FS23 datasheet(188/230 Pages) NXP

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NXP Semiconductors

FS23

Safety system basis chip (SBC) with power management, CAN FD and LIN transceivers

24.6 OTP_V1_CFG3

Bit

Write

Read

Reserved

V1_OCLS_

EN_OTP

BUCK_SC_OTP

Reset

Table 203. OTP_V1_CFG3 register bit allocation

Bit

Symbol

Description

Select BUCK slope compensation

010111 SC = 3275 mV/µs (recommended when Fsw = 2.25 MHz, LV1_buck = 4.7 µH and Vbuck = 3.3 V)

011100 SC = 2865 mV/µs (recommended when Fsw = 2.25 MHz, LV1_buck = 4.7 µH and Vbuck = 5 V)

100101 SC = 426 mV/µs (recommended when Fsw = 450 kHz, LV1_buck = 22 µH and Vbuck = 3.3 V)

101001 SC = 361 mV/µs (recommended when Fsw = 450 kHz, LV1_buck = 22 µH and Vbuck = 5 V)

0 to 5

BUCK_SC_OTP[1]

Reset on power-on reset

Enable BUCK low side overcurrent protection

0 Low side overcurrent protection is disabled

1 Low side overcurrent protection is enabled

V1_OCLS_EN_OTP

Reset on power-on reset

Table 204. OTP_V1_CFG3 register bit description

[1]

The slope compensation values are normalized for a typical V1_IN at 12 V.

24.7 OTP_V1_CFG4

Bit

Write

Read

Reserved

BUCK_PK_OC_PFM_OTP

BUCK_PFM_TOFF_OTP

BUCK_PFM_TON_OTP

Reset

Table 205. OTP_V1_CFG4 register bit allocation

Bit

Symbol

Description

Select BUCK TON time in PFM

00 TON time in PFM is 1021 ns (V1 = 5 V, freq = 450 kHz, V1_IN = 12 V)

01 TON time in PFM is 1272.5 ns (V1 = 5 V, freq = 450 kHz, V1_IN = 12 V)

10 TON time in PFM is 1632.5 ns (V1 = 5 V, freq = 450 kHz, V1_IN = 12 V)

11 TON time in PFM is 1772.5 ns (V1 = 5 V, freq = 450 kHz, V1_IN = 12 V)

0 to 1

BUCK_PFM_TON_OTP1

Reset on power-on reset

Select BUCK TOFF time in PFM

00 TOFF time in PFM is 605 ns (freq = 450 kHz)

01 TOFF time in PFM is 1170 ns (freq = 450 kHz)

10 TOFF time in PFM is 1725 ns (freq = 450 kHz)

11 TOFF time in PFM is 2285 ns (freq = 450 kHz)

2 to 3

BUCK_PFM_TOFF_OTP[1]

Reset on power-on reset

Table 206. OTP_V1_CFG4 register bit description

FS23

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Product data sheet

Rev. 7.0 — 16 October 2024

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