LP5520TL NSC [National Semiconductor], LP5520TL Datasheet - Page 10

• Manufacturer Part Number: LP5520TL
• Description: RGB Backlight LED Driver
• Manufacturer: NSC [National Semiconductor]

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CALIBRATION MEMORY
The 1 kbit calibration EEPROM memory is organized as 128 x 8 bits. It stores the 12-bit calibration PWM values for each output
at 16°C intervals. 10 temperature points are used to cover the range from –40 to 120°C. The temperature or light sensor calibration
data, self heating factor and LED currents are also stored in the memory. The memory contents and detailed memory map are
shown in the following tables.
The EEPROM contents
Compensated Color Coordinates vs. Temperature
Data
10 PWM values for red
10 coefficients for red between the points
10 PWM values for green
10 coefficients for green between the points
10 PWM values for blue
10 coefficients for blue between the points
0°C reading for temperature sensor
Coefficient for temperature sensor
Maximum self-heating (100% red PWM)
Default current for ROUT
Default current for GOUT
Default current for BOUT
Free memory for user data
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Compensated Blue LED Intensity vs. Temperature
Length
12
12
12
12
12
8
8
8
8
8
8
8
8
Total bits
120
120
120
368
80
80
80
12
12
8
8
8
8
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