How to reset CC110L

Rakesh Kumar15

Other Parts Discussed in Thread: CC110L

Hi,

I am using below sequence to reset CC110L at power-up & also when I detect the IC is not in the expected state.

// Reset CC110L
PCSN=1;
__delay_ms(100);
PCSN=0;
__delay_us(40);
PCSN=1;
__delay_us(100);
PCSN=0;
while(PSI)
   {
   __delay_us(10);
   }

Sometime the IC is getting heated up ( it makes the whole board 35mmx70mm hot enough to touch).

Only solution to get out of state is to disconnect battery.

Kindly suggest the if this is known issue & how to resolve it.

Our production has stopped due to this.

Rakesh

over 8 years ago

0 TER over 8 years ago

TI__Guru**** 317180 points

This sounds like a ESD induced latch-up.

This post: indicate that you use an ESD diode but that this affects performance. Is this the same board?

0 Rakesh Kumar15 over 8 years ago in reply to TER

Prodigy 140 points

Yes This is the same board & I am using.

I have switched to different TVS diode as Infinion diode was degrading output power by 10-20dB.

Below is the part number for new diode: PolySurg 0603ESDA-TR1

Is there weakness in terms of latch-up on RF pin? Apart from TVS diode is there any other protection needed.

What about other I/O pins do they also need to be protected?

Also please confirm if the reset sequence I have put is correct or not:

// Reset CC110L
PCSN=1;
__delay_ms(100);
PCSN=0;
__delay_us(40);
PCSN=1;
__delay_us(100);
PCSN=0;
while(PSI)
{
__delay_us(10);
}

--
Rakesh

0 TER over 8 years ago in reply to Rakesh Kumar15

TI__Guru**** 317180 points

I can't see that you are issuing a SRES strobe?

0 Rakesh Kumar15 over 8 years ago in reply to TER

Prodigy 140 points

Hi,

I am using SRES strobe:

// Reset CC110L
PCSN=1;
__delay_ms(100);
PCSN=0;
__delay_us(40);
PCSN=1;
__delay_us(100);
PCSN=0;
while(PSI)
{
__delay_us(10);
}
spistrobe(0x30)

--
Rakesh

0 TA12012 over 8 years ago in reply to Rakesh Kumar15

TI__Mastermind 36375 points

That looks correct, but please add about 1ms delay after the reset for the CC110L to restart.

Regards,
/TA

0 Rakesh Kumar15 over 8 years ago in reply to TA12012

Prodigy 140 points

// I have modified as per your suggestion & other sources on internet:

// Reset CC110L
PCSN=1;
__delay_ms(100);
PCSN=0;
__delay_us(40);
PCSN=1;
__delay_us(100);
PCSN=0;
while(PSI)
   {
   __delay_us(10);
   }
temp=spiread(0x30,1);       // SRES command for reset
__delay_ms(10);

Rakesh

Sub-1 GHz

Sub-1 GHz forum

How to reset CC110L