FS5502 datasheet(73/113 Pages) NXP

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NXP Semiconductors

FS5502

High voltage PMIC with multiple SMPS and LDO

CLK_TUNE [3:0]

Oscillator frequency [MHz]

0000 (default)

0001

0010

0011

0100

1001

1010

1011

1100

Reset condition

POR

Table 67. Manual frequency tuning configuration

18.4 Spread spectrum

The internal oscillator can be modulated with a triangular carrier frequency of 23 kHz or

94 kHz with ±5 % deviation range around the oscillator frequency. The spread spectrum

feature can be activated by I2C with the MOD_EN bit and the carrier frequency can be

selected by I2C with the MOD_CONF bit. By default, the spread spectrum is disabled.

The spread spectrum and the manual frequency tuning functions cannot be used at the

same time.

The main purpose of the spread spectrum is to improve the EMC performance by

spreading the energy of the internal oscillator and VPRE frequency on VBAT frequency

spectrum. Consequently, it is recommended to select 23 kHz carrier frequency when

VPRE is configured at 455 kHz and 94 kHz when VPRE is configured at 2.2 MHz for the

best performance.

18.5 External clock synchronization

To synchronize the switching regulators with an external frequency coming from FIN

pin, the PLL shall be enabled with OTP_PLL_SEL bit. The FIN pin accepts two ranges

of frequency depending on the divider selection to always have CLK clock at the output

of the PLL in the working range of the digital blocks from 16 MHz to 24 MHz. When

FIN_DIV = 0, the input frequency range must be between 333 kHz and 500 kHz. When

FIN_DIV = 1, the input frequency range must be between 2.0 MHz and 3.0 MHz.

After the FIN clock divider configuration with FIN_DIV bit, the FIN clock is routed to the

PLL input with EXT_FIN_SEL bit. The CLK clock changes from the internal oscillator to

FIN external clock with EXT_FIN_SEL bit. So, the configuration procedure is FIN_DIV

first, then apply FIN and finally set EXT_FIN_SEL.

If FIN is out of range, CLK clock moves back to the internal oscillator and reports

the error using the CLK_FIN_DIV_OK bit. When FIN comes back in the range, the

configuration procedure described above is executed again.

The FOUT pin can be used to synchronize an external device with the FS5502. The

frequency sent to FOUT is selected by I2C with the FOUT_MUX_SEL [3:0] bits.

FS5502

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

Product data sheet

Rev. 4 — 27 October 2021

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