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Member #424122

Member Since: March 30, 2013

Country: United States

  • Thanks for sharing the app note here. It really helped in understanding the concept behind logic converter.

  • I am trying to interface the MPR121 with 5v 8051 micro controller. I have also purchased the logic level converter. Should i used pull up resistors for the IRQ pin even if i use a logic level converter ?

  • I am trying to interface the MPR121 with 5v 8051 micro controller. I have also purchased the logic level converter. Should i used pull up resistors for the IRQ pin even if i use a logic level converter ?

  • I am trying to interface the MPR121 with 5v 8051 micro controller. I have also purchased the logic level converter. Should i used pull up resistors for the IRQ pin even if i use a logic level converter ?

  • @Mike Grusin: Thank you, as per your suggestions I was able to change the baud rate at which this device communicates before de-soldering it.

  • @ MikeGrusin : Thanks for patiently replying back. One last query. Since I am now directly connecting my micro controller to the GSM module, should the baud rate at which i transfer serially to UART0 should be still 115200 as per the datasheet or can i make it 9600.

  • I think i found the answer. To power up my board , i should connect a 9v dc input at the RAW pin instead of the Vcc pin. Vcc pin is output whose value is 3.8v as per the schematic.

    To connect my eval board to my micro controller it would be sufficient if i just connect the Tx & Rx of 8051 with Rx & Tx of my eval board respectively.

    Is that correct?

  • @ MikeGrusin : Thanks for the prompt reply. I don’t intend to connect the eval board with a PC using USB,rather i want to connect it with the Micro controller directly. Could I use the Vcc pin to power up the board by connecting it to an output of an external regulator or only the 12V DC adapter should be used to power up the board? Just like in SM5100B eval board, are there any jumpers which must be cleared to use this eval board directly connected to a Micro controller?

  • The Rx, Tx pins in Evaluation board correspond to pins for either UART0 or UART1 ? What is the need for pins 5V, 3.3V and 1.8 V? I could not find the description for these pins in application notes nor in the datasheet.

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