Hi Nick,

Please see my response for question 2 and 6:

2 - It is ok to have a small gap between the board edge and the GND pour. Please make sure that the copper clearance area dimensions are met and there is no GND pour extending away after the edge of the module. 

6 - I am not sure how extending the BLE module further over the PCB edge would be better for the performance, in fact, extending the module may not be advisable as the pin 1 and 31 would not get good GND contact on the custom PCB.

Hi Poornima,

We do have a crystal recommendations for 39MHz crystal given under section 8.3 of AN0016.1 rev 1.33. 

However, you can use NX3225SA crystal for your application consisting of EFR32ZG14 as well.

The datasheet attached for JT2551T is pretty generic and hence do not have specific information to the 39MHz crystal. Hence I cannot provide any feedback on that specific crystal.

Please let us know if you have any further questions.

Hi Poornima,

We do have a crystal recommendations for 39MHz crystal given under section 8.3 of AN0016.1 rev 1.33. 

However, you can use NX3225SA crystal for your application consisting of EFR32ZG14 as well.

The datasheet attached for JT2551T is pretty generic and hence do not have specific information to the 39MHz crystal. Hence I cannot provide any feedback on that specific crystal.

Please let us know if you have any further questions.

Hello,

We do have crystal recommendations for 39MHz crystal given under section 8.3 of AN0016.1 rev 1.33. 

However, you can use NX3225SA crystal for your application consisting of EFR32ZG14 as well.

Please let us know if you have any further questions.

Hello,

We do have crystal recommendations for 39MHz crystal given under section 8.3 of AN0016.1 rev 1.33. 

However, you can use NX3225SA crystal for your application consisting of EFR32ZG14 as well.

Please let us know if you have any further questions.

At a high level, the EFR32 series 1 chip has two major blocks: MCU + Radio.

By default, most of the applications use EFR32 series 1 chip for both its MCU and radio functionality, but there are certain applications where the designer might want to use the EFR32 chip as an MCU only device i.e. without radio functionality. A reason for such usage would be due to some features that other MCUs might not have or to simply keep the application future proof with the possibility of wireless capability.

In the case where the radio is not used, special care needs to be taken to connect and configure the part properly. 
The table below provides a comparison of generic pin connections for the standard EFR32 with radio used versus the non-radio use case:

* Please note that even if the Radio block of the EFR32 chip is not used, DC voltage should be supplied at the appropriate power supply (PAVDD, RFVDD) pins along with the respective filtering components. A detailed pin connection and filtering component information are given in AN0002.1.

REMINDER:
The EFR32 Series 1 Supply constraints are as follows:-

• AVDD must be the highest voltage in the system
• VREGVDD must be connected to AVDD on DCDC-enabled devices
• AVDD >= DVDD
• AVDD >= PAVDD ( For 2.4GHz or Dual-band devices, PAVDD refers to the device pin. For sub-GHz devices, PAVDD refers to the external power amplifier supply)
• AVDD >= RFVDD
• AVDD >= IOVDD
• DVDD >= DECOUPLE

At a high level, the EFR32 series 1 chip has two major blocks: MCU + Radio.

By default, most of the applications use EFR32 series 1 chip for both its MCU and radio functionality, but there are certain applications where the designer might want to use the EFR32 chip as an MCU only device i.e. without radio functionality. A reason for such usage would be due to some features that other MCUs might not have or to simply keep the application future proof with the possibility of wireless capability.

In the case where the radio is not used, special care needs to be taken to connect and configure the part properly. 
The table below provides a comparison of generic pin connections for the standard EFR32 with radio used versus the non-radio use case:

* Please note that even if the Radio block of the EFR32 chip is not used, DC voltage should be supplied at the appropriate power supply (PAVDD, RFVDD) pins along with the respective filtering components. A detailed pin connection and filtering component information are given in AN0002.1.

REMINDER:
The EFR32 Series 1 Supply constraints are as follows:-

• AVDD must be the highest voltage in the system
• VREGVDD must be connected to AVDD on DCDC-enabled devices
• AVDD >= DVDD
• AVDD >= PAVDD ( For 2.4GHz or Dual-band devices, PAVDD refers to the device pin. For sub-GHz devices, PAVDD refers to the external power amplifier supply)
• AVDD >= RFVDD
• AVDD >= IOVDD
• DVDD >= DECOUPLE

At a high level, the EFR32 series 1 chip has two major blocks: MCU + Radio.

By default, most of the applications use EFR32 series 1 chip for both its MCU and radio functionality, but there are certain applications where the designer might want to use the EFR32 chip as an MCU only device i.e. without radio functionality. A reason for such usage would be due to some features that other MCUs might not have or to simply keep the application future proof with the possibility of wireless capability.

In the case where the radio is not used, special care needs to be taken to connect and configure the part properly. 
The table below provides a comparison of generic pin connections for the standard EFR32 with radio used versus the non-radio use case:

* Please note that even if the Radio block of the EFR32 chip is not used, DC voltage should be supplied at the appropriate power supply (PAVDD, RFVDD) pins along with the respective filtering components. A detailed pin connection and filtering component information are given in AN0002.1.

REMINDER:
The EFR32 Series 1 Supply constraints are as follows:-

• AVDD must be the highest voltage in the system
• VREGVDD must be connected to AVDD on DCDC-enabled devices
• AVDD >= DVDD
• AVDD >= PAVDD ( For 2.4GHz or Dual-band devices, PAVDD refers to the device pin. For sub-GHz devices, PAVDD refers to the external power amplifier supply)
• AVDD >= RFVDD
• AVDD >= IOVDD
• DVDD >= DECOUPLE

At a high level, the EFR32 series 1 chip has two major blocks: MCU + Radio.

By default, most of the applications use EFR32 series 1 chip for both its MCU and radio functionality, but there are certain applications where the designer might want to use the EFR32 chip as an MCU only device i.e. without radio functionality. A reason for such usage would be due to some features that other MCUs might not have or to simply keep the application future proof with the possibility of wireless capability.

In the case where the radio is not used, special care needs to be taken to connect and configure the part properly. 
The table below provides a comparison of generic pin connections for the standard EFR32 with radio used versus the non-radio use case:

* Please note that even if the Radio block of the EFR32 chip is not used, DC voltage should be supplied at the appropriate power supply (PAVDD, RFVDD) pins along with the respective filtering components. A detailed pin connection and filtering component information are given in AN0002.1.

REMINDER:
The EFR32 Series 1 Supply constraints are as follows:-

• AVDD must be the highest voltage in the system
• VREGVDD must be connected to AVDD on DCDC-enabled devices
• AVDD >= DVDD
• AVDD >= PAVDD ( For 2.4GHz or Dual-band devices, PAVDD refers to the device pin. For sub-GHz devices, PAVDD refers to the external power amplifier supply)
• AVDD >= RFVDD
• AVDD >= IOVDD
• DVDD >= DECOUPLE

At a high level, the EFR32 series 1 chip has two major blocks: MCU + Radio.

By default, most of the applications use EFR32 series 1 chip for both its MCU and radio functionality, but there are certain applications where the designer might want to use the EFR32 chip as an MCU only device i.e. without radio functionality. A reason for such usage would be due to some features that other MCUs might not have or to simply keep the application future proof with the possibility of wireless capability.

In the case where the radio is not used, special care needs to be taken to connect and configure the part properly. 
The table below provides a comparison of generic pin connections for the standard EFR32 with radio used versus the non-radio use case:

* Please note that even if the Radio block of the EFR32 chip is not used, DC voltage should be supplied at the appropriate power supply (PAVDD, RFVDD) pins along with the respective filtering components. A detailed pin connection and filtering component information are given in AN0002.1.

REMINDER:
The EFR32 Series 1 Supply constraints are as follows:-

• AVDD must be the highest voltage in the system
• VREGVDD must be connected to AVDD on DCDC-enabled devices
• AVDD >= DVDD
• AVDD >= PAVDD ( For 2.4GHz or Dual-band devices, PAVDD refers to the device pin. For sub-GHz devices, PAVDD refers to the external power amplifier supply)
• AVDD >= RFVDD
• AVDD >= IOVDD
• DVDD >= DECOUPLE