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IS31FL3731 Datasheet(PDF) 10 Page - Integrated Silicon Solution, Inc

Part # IS31FL3731
Description  AUDIO MODULATED MATRIX LED DRIVER
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Manufacturer  ISSI [Integrated Silicon Solution, Inc]
Direct Link  http://www.issi.com
Logo ISSI - Integrated Silicon Solution, Inc

IS31FL3731 Datasheet(HTML) 10 Page - Integrated Silicon Solution, Inc

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IS31FL3731
Integrated Silicon Solution, Inc. – www.issi.com
10
Rev.B, 09/10/2012
REGISTER CONTROL
FRAME REGISTER
Table 4 00h ~ 11h LED Control Register
Bit
D7:D0
Name
CX-8 : CX-1 or CX-16 : CX-9
Default
xxxx xxxx
The LED Control Registers store the on or off state of
each LED in the Matrix A and B. Please refer to the
detail information in Table 7.
CX-Y
LED State Bit
0
LED off
1
LED on
Figure 8 in Page 10 shows the ordering of CX-Y.
Table 5 12h ~ 23h Blink Control Register
Bit
D7:D0
Name
CX-8 : CX-1 or CX-16 : CX-9
Default
xxxx xxxx
The Blink Control Registers configure the blink
function of each LED in the Matrix A and B. Please
refer to the detail information in Table 7.
CX-Y
Blink Control Bit
0
Disable
1
Enable
Figure 8 in Page 10 shows the ordering of CX-Y.
Table 6 24h ~ B3h PWM Register
Bit
D7:D0
Name
PWM
Default
xxxx xxxx
PWM Registers modulate the 144 LEDs in 256 steps.
The value of the PWM Registers decides the output
current of each LED. The output current may be
computed using the Formula (1):
7
0
PWM
2
]
[
256
I
n
n
LED
n
D
I
(1)
Where D[n] stands for the individual bit value, 1 or 0,
in location n.
For example: if D7:D0 = 10110101,
IPWM = ILED (2
0+22+24+25+27)/256
ILED is set by the external resistor, REXT, ILED =
64.7/REXT.
For example, when REXT = 20kΩ, ILED = 64.7/20 =
3.2mA.


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