IS31FL3196A
Integrated Silicon Solution, Inc. — www.issi.com
Rev. D, 04/27/2018
13
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~OUT6) is selected by the CSS bits of
the Breathing Mark Register (06h).
When IS31FL3196A operates as slave, the breathing
mark function is unavailable.
Notice the CLK/V_BM output is push-pull structure and
high logic is VCC (same as Pin 1), so when this pin is
connected to controller GPIO, a 10k resistor is
recommended, otherwise the output pin voltage will
higher than the GPIO pin.
T0 T1 T2 T3 T1T4
Full Cycle
V_BM
Figure 9 V_BM Signal
CASCADE FOR SYNCHRONIZATION OF CHIPS
Operating in the cascade mode can make two chips
synchronize (Figure 2). By setting the CM bit of
Configuration Register 2 (04h) to “0”, IS31FL3196A
operates as a master. There are two pins (CLK, I_AUD)
for synchronization of chips. CLK pin can synchronize
the breathing and I_AUD pin can synchronize the
audio current.
SHUTDOWN MODE
Shutdown mode can either be used as a means of
reducing power consumption or generating a flashing
display (repeatedly entering and leaving shutdown
mode). During shutdown mode all registers retain their
data.
Software Shutdown
By setting SSD bit of the Shutdown Register (00h) to
“0”, the IS31FL3196A will operate in software
shutdown mode, wherein they consume only 2A (typ.)
current. When the IS31FL3196A is in software
shutdown mode, all current sources are switched off.
Hardware Shutdown
The chip enters hardware shutdown mode when the
SDB pin is pulled low, wherein they consume only 1A
(Typ.) current. When set SDB high, the rising edge will
reset the I2C module, but the register information
retains.
