LM3537_13 Datasheet, PDF (21/33 Pages) Texas Instruments – 8-Channel WLED Driver with Four Integrated LDOs

LM3537
www.ti.com
SNVS634B – JUNE 2011 – REVISED MAY 2013
Internal Registers of LM3537
The LM3537 is controlled by a set of registers through the two-wire serial interface port. Table 5 below lists
device registers and their addresses together with a short description.
Hex
Addr.
00
Register Name
MASTER ENABLE
10 DIODE ENABLE
20 CONFIGURATION
Table 5. Control Register Map
Bit(s)
[2]
[1]
[0]
[7]
[6]
[5]
[4]
[3]
[2]
[1]
[0]
[7]
[6]
[5]
[4]
[3]
[2]
[1]
[0]
Read/W Default Value
rite
After Reset
Bit Mnemonic and Description
R/W xxxxx0xx
group_A_en
Master enable for all the LEDs, which are assigned to group A. '1' =
LEDs ON '0' = LEDs OFF.
R/W xxxxxx0x
group_B_en
Master enable for all the LEDs, which are assigned to group B. '1' =
LEDs ON '0' = LEDs OFF.
W
xxxxxxx0
softw_rst
Writing = '1' to this register bit resets all the registers to factory
defaults. After writing, this bit is forced back to '0' automatically.
R/W 0xxxxxxx
enD8
ON/OFF Control for D8 output
R/W x0xxxxxx
enD7
ON/OFF Control for D7 output
R/W xx0xxxxx
enD6
ON/OFF Control for D6 output
R/W xxx0xxxx
enD5
ON/OFF Control for D5 output
R/W xxxx0xxx
enD4
ON/OFF Control for D4 output
R/W xxxxx0xx
enD3
ON/OFF Control for D3 output
R/W xxxxxx0x
enD2
ON/OFF Control for D2 output
R/W xxxxxxx0
enD1
ON/OFF Control for D1 output
R/W 0xxxxxxx
D7_int
Enables the Interrupt Pin. 1 = interrupt output enabled. 0 = interrupt
output disabled, LED driver operation. Reading the 0x40 register
clears the interrupt.
R/W x0xxxxxx
lin
Selects between linear and exponential dimming curve. Effective for
Group A only. 1 = linear dimming curve. 0 = exponential dimming
curve.
R/W xx1xxxxx
D8_A
Assign D8 diode to Group A Writing a '1' assigns D8 to BankA
(default) and a '0' assigns D8 to Group B.
R/W xxx1xxxx
D7_A
Assign D7 diode to Group A Writing a '1' assigns D7 to BankA
(default) and a '0' assigns D7 to Group B.
R/W xxxx1xxx
D6_A
Assign D6 diode to Group A Writing a '1' assigns D6 to BankA
(default) and a '0' assigns D6 to Group B.
R/W xxxxx1xx
D5_A
Assign D5 diode toGroup A . Writing a '1' assigns D5 to BankA
(default) and a '0' assigns D5 to Group B.
R/W xxxxxx0x
pwm_p
PWM input polarity. Writing a '0' = active high (default) and a '1' =
active low.
R/W xxxxxxx0
pwm_en
PWM input enable. Writing a '1' = Enable, and a '0' = Ignore
(default).
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