IS31FL3218-QFLS2-TR ISSI, IS31FL3218-QFLS2-TR Datasheet - Page 7

• Manufacturer Part Number: IS31FL3218-QFLS2-TR
• Description: LED Lighting Drivers 18-Ch LED Drvr
• Manufacturer: ISSI

Specifications of IS31FL3218-QFLS2-TR

• Operating Frequency: 400 kHz
• Maximum Supply Current: 5.25 mA
• Output Current: 38 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-24
• Factory Pack Quantity: 2500

IS31FL3218
REGISTERS DEFINITIONS
Table 1 Register Function
Table 2 00h Shutdown Register
The Shutdown Register sets software shutdown mode
of IS31FL3218.
SSD
0
1
Table 3 01h~12h PWM Register(OUT1~OUT18)
The PWM Registers adjusts LED luminous intensity in
256 steps.
The value of a channel’s PWM Register decides the
average output current for each output, OUT1~OUT18.
The average output current may be computed using the
Formula (1):
Integrated Silicon Solution, Inc. – www.issi.com
Rev.B, 03/28/2012
01h~12h
Default
Address
Default
Name
Name
Bit
00h
13h
14h
15h
16h
17h
Bit
Software Shutdown Enable
Software shutdown mode
Normal operation
Shutdown Register
PWM Register
LED Control Register1
LED Control Register2
LED Control Register3
Update Register
Reset Register
Reserved
Name
000000
D7:D1
0000 0000
D7:D0
PWM
Figure 5 Writing to IS31FL3218(Automatic address increment)
Set software shutdown mode
18 channels PWM duty cycle data register
Channel 1 to 6 enable bit
Channel 7 to 12 enable bit
Channel 13 to 18 enable bit
Load PWM Register and LED Control
Register’s data
Reset all registers into default
SSD
D0
0
Function
Where “n” indicates the bit location in the respective
PWM register.
For example: D7:D0 = 10110101,
See Formula (2) in Page 9 to calculate the I
Table 4 13h LED Control Register 1
(OUT1~OUT6)
Table 5 14h LED Control Register 2
(OUT7~OUT12)
Default
Default
Name
Name
Bit
Bit
I
I
OUT
Reserved
Reserved
OUT
D7:D6
D7:D6
00
00
= I

MAX
I
256
MAX
(2

0
+2

n
7

0
Table
2
D
+2
2
3
4
5
6
-
-
[
4
n
OUT12:OUT7
+2
OUT6:OUT1
]

5
2
000000
000000
+2
D5:D0
D5:D0
n
7
)/256
0000 0000
xxxx xxxx
Default
MAX.
(1)
7