Datasheet
30
MSL2021 [DATASHEET]
42062A–LED–02/2013
13.8 Password Verification registers
(PWV(HIGH) and PWV(LOW), 0x38 and 0x39)
Use these registers when locking the look-up table of the MSL2021. Also, enter the password (chosen when the Look-Up
Table was locked) into these registers to allow reading the contents of a locked look-up table. See section “MSL2021
Look-Up Table Lockout Procedure” on page 23 for details about locking the look-up table.
Table 13-8. Password Verification registers
(PWV(HIGH and PWV(LOW), 0x38 and 0x39), defaults highlighted
13.9 Look-Up Table Lock register (LUT LOCK, 0x3A)
Use this register to lock the look-up table of the MSL2021. See section “MSL2021 Look-Up Table Lockout Procedure” on
page 23 for details about locking the look-up table. At power-up, this register returns 0x02 when the look-up table is
locked, and returns 0x83 when the table is unlocked.
Table 13-9. Look-Up Table Lock register (LUT LOCK, 0x3A), defaults highlighted
13.10 Efficiency Optimizer Control Register (EOCTRL, 0x40)
Configures voltage feedback threshold for D. It is recommended that SLEEP = 1 (bit D0 in the configuration register
0x24) while changing this register to avoid perturbations of the string power supply. The MSL2021 always performs a
power supply voltage calibration when power is applied, EN is taken high, or SLEEP is reset to 0. Do not change bits D4
through D7.
DThresh sets the voltage feedback threshold for D, The Main string FET drain connection.
D Threshold = (DThresh 150mV) + 250mV.
Table 13-10. Efficiency Optimizer Control Register (FBOCTRL, 0x40), default highlighted
Register name Address
Register name
D7 D6 D5 D4 D3 D2 D1 D0
PWV(HIGH) 0x38 Password Verification High Byte [15:8]
PWV(LOW) 0x39 Password Verification Low Byte [7:0]
DEFAULT 111111 1 1
Register name Address
Register data
D7 D6 D5 D4 D3 D2 D1 D0
LUT LOCK 0x3A - - - - - -LOCK
DEFAULT 100000 1 1
Locks the Look-Up Table when committed to
EEPROM
000000 1 0
Register name
Address /
Default
Register data
D7 D6 D5 D4 D3 D2 D1 D0
FBOCTRL 0x40 - - - - DThresh[3:0]
DEFAULT = 0xE5 1 1 1 0 0 1 0 1
D Threshold = (0 150mV) + 250mV = 0.25V 1 1 1 0 0 0 0 0