Datasheet

27
MSL2021 [DATASHEET]
42062A–LED–02/2013
Table 12-3. EEPROM Status Register (E2CTRL, 0x61), defaults highlighted.
13. Detailed Register Descriptions
The MSL2021 registers are summarized in “Control Registers” on page 25. Detailed register information follows.
13.1 String Duty Cycle Control Registers (SDCR18 through SDCR80, 0x00 through 0x1F)
Holds the look-up table for the thermistor color-adjust string duty cycle correction. See “Light Color and the THM Input”
on page 20 for information. Put the device to sleep using SLEEP register 0x24 before modifying the SDCR values to
avoid undesired changes in the light output of the LEDs.
Table 13-1. String Duty Cycle Control Registers (SDCR18 through SDCR80, 0x00 through 0x1F), defaults highlighted
13.2 Main String Reference Voltage register (MREF, 0x20)
Holds the DAC value that controls the reference voltage for the main string FET source feedback voltage. The reference
voltage equals decimal value of this register times 2mV. The default value for MSREF is 0x64, which equates to MS
REF
=
200mV.
Register Address
Register data
D7 D6 D5 D4 D3 D2 D1 D0
E2CTRL 0x61 - - - - - RWCTRL[2:0]
DEFAULT 00000000
EEPROM Read / Write Disabled xxxxx000
Read 1 Byte from EEPROM x x x x x 0 0 1
Read 8 Bytes from EEPROM x x x x x 0 1 0
Write 1 Byte to EEPROM x x x x x 0 1 1
Write 8 Bytes to EEPROM x x x x x 1 0 0
Unused
x x x x x 1 0 1
x x x x x 1 1 x
Register name Address
Register data
D7 D6 D5 D4 D3 D2 D1 D0
SDCR18 through SDCR80 0x00 – 0x1F SDCR[7:0]
DEFAULT (See Table 11-2 on page 21) XXXXXXXX
Correction factor = 0 00000000
Correction factor = 1 11111111