SS

SCK

SI

SO

Don't Care

A6

A5

A4

A3

A2

A1

A0

R/W

0

D7

D6

D5

D4

D3

D2

D1

D0

SS

SCK

SI

SO

A6

A5

A4

A3

A2

A1

A0

1

R/W

D7

D6

D5

D4

D3

D2

D1

D0

24

LP5520

SNVS440B – MAY 2007 – REVISED MARCH 2016

www.ti.com

Product Folder Links: LP5520

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Copyright © 2007–2016, Texas Instruments Incorporated

Programming (continued)

Figure 29. SPI Write Cycle

Figure 30. SPI Read Cycle

7.5.1.2.1

SPI Incremental Addressing

The LP5520 supports incremental addressing for memory read and write.

7.5.2 EEPROM Memory

The 1-kbit calibration EEPROM memory is organized as 128 × 8 bits. It stores the 12-bit calibration PWM values

for each output at 16°C intervals. Ten 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 Table 10 and Table 11.

Table 10. EEPROM Contents

DATA

LENGTH

TOTAL BITS

10 PWM values for red

12

120

10 coefficients for red between the points

8

80

10 PWM values for green

12

120

10 coefficients for green between the points

8

80

10 PWM values for blue

12

120

10 coefficients for blue between the points

8

80

0°C reading for temperature sensor

12

12

Coefficient for temperature sensor

12

12

Maximum self-heating (100% red PWM)

8

8

Default current for ROUT

8

8

Default current for GOUT

8

8

Default current for BOUT

8

8

Free memory for user data

8

368