ADP1050ACPZ-R7 datasheet(25/93 Pages) AD

25 / 93 page

ADP1050

Data Sheet

To minimize trace length, the proper amount of decoupling

capacitance must be placed between the VDD pin (Pin 16) and the

AGND pin (Pin 17), as close as possible to the device. The same

requirement applies to the VCORE pin (Pin 15). It is recommended

that the VCORE pin not be used as a reference or to generate

other logic levels using resistive dividers.

CHIP PASSWORD

On power-up, some registers in the ADP1050 are locked and

protected from being written to or read from. When the chip is

locked, the following commands and all read only registers are

accessible:

•

Operation

•

ON_OFF_CONFIG

•

CLEAR_FAULTS

•

WRITE_PROTECT

•

RESTORE_DEFAULT_ALL

•

VOUT_COMMAND

•

VOUT_TRIM

•

VOUT_CAL_OFFSET

Unlock the Chip Password

To unlock the chip password, perform two consecutive writes

with the correct password (default value = 0xFFFF) using the

CHIP_PASSWORD command (Register 0xD7). Between the two

write actions, any read or write action to another register in this

device interrupts the unlocking of the chip password. The

CHIP_PASSWORD_UNLOCKED flag (Register 0xFEA0[7])

is set to indicate that the chip password is unlocked for access.

Lock the Chip Password

To lock the chip password, use the CHIP_PASSWORD command

(Register 0xD7) to write any value other than the correct password.

The CHIP_PASSWORD_UNLOCKED flag (Register 0xFEA0[7])

is then cleared to indicate that the chip password is locked from

access.

Change the Chip Password

To change the chip password, first write the old password using the

CHIP_PASSWORD command (Register 0xD7). Next, write the

new password using the same command. The chip password is

changed to the new password. If the chip password is to be changed

permanently, the register contents must be saved in the EEPROM

after the chip password is changed. If the correct chip password is

lost, the RESTORE_DEFAULT_ALL command (Register 0x12)

restores the factory default settings. In this case, all the user settings

are reset.

Rev. A | Page 24 of 92

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