[ADV7281-M] Manually trigger interrupt pin INTRQ

Question

Hi all, 
 I want to trigger the interrupt pin (INTRQ) 
 I tried to achieve this by using the manual interrupt, using the following sequence for I2C address 0x42: 
 
 Enter Interrupt sub map register space [Write 0x20 to Addr 0x0E] 
 Set Interrupt configuration 1 (active low, manual intr enabled, active until cleared) [Write 0xD5 to Addr 0x40] 
 Set Interrupt mask 2 to unmasks manual interrupt [Write 0x80 to Addr 0x48] 
 Clear interrupt status for manual interrupt [Write 0x80 to Addr 0x47] 
 
 So as you can see, the manual interrupt is successfully triggered based on interrupt status register (Addr 0x46). However, there is no change in signal at INTRQ pin. It remains HIGH (1) all the time from the start of the sequence until the end. 
 
 Hope someone can help me on this matter. Thanks in advance!

PoornimaSubramani · Answer

Hi, 
 If it is an custom system then make sure that there are no strong pull-up on the line or that the backend processor is not somehow preventing the interrupt pin driving low, if there is no crystal input connected, then the INTRQ pin remaining high is expected behavior (especially if there is a pull-up resistor on this line). 
 Latest Script file is located here:Please refer section ##08_Program Interrupts## of the latest script file (right at the bottom). 
 https://ez.analog.com/servlet/JiveServlet/download/2633-26-29880/ADV7182CUST-VER.5.0.txt.zip 
 Refer this FAQ How to activate the INTRQ interrupt pin on the ADV7180 
 Thanks, 
 Poornima

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[ADV7281-M] Manually trigger interrupt pin INTRQ

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