IS31FL3731-QFLS2-TR ISSI, IS31FL3731-QFLS2-TR Datasheet - Page 13

• Manufacturer Part Number: IS31FL3731-QFLS2-TR
• Description: LED Lighting Drivers LED Driver
• Manufacturer: ISSI

Specifications of IS31FL3731-QFLS2-TR

• Input Voltage: 2.7 V to 5.5 V
• Operating Frequency: 400 kHz
• Maximum Supply Current: 2.17 mA
• Output Current: 34 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-28
• Minimum Operating Temperature: - 40 C
• Factory Pack Quantity: 2500

IS31FL3731
Table 12 05h Display Option Register
The Display Option Register sets display option of
IS31FL3731.
IC
0
1
BE
0
1
BPT
BPT = τ×A;
A = 0~7, τ = 0.27s (Typ.);
For example, when A = 5, BPT is 0.27s×5 = 1.35s.
The duty cycle for blink function is 50%.
Table 13 06h Audio Synchronization Register
The Audio Synchronization Register sets audio
synchronization function.
AE
0
1
intensity of the matrix
The intensity of matrix can be modulated by the audio
input signal basing on each LED’s current is set by
PWM when the AE bit is set to “1”.
Integrated Silicon Solution, Inc. – www.issi.com
Rev.B, 09/10/2012
Default
Name
Bit
Default
Name
Bit
D7:D6
00
-
independently
other frames
Intensity Control
Set the intensity of each frame
Use intensity setting of frame 1 for all
Blink Enable
Disable
Enable
Blink Period Time
Audio Synchronization Enable
Audio synchronization disable
Enable audio signal to modulate the
0000000
D7:D1
-
D5
IC
0
D4
0
-
BE
D3
0
AE
D0
0
D2:D0
000
A
Table 14 07h Frame State Register (Read Only)
The Frame State Register stores the frame display
information.
INT
(Available in Auto Frame Play Mode)
0
1
CFD
000
001
010
011
100
101
110
111
The INT bit will be set to “1” automatically when movie
is end in Auto Frame Play Mode. The INT bit can be
cleared up by reading the Frame State Register.
Table 15 08h Breath Control Register 1
The Breath Control Register 1 sets fade in and fade
out time for breath function.
FOT
FOT = τ×2
A = 0~7, τ = 26ms (Typ.)
For example, when A = 4, FOT is 26ms×2
FIT
FIT = τ×2
B = 0~7, τ = 26ms (Typ.)
For example, when A = 4, FIT is 26ms×2
Default
Name
Default
Name
Bit
Bit
B
A
D7:D5
-
D7
0
-
Interrupt Bit
Movie does not finish
Movie has finished
Current Frame Display
Frame 1
Frame 2
Frame 3
Frame 4
Frame 5
Frame 6
Frame 7
Frame 8
Fade Out Time
Fade In Time
INT
D4
D6:D4
000
A
-
D3
-
D3
0
-
4
4
= 416ms
= 416ms
D2:D0
CFD
D2:D0
000
B
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