Hi,
My customers have questions about the EN/EN2 pins of the TRF7962A.
Now customer's design is
EN---VDD_X (1kΩ pull-up)
EN2 ---GND (1kΩ pull-down)
Due to this connection, the IC may enter power-down mode and not work.
Customers suspected that the EN pin was misconnected, so EN pin connected to the power supply same as the VIN.
Then the IC is working properly.
I'm guessing this problem is probably because the EN/EN2 pin mode was determined before the VDD_X internal regulator worked.
Question 1:
Is the above guess correct?
Question 2:
Is it correct to connect the EN pin to the VIN power supply if the EN pin is not controlled by the MCU?
Question 3:
Customer's design, ASK/OOK(12) pin also connect to the VDD_X.
If ASK/OOK is not controlled by the MCU, is it correct to connect to the VIN?
Customers have products that have been sold for several years with this wrong design.
But so far, this problem has not occurred.
Question 4:
Why is it in Standby mode even if the EN pin is connected to VDD_X?
Customers found this design problem and needs to redesign it.
However, they need to explain to END-User why it worked correctly until now.
I’d like to ask you for your help on this problem...
Best regards,
Rei
