DS90UB949-Q1: REM_INTB and INT_B application

Betty Guo

Hi team,

for UB949 REM_INTB and INTB, what's the difference between them? In the datasheet, only say the that Remote interrupt. Mirrors status of INTB_IN from the deserializer. Note: External pullup to 1.8 V required. Recommended pullup: 4.7 kΩ

for the INTB, also say it is remote interrupt. I know if use INTB, need read reg C7 to clear it, while use REM_INTB, it not need be clear. any others?

can I understand that INTB can be used as local and remote slave status, but the REM_INTB only for remote.?

if we use REM_INTB, can we left INT_B float, or need pull up to 1.8V. Can we connect the INTB and REM_INTB together?

thank you

over 5 years ago

0 Aaron Heng over 5 years ago

TI__Mastermind 40150 points

Hi Betty,

Both of these pins are output signal. The INTB be used for local or remote event where REM_INTB is mirroring the signal from the deserializer. The REM_INTB is configured it will propagate the pair with deserializer of INTB_IN.

The INTB is an open drain output pin; therefore, a pull-up resistor is required. For REM_INTB, you do not need pull-up resistor.

Hope this helps. Let me know if you have any questions.

Aaron

0 Betty Guo over 5 years ago in reply to Aaron Heng

TI__Expert 7300 points

Hi Aaron,

so, we can use REM_INTB to monitor the INT_IN of 948 without any reg configuration? as long as the Ser and Deser are linked, the REM_INTB can be mapped with INT_IN automaticly? right

0 Casey McCrea over 5 years ago in reply to Betty Guo

TI__Guru** 103215 points

Yes correct

Best Regards,

Casey

0 Betty Guo over 5 years ago in reply to Casey McCrea

TI__Expert 7300 points

many thanks Casey!

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DS90UB949-Q1: REM_INTB and INT_B application