IS31FL3191-UTLS2-TR

IS31FL3191
Integrated Silicon Solution, Inc. www.issi.com 10
Rev. B, 07/10/2015
FUNCTIONAL BLOCK DIAGRAM
Bias
SDA
SCL
I2C
Interface
Digital
Control
PWM&
Breath
Control
Bandgap
Reference
Voltage
OUT
OSC
GND
VCC
SDB
IS31FL3191
Integrated Silicon Solution, Inc. www.issi.com 11
Rev. B, 07/10/2015
APPLICATION INFORMATION
GENERAL DESCRIPTION
IS31FL3191 is a 1-channel LED driver with
two-dimensional auto breathing and PWM Control
mode. It can drive two individual LEDs.
PWM CONTROL
By setting the LED bits of the LED Mode Register (03h)
to “0”, the IS31FL3191 will operate in PWM Control
mode. The PWM Registers (04h) can modulate LED
brightness of one channel with 256 steps. For example,
if the data in PWM Register is “0000 0100”, then the
PWM is the fourth step, with a duty cycle of 4/256.
In PWM control mode, a new value must be written to
the PWM registers to change the output PWM duty
cycle. Writing new data continuously to the registers
can modulate the brightness of the LEDs to achieve a
breathing effect, blinking, or any other effects that the
user defines.
LED BREATHING CONTROL
By setting the LED bits of the LED Mode Register (03h)
to “1”, the IS31FL3191 will operate in One Shot
Programming mode. In this mode, PWM Registers
(04h) are unavailable and the LED intensity is
automatically modulated in a breathing cycle,
independently controlled by T0~T4. T0 is an offset time
period which runs only once at the start of the cycle.
The full cycle is T1 to T4 (Figure 6).
Figure 6 Breathing Timing
SEMIAUTOMATIC BREATHING
By setting the LED bits of the LED Mode Register (02h)
to “1” and the RM bit of the Breathing Control Register
(01h) 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.
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
“1”, the IS31FL3191 will operate in software shutdown
mode, wherein they consume only 3.5μA (typ.) current.
When the IS31FL3191 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
2.5μA (typ.) current.
IS31FL3191
Integrated Silicon Solution, Inc. www.issi.com 12
Rev. B, 07/10/2015
CLASSIFICATION REFLOW PROFILES
Profile Feature Pb-Free Assembly
Preheat & Soak
Temperature min (Tsmin)
Temperature max (Tsmax)
Time (Tsmin to Tsmax) (ts)
150°C
200°C
60-120 seconds
Average ramp-up rate (Tsmax to Tp) 3°C/second max.
Liquidous temperature (TL)
Time at liquidous (tL)
217°C
60-150 seconds
Peak package body temperature (Tp)* Max 260°C
Time (tp)** within 5°C of the specified
classification temperature (Tc)
Max 30 seconds
Average ramp-down rate (Tp to Tsmax) 6°C/second max.
Time 25°C to peak temperature 8 minutes max.
Figure 7 Classification Profile

IS31FL3191-UTLS2-TR

Mfr. #:
Manufacturer:
ISSI
Description:
LED Lighting Drivers 1-Channel Fun LED Driver UTQFN-9
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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