LM3532TMX-40ANOPB National Semiconductor Corporation, LM3532TMX-40ANOPB Datasheet - Page 27

• Manufacturer Part Number: LM3532TMX-40ANOPB
• Description: High Efficiency White Led Driver With Programmable Ambient Light Sensing Capability And I2c-compatible Interface
• Manufacturer: National Semiconductor Corporation

OUTPUT CONFIGURATION
This register configures how the three control banks are rout-
ed to the current sinks (ILED1, ILED2, ILED3)
STARTUP/SHUTDOWN RAMP RATE
This register controls the ramping of the LED current in cur-
rent sinks ILED1, ILED2, and ILED3 during startup and shut-
down. The startup ramp rates/step are from when the device
is enabled via I
RUN TIME RAMP RATE
This register controls the ramping of the current in current
sinks ILED1, ILED2, and ILED3. The Run Time ramp rates/
Not Used
Bit [7:6]
Bits [7:6]
Not Used
Bits [7:6]
Not Used
2
00 = ILED3 is controlled by Control
A PWM and Control A Brightness
Registers (default)
01 = ILED3 is controlled by Control
B PWM and Control B Brightness
Registers
1X = ILED3 is controlled by Control
C PWM and Control C Brightness
Registers
C to when the target current is reached. The
000 = 8µs/step (2.048ms from Full-Scale to 0)
(default)
001 = 1.024 ms/step (261 ms)
010 = 2.048 ms/step (522 ms)
011 = 4.096 ms/step (1.044s)
100 = 8.192 ms/step (2.088s)
101 = 16.384 ms/step (4.178s)
110 = 32.768 ms/step (8.356s)
111 = 65.536 ms/step (16.711s)
000 = 8µs/step (default)
001 = 1.024 ms/step
010 = 2.048 ms/step
011 = 4.096 ms/step
100 = 8.192 ms/step
101 = 16.384 ms/step
110 = 32.768 ms/step
111 = 65.536 ms/step
TABLE 4. Startup/Shutdown Ramp Rate Register Description (Address 0x11)
ILED3 Control
TABLE 3. Output Configuration Register Description (Address 0x10)
TABLE 5. Run Time Ramp Rate Register Description (Address 0x12)
Bits [5:4]
Shutdown Ramp
Ramp Down
Bits [5:3]
Bits [5:3]
00 = ILED2 is controlled by Control A
PWM and Control A Brightness
Registers (default)
01 = ILED2 is controlled by Control B
PWM and Control B Brightness
Registers
1X = ILED2 is controlled by Control C
PWM and Control C Brightness
Registers
27
ILED2 Control
Bits [3:2]
Shutdown ramp rates/step are from when the device is shut
down via I
down the current sinks via I
ister.
step are from one current set-point to another after the device
has reached its initial target set point from turn-on.
000 = 8µs/step (2.048ms from Full-Scale to 0)
(default)
001 = 1.024 ms/step (261ms)
010 = 2.048 ms/step (522ms)
011 = 4.096 ms/step (1.044s)
100 = 8.192 ms/step (2.088s)
101 = 16.384 ms/step (4.178s)
110 = 32.768 ms/step (8.356s)
111 = 65.536 ms/step (16.711s)
000 = 8µs/step (default)
001 = 1.024 ms/step
010 = 2.048 ms/step
011 = 4.096 ms/step
100 = 8.192 ms/step
101 = 16.384 ms/step
110 = 32.768 ms/step
111 = 65.536 ms/step
2
C until the LED current is 0. To start up and shut
00 = ILED1 is controlled by Control A
PWM and Control A Brightness
Registers (default)
01 = ILED1 is controlled by Control B
PWM and Control B Brightness
Registers
1X = ILED1 is controlled by Control
C PWM and Control C Brightness
Registers
Startup Ramp
2
C, see the Control Enable Reg-
Bits [2:0]
Bits [2:0]
Ramp Up
ILED1 Control
Bits [1:0]
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