7.3.10.3 INT_N (Interrupt)

The LOCK_N pin can be configured to indicate an INT_N (Interrupt) event. When configured as an INT_N output, the pin asserts low when an interrupt occurs, according to the programmed interrupt masks. Seven separate masks can be programmed via register control as interrupt sources:

• If there is a Loss of Signal (LOS) event on IN0, irrespective of the input channel selected (2 separate masks).
• If there is a Loss of Signal (LOS) event on IN1, irrespective of the input channel selected (2 separate masks).
• If HEO or VEO falls below a certain threshold after CDR is locked (1 mask).
• If a CDR Lock event has occurred (2 separate masks).

INT_N is a sticky bit, meaning that it will flag after an interrupt occurs and will not clear until read back. Once the Interrupt Status Register is read, the INT_N pin will assert high again. For more information about how to configure the LOCK_N pin for INT_N functionality, refer to the LMH1219 Register Map and the Programming Guide.