Datasheet

20
Atmel MSL2010 [DATASHEET]
42072A–AVR–05/2013
14. Detailed Register Descriptions
The MSL2010 registers are summarized in “Control Registers” on page 18. Detailed register information follows.
14.1 RAM (0x00 through 0x1F)
32 Bytes of RAM accessible through the I
2
C serial interface. Copy data from RAM into EEPROM (see “EEPROM and
Power-Up Defaults” on page 18) to have the data automatically load into the RAM at power up, and when EN is taken
high.
Table 14-1. RAM (0x00 through 0x1F), defaults undetermined
14.2 LED String Reference Voltage register (SREF, 0x20)
Holds the DAC value that controls the reference voltage for the LED string MOSFET source feedback. The reference
voltage equals decimal value of this register times 2mV. The default value for SREF is 0x64, which equates to
V
SREF
= 200mV.
Table 14-2. LED String Reference register (SREF, 0x20), defaults highlighted
14.3 Boost Reference Voltage register (CSREF, 0x21)
Holds the DAC value that controls the reference voltage for the Boost MOSFET source feedback. The reference voltage
equals decimal value of this register times 2mV. The default value for CSREF is 0x64, which equates to V
CSREF
= 200mV.
Table 14-3. Boost Reference Voltage register (CSREF, 0x21), defaults highlighted
REGISTER NAME ADDRESS
REGISTER DATA
D7 D6 D5 D4 D3 D2 D1 D0
DEFAULTS X X X X X X X X
REGISTER NAME ADDRESS
REGISTER DATA
D7 D6 D5 D4 D3 D2 D1 D0
SREF
0x20 SREF[7:0]
DEFAULT: V
SREF
= 0x64 = 100  2mV = 200mV
0 1 1 0 0 1 0 0
V
SREF
= 0  2mV = 0V
0 0 0 0 0 0 0 0
V
SREF
= 255  2mV = 510mV
1 1 1 1 1 1 1 1
REGISTER NAME ADDRESS
REGISTER DATA
D7 D6 D5 D4 D3 D2 D1 D0
CSREF
0x21 CSREF[7:0]
DEFAULT: V
CSREF
= 0x64 = 100  2mV = 200mV
0 1 1 0 0 1 0 0
V
CSREF
= 0  2mV = 0mV 0 0 0 0 0 0 0 0
V
CSREF
= 255  2mV = 510mV 1 1 1 1 1 1 1 1