LM3537_13 Datasheet, PDF (23/33 Pages) Texas Instruments – 8-Channel WLED Driver with Four Integrated LDOs

LM3537
www.ti.com
SNVS634B – JUNE 2011 – REVISED MAY 2013
Hex
Addr.
52
Register Name
ALS CONFIG
60 ALS ZONE
BOUNDARY#0
61 ALS ZONE
BOUNDARY#1
62 ALS ZONE
BOUNDARY#2
63 ALS ZONE
BOUNDARY#3
64 ALS LOW to HIGH
TP
65 ALS ZONE
BOUNDARY Z3 to
Z2
70 ALS BRIGHTNESS
ZONE#0
71 ALS BRIGHTNESS
ZONE#1
72 ALS BRIGHTNESS
ZONE#2
73 ALS BRIGHTNESS
ZONE#3
74 ALS BRIGHTNESS
ZONE#4
A0 GROUP A
BRIGHTNESS
Table 5. Control Register Map (continued)
Bit(s)
[7]
[6]
[5]
[3]
[2]
[1]
[0]
[7:0]
[7:0]
[7:0]
[7:0]
[7:0]
[7:0]
Read/W Default Value
rite
After Reset
Bit Mnemonic and Description
R/W 0xxxxxxx
autogain_en
'1' = Enables autogain for the external ambient light sensor.
'0' = disables autogain and GPO's are controlled by the gpo1 and
gpo2 -bits. See Table 2 for details.
R/W x0xxxxxx
sbias_en
'1' = External sensor power output enabled.
'0' = External sensor power output disbaled.
Note: '1' -> GPOs will behave as push-pull CMOS outputs
referenced to voltage on SBIAS. '0 '-> GPOs will act as open-drain
outputs (default).
R/W xx0xxxxx
sbias_volt
Sensor bias output voltage selection.
'1' = 3.0V output voltage.
'0' = 2.4V output voltage.
R/W xxxx0xxx
cp_en
Writing = '1' to this register bit enables the Charge-Pump block.
Forces the LM3537 to operate in the gain of 1.5x. This mode DOES
NOT require the Dx current sinks to be enabled for operation.
R/W xxxxx0xx
pass_en
Writing = '1' to this register bit forces the LM3537 to operate in the
gain of 1x (pass-mode). This mode DOES NOT require the Dx
current sinks to be enabled for operation. Note: 1.5x gain (cp_en bit)
has a higher priority.
R/W xxxxxx0x
gpo1
'0' = GPO1 pin state is low. '1' = GPO1 pin state is high. Effective
only when the autogain is disabled.⁽¹⁾
R/W xxxxxxx0
gpo2
'0' = GPO2 pin state is low. '1' = GPO2 pin state is high. Effective
only when the autogain is disabled.⁽¹⁾
R/W 00110011
zb0
Sets Zone0 to Zone1 transition trip point
R/W 01100110
zb1
Sets Zone1 to Zone2 transition trip point
R/W 10011001
zb2
Sets Zone2 to Zone3 transition trip point
R/W 11001100
zb3
Sets Zone3 to Zone4 transition trip point
R/W 00001011
LtoH
Sets the trip point for low gain to high gain transition. Effective only
when autogain = '1'.
R/W 00010000
zb3to2
Zone3 to Zone2 transition trip point when the autogain is enabled.
[6:0] R/W x0111100
[6:0] R/W x1001101
[6:0] R/W x1011001
[6:0] R/W x1100110
[6:0] R/W x1110010
[6:0] R/W x0000000
z0b
Sets the Zone Brightness code for Zone0.
z1b
Sets the Zone Brightness code for Zone1.
z2b
Sets the Zone Brightness code for Zone2.
z3b
Sets the Zone Brightness code for Zone3.
z4b
Sets the Zone Brightness code for Zone4.
dxa
Sets Brightness for Group A. 128 steps, 1111111=Fullscale.
(1) V_{OUT_S} = SBIAS pin output voltage. The voltage level of the GPOs depends on the sbias_en-bit: '1'; GPOs will behave as push-pull
outputs and will reference the high-side to the voltage of SBIAS. '0'; GPOs will act as open-drain outputs (default). In the open-drain
configuration, they can be high-side referenced to any voltage equal to, or less than, the VIN_A of the LM3537. Output High Level (V_OH)
specification is valid only for push-pull -type outputs.
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