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PDF IS31FL3235 Data sheet ( Hoja de datos )
| Número de pieza | IS31FL3235 | |
| Descripción | 28 CHANNELS LED DRIVER | |
| Fabricantes | ISSI | |
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IS31FL3235
28 CHANNELS LED DRIVER
October 2014
GENERAL DESCRIPTION
IS31FL3235 is comprised of 28 constant current
channels each with independent PWM control,
designed for driving LEDs. The output current of each
channel can be set at up to 38mA (Max.) by an external
resistor and independently scaled by a factor of 1, 1/2,
1/3 and 1/4. The average LED current of each channel
can be changed in 256 steps by changing the PWM
duty cycle through an I2C interface.
The chip can be turned off by pulling the SDB pin low or
by using the software shutdown feature to reduce
power consumption.
IS31FL3235 is available in QFN-36 (4mm × 4mm)
package. It operates from 2.7V to 5.5V over the
temperature range of -40°C to +85°C.
FEATURES
2.7V to 5.5V supply
I2C interface, automatic address increment
function
Internal reset register
Modulate LED brightness with 256 steps PWM
Each channel can be controlled independently
Each channel can be scaled independently by 1,
1/2, 1/3 and 1/4
ESD HBM 8kV
-40°C to +85°C temperature range
QFN-36 (4mm × 4mm) package
APPLICATIONS
Mobile phones and other hand-held devices for
LED display
LED in home appliances
TYPICAL APPLICATION CIRCUIT
Figure 1 Typical Application Circuit
Note 1: The maximum global output current is set up to 23mA when REXT = 3.3kΩ. The maximum global output current can be set by external
resistor, REXT. Please refer to the detail information in Page 10.
Note 2: The IC should be placed far away from the mobile antenna in order to prevent the EMI.
Integrated Silicon Solution, Inc. – www.issi.com
Rev. B, 10/11/2014
1
1 page  
IS31FL3235
DIGITAL INPUT SWITCHING CHARACTERISTICS (Note 2)
Symbol
Parameter
Condition Min.
Typ.
Max.
fSCL Serial-Clock frequency
tBUF
Bus free time between a STOP and a START
condition
1.3
400
tHD, STA
tSU, STA
tSU, STO
tHD, DAT
tSU, DAT
tLOW
tHIGH
tR
Hold time (repeated) START condition
Repeated START condition setup time
STOP condition setup time
Data hold time
Data setup time
SCL clock low period
SCL clock high period
Rise time of both SDA and SCL signals,
receiving
(Note 3)
0.6
0.6
0.6
0.9
100
1.3
0.7
20+0.1Cb 300
tF
Fall time of both SDA and SCL signals,
receiving
(Note 3)
20+0.1Cb 300
Note 1: The recommended minimum value of REXT is 2kΩ, or it may cause a large current.
Note 2: Guaranteed by design.
Note 3: Cb = total capacitance of one bus line in pF. ISINK ≤ 6mA. tR and tF measured between 0.3 × VCC and 0.7 × VCC.
Unit
kHz
μs
μs
μs
μs
μs
ns
μs
μs
ns
ns
Integrated Silicon Solution, Inc. – www.issi.com
Rev. B, 10/11/2014
5
5 Page 
IS31FL3235
256
224
192
160
128
96
64
32
0
0 8 16 24 32 40 48 56 64
Intensity Steps
Figure 7 Gamma Correction(64 Steps)
Note, the data of 32 gamma steps is the standard value and the data
of 64 gamma steps is the recommended value.
SHUTDOWN MODE
Shutdown mode can be used as a means of reducing
power consumption. During shutdown mode all
registers retain their data.
SOFTWARE SHUTDOWN
By setting SSD bit of the Shutdown Register (00h) to
“0”, the IS31FL3235 will operate in software shutdown
mode. When the IS31FL3235 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.
Integrated Silicon Solution, Inc. – www.issi.com
Rev. B, 10/11/2014
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet IS31FL3235.PDF ] | |
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