IS31FL3731-QFLS2-TR ISSI, IS31FL3731-QFLS2-TR Datasheet - Page 17

• 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
can be operating with breath function by configuring
Breath Control Register 2 (09h).
AUTO FRAME PLAY MODE
By setting the MODE bit of the Configuration Register
(00h) to “01”, the IS31FL3731 operates in Auto Frame
Play Mode. It stores data of 8 frames and
automatically plays in order. Customers can configure
the delay time between each two frames and the first
playing frame by setting the FS bit of Configuration
Register (00h). The Auto Play Control Register 1 (02h)
can configure the display cycle and display frames.
Configure the Auto Play Control Register 2 (03h),
Breath Control Register 1 (08h) and Breath Control
Register 2 (09h) can set the breath time between two
frames switching.
AUDIO FRAME PLAY MODE
By setting the MODE bit of the Configuration Register
(00h) to “1x”, the IS31FL3731 operates in Audio Frame
Play Mode. It stores data of 8 frames and the 8 frames
playing follow the input signal. 0Ch register is used to
set the ADC sample rate for the input signal to control
frames playing. It plays the first frame when the value
is the smallest and plays the eighth frame when the
value is the biggest.
AUDIO MODULATED AND GAIN SETTING
By setting the AE bit of the Audio Synchronization
Register (06h) to “1”, IS31FL3731 operates with audio
synchronization. The intensity of LEDs is adjusted by
the input signal. The audio input gain can be set by the
AGC Control Register (0Bh).
BLINK FUNCTION SETTING
By setting the BE bit of the Display Option Register
(05h) to “1”, blink function enable. If the BE bit is set to
“1”, each LED can be controlled by the Blink Control
Registers (12h~23h in Page One to Page Eight). The
Display Option Register (05h) is used to set the blink
period time, BPT, and the duty cycle is 50% (Figure
11).
Integrated Silicon Solution, Inc. – www.issi.com
Rev.B, 09/10/2012
Figure 11 Blink function
BREATHING FUNCTION SETTING
When IS31FL3731 switches playing frame, breath
function is available. By setting the B_EN bit of the
Breath Control Register 2 (09h) to “1”, breath function
enable. When set the B_EN bit to “0”, breath function
disable.
INTERRUPT CONTROL
When IS31FL3731 is playing frame in the Auto Frame
Play Mode, the INTB pin is high and the INT bit of
Frame State Register (07h) is “0”. It will be pulled low
as movie end and the INT bit will be set to “1” at the
same time.
The INTB pin will come back to high level
automatically if it stays low at least 7ms. The INT bit
will reset to “0” only when reading the Frame State
Register (07h).
LED MATRIX CIRCUIT
The IS31FL3731 can drive 144 LEDs totally. Part of
LEDs can if there is no need to use all 144 LEDs
(Figure 13). But the LEDs which are no connected
must be off by LED Control Register (Frame Registers)
or it will affect other LEDs.
Figure 13 No C9-3~C9-5, C5-8~C9-8
Figure 12 Breathing function
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