Other Parts Discussed in Thread: IWR1843
Tool/software:
Dear Team,
My customer is using the LP87524JRNFTQ1 for powering the IWR1843AQGABL.
This time, they are considering to use the Spread-Spectrum Mode of the LP87524J-Q1 to reduce the EMI emissions radiated.
Then, they have some questions below.
Q1: Is there any document that compares the EMI reduction effect of the 4MHz fixed mode and the Spread-Spectrum Mode?
Q2: Can you please tell us the range of frequencies that are spread in the Spread-Spectrum Mode?
Q3: LP87524J-Q1 setting timing.
1. The IWR1843 start-up.
2. Set the following address for LP87524J-Q1 in I2C.
Address: 0x2B
PLL_MODE[1:0] : 0x2 ⇒ 0x0
Address: 0x2C
EN_SPREAD_SPEC: 0 ⇒ 1
Are there any restrictions on setting timing?
Until now, the LP87524J-Q1 has been used with the default value, but are there any functions that will be hindered by changing the above?
Best Regards,
Koshi Ninomiya