IS31FL3199
Integrated Silicon Solution, Inc. — www.issi.com
Rev. B, 12/25/2013
12
TYPICAL APPLICATION
GENERAL DESCRIPTION
IS31FL3199 is a 9-channel LED driver with
two-dimensional auto breathing and PWM Control
mode. It can drive nine LEDs or three groups RGB.
PWM CONTROL
By setting the RGBx bits of the Configuration Register1
(03h) to “0”, the IS31FL3199 will operate in PWM
Control mode. The PWM Registers (07h~0Fh) can
modulate LED brightness of 9 channels with 256 steps.
For example, if the data in PWM Register is “0000
0100”, then the PWM is the fourth step.
Writing new data continuously to the registers can
modulate the brightness of the LEDs to achieve a
breathing effect.
RGB BREATHING CONTROL WITH AUTO COLOR
CHANGING
By setting the RGBx bits of the Configuration Register1
(03h) to “1”, the IS31FL3199 will operate in One Shot
Programming mode. In this mode each group RGB can
be modulated breathing cycle independently by T0~T4.
The full cycle is T1 to T4 (Figure 7). Setting different
T0~T4 can achieve RGB breathing with auto color
changing. The maximum intensity of each RGB can be
adjusted independently by the PWM Registers
(07h~0Fh).
Note, if IS31FL3199 operates in the One Shot
Programming mode and then enters into the shutdown
mode, an 8-bit data write operation to the Time Update
Register is required to restart the LED breathing effect
after the IC is re-enabled.
Figure 7 Breathing Timing
RGB AUTO BREATHING CONTROL WITH COLOR
SETTING
IS31FL3199 can pre-establish pattern achieving mixing
color breathing. There are three groups RGB. Each
RGB consists of three channels. Every channel has an
8-bit PWM data register. The color can be set by the
PWM data register. For example, there are three PWM
data: 20h, 80h, C8h, so the three data will determine a
kind of color.
After setting the color, T0~T4 time register will be set to
control the LED breathing panel. And T0~T4 time
should be same for one RGB or the pre-established
color will change.
SEMIAUTOMATIC BREATHING
By setting the RGBx bits of the Configuration
Register1 (03h) to “1” and the RM bit of the Ramping
Mode Register (05h) to “1”, the ramping function is
enabled. HT is the time select bit. When HT bit is set to
“0”, T2 will be held forever, and the LED will remain at
the programmed maximum intensity. When HT bit is
set to “1”, T3 will continue and T4 will be held, causing
the LED to complete one breathing cycle and then
remain off.
AUDIO MODULATE DISPLAY MODE WITH AGC
FUNCTION
In audio modulate display mode the output current can
be modulated by the audio input signal. An AGC
automatically adjusts the audio input gain to improve
the dynamic range of the LED current modulation, thus
improving the visual effect. When the input signal is
large such that the amplifier output begins to clip, the
gain goes down. If the input signal is small, the gain
increases, adjusting the output to provide a good
dynamic response to the input signal.
The AGC can be disabled and the audio gain can be
set by programming Configuration Register 1 (03h).
BREATHING MARK FUNCTION
By setting the BME bit of the Breathing Mark Register
(06h) to “1”, the breathing mark function is enabled.
The CLK/V_BM pin is used as V_BM. If the BME bit
sets to “0”, the breathing mark function disabled. The
CLK/V_BM pin is used as CLK. V_BM is an output pin.
The breathing mark function is useful as a signal to
notify the MCU when to update the color data. At the
end of time period T1, V_BM will induce a falling edge
and hold logic low, so the new data can be sent by
MCU at this time. At the end of T3, V_BM will induce a
rising edge and the MCU can send an update
command to update all data simultaneously (Figure 8).
The marking channel (OUT1~OUT9) is selected by the
CSS bits of the Breathing Mark Register (06h).
When IS31FL3199 operates as slave, the breathing
mark function is unavailable.
Figure 8 V_BM Signal
