON
factor can be calculated.
The resulting current is then the Segment Current (set in the
Current Source Register) times the average LED ON factor.
Where:
ISEG: Segment Current set via register Figure 44
Example:
Assume that following conditions are set in the registers:
PWM = 256, scan-limit = 5 (half filled matrix, 66 LEDs),
ISEG = 30mA
(EQ1)
tLEDon
PWM
fOSC
---------------
=
(EQ2)
tREFRESH
scanlimit 1
+
() 256
×
fOSC
------------------------------------------------------
=
(EQ3)
LEDonavg
tLEDon
tREFRESH
------------------------
PWM
scanlimit 1
+
() 256
×
------------------------------------------------------
==
(EQ4)
ILEDavg
ISEG LEDonavg
×
ISEG
PWM
scanlimit 1
+
() 256
×
------------------------------------------------------
×
==
(EQ5)
ILEDavg
30mA
256
51
+
() 256
×
--------------------------------
×
5mA
==



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