MPF0900AMBA2ES datasheet(136/205 Pages) NXP

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NXP Semiconductors

PF09

Nine-channel power management IC with advanced system safety monitoring

CLK_FREQ[3:0]

High-frequency clock [MHz]

Switching regulator frequency [MHz]

0000

16.0

2.000

0001

17.0

2.125

0010

18.0

2.250

0011

19.0

2.375

0100

20.0

2.500

0101

21.0

2.625

0110

22.0

2.750

0111

23.0

2.875

1000

24.0

3.000

1001 - 1111

Reserved

Table 181. Manual frequency tuning

The default operating frequency is set in the OTP registers via the OTP_CLK_FREQ[3:0] bits.

A FREQ_RDY_I interrupt is provided to indicate the frequency has reached the selected target frequency. The

frequency-ready interrupt will assert the INTB pin when the interrupt is not masked.

13.4.1.2 Spread spectrum

The internal oscillator features a selectable frequency spread spectrum with +/-10 % wide-frequency spread to

help manage EMC in the automotive applications. When the frequency spread-spectrum feature is enabled, the

switching regulators are expected to be set in PWM, to take full advantage of the frequency spreading in the

switching node.

Frequency spread spectrum is available only when the device is set to generate the switching frequency from

the internal frequency clock, and it will be disabled when the external clock synchronization is enabled.

The default enable condition of the spread spectrum is set in the OTP registers via the OTP_FSS_EN bit, and

the MCU can enable or disable the spread spectrum during the SYSTEM ON states using the FSS_EN bit.

FSS_EN

Frequency spread spectrum

Disabled

Enabled

Table 182. Frequency spread spectrum enable bit

When spread spectrum is enabled, the device uses the CLK_FREQ[3:0] bits to select the center frequency for

spread spectrum with the following settings:

CLK_FREQ[3:0]

Center frequency with 10% spread spectrum (MHz)

0000

18.0

0001

18.0

0010

18.0

0011

19.0

0100

20.0

0101

21.0

Table 183. Frequency spread spectrum center frequency selection bits

PF09

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 1.3 — 16 December 2025

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