About VDDs of 52833

[HuiHuang]

 Hi ：

1. There  VDD1-VDD5   ， what is the difference   (function 、overflow capacity )?  

2. Do they (VDD1- VDD5) must  need  LDO  Power supply ？   can  DCDC supply for them ? ( with several shunt capacitors) ? 

3. 

• Case ID: 280783    not reponse for  if  52833 support for 2MHz  occupied bandwidth ，  can you check it again ?

THX

[ketiljo]

1. All VDD pins  must be externally connected. They are internally connected as well but the connection on the die isn't good enough to carry the current. 

2. Please refer to the reference schematic. https://infocenter.nordicsemi.com/topic/ps_nrf52833/ref_circuitry.html

3. The occupied bandwidth for a 2 Mbps BLE carrier is 2.1 MHz. For 1 Mbps and coded phy, it's ~1 MHz. Both S2 and S8 are using a 1 Mbps carrier. 

[HuiHuang]

1. All VDD pins  must be externally connected. They are internally connected as well but the connection on the die isn't good enough to carry the current.

RE:  it  means  no  difference ? 

2. Please refer to the reference schematic

RE： it didnot  show  what  type of power VDD_nRF is ， LDO must or, DCDC？ could you check it ? 

 3. The occupied bandwidth for a 2 Mbps BLE carrier is 2.1 MHz. For 1 Mbps and coded phy, it's ~1 MHz. Both S2 and S8 are using a 1 Mbps carrier. 

RE： coded phy  only  support in 1Mbps？  

          what kind of  application will use this function(coded) ?  (take example ? )

THX

[ketiljo]

HuiHuang said:

1. All VDD pins  must be externally connected. They are internally connected as well but the connection on the die isn't good enough to carry the current.

RE:  it  means  no  difference ? 

The voltage on all pins must be the same, yes.

HuiHuang said:

2. Please refer to the reference schematic

RE： it didnot  show  what  type of power VDD_nRF is ， LDO must or, DCDC？ could you check it ? 

As long as the voltage on the VDD pins is between 1.8 and 3.6 V, it doesn't matter if you supply it with a LDO or DCDC converter. In case you use a DCDC, make sure that the supply is properly filtered so any noise from the DCDC converter doesn't influence the radio.

HuiHuang said:

 3. The occupied bandwidth for a 2 Mbps BLE carrier is 2.1 MHz. For 1 Mbps and coded phy, it's ~1 MHz. Both S2 and S8 are using a 1 Mbps carrier. 

RE： coded phy  only  support in 1Mbps？  

          what kind of  application will use this function(coded) ?  (take example ? )

Coded PHY is using 1 Mbps modulation on air bit forward error correction is added so the sensitivity of the receiver is better. https://www.bluetooth.com/blog/exploring-bluetooth-5-going-the-distance/