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Data Sheet

AD9554

Rev. D | Page 73 of 116

Address

Bits

Bit Name

Description

0x010D

[7:0]

Watchdog timer

Watchdog timer, Bits[7:0]. The watchdog timer stops when this register is written and

restarts on the next IO_UPDATE (Register 0x000F = 0x01). Default: 0x00 (0x0000 =

disabled). The units are in milliseconds.

0x010E

[7:0]

Watchdog timer, Bits[15:8]. The watchdog timer stops when this register is written and

restarts on the next IO_UPDATE (Register 0x000F = 0x01). Default: 0x00.

IRQ MASK (REGISTER 0x010F TO REGISTER 0x011F)

The IRQ mask register bits form a one-to-one correspondence with the bits of the IRQ monitor register (0x0D08 to 0x0D16). When set to

Logic 1, the IRQ mask bits enable the corresponding IRQ monitor bits to indicate an IRQ event. The default for all IRQ mask bits is

Logic 0, which prevents the IRQ monitor from detecting any internal interrupts.

Table 41. IRQ Mask for SYSCLK, Watchdog Timer, and EEPROM

Address

Bits

Bit Name

Description

0x010F

SYSCLK unlocked

Enables IRQ to indicate that the system clock has gone from locked to unlocked.

SYSCLK stable

Enables IRQ to indicate that the system clock has gone from unstable to stable.

SYSCLK locked

Enables IRQ to indicate that the system clock has gone from unlocked to locked.

SYSCLK calibration

ended

Enables IRQ to indicate that the system clock calibration sequence has ended.

SYSCLK calibration

started

Enables IRQ to indicate that the system clock calibration sequence has started.

Watchdog timer

Enables IRQ to indicate expiration of the watchdog timer.

EEPROM fault

Enables IRQ to indicate a fault during an EEPROM upload or download operation.

EEPROM complete

Enables IRQ to indicate successful completion of an EEPROM upload or download operation.

Table 42. IRQ Mask for Reference Inputs

Address

Bits

Bit Name

Description

0x0110

Reserved

Reserved.

REFB validated

Enables IRQ to indicate that REFB has been validated.

REFB fault cleared

Enables IRQ to indicate that REFB has been cleared of a previous fault.

REFB fault

Enables IRQ to indicate that REFB has been faulted.

Reserved

Reserved.

REFA validated

Enables IRQ to indicate that REFA has been validated.

REFA fault cleared

Enables IRQ to indicate that REFA has been cleared of a previous fault.

REFA fault

Enables IRQ to indicate that REFA has been faulted.

0x0111

Reserved

Reserved.

REFD validated

Enables IRQ to indicate that REFD has been validated.

REFD fault cleared

Enables IRQ to indicate that REFD has been cleared of a previous fault.

REFD fault

Enables IRQ to indicate that REFD has been faulted.

Reserved

Reserved.

REFC validated

Enables IRQ to indicate that REFC has been validated.

REFC fault cleared

Enables IRQ to indicate that REFC has been cleared of a previous fault.

REFC fault

Enables IRQ to indicate that REFC has been faulted.

AD9554 Datasheet(PDF) 73 Page - Analog Devices

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