MFS2301BMBACEP datasheet(101/230 Pages) NXP

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NXP Semiconductors

FS23

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

20.1.4 Electrical characteristics

TA = −40 °C to 125 °C, unless otherwise specified. VSUP = 5.5 V to 40 V, unless otherwise specified. VDDIO = 3.0 V to 5.5

V, unless otherwise specified. All voltages referenced to ground.

Symbol

Parameter

Min

Typ

Max

Unit

I2C

3.135

3.300

3.465

VDDIO

I2C interface supply input

4.75

5.00

5.25

FSCL

SCL clock frequency (max load cap = 100 pF)

MHz

I2CVIL

SCL, SDA low-level input voltage

0.3 x VDDIO

I2CVIH

SCL, SDA high-level input voltage

0.7 x VDDIO

I2CHYST

Input hysteresis

170

SDAVOL

Low-level output voltage at SDA pin (I = 20 mA)

0.4

CI2C

Input capacitance at SCL/SDA

tSPSCL

SCL pulse width filtering time

tSPSDA

SDA pulse width filtering time

Table 66. Electrical characteristics

20.2 SPI communication

The FS23 provides a 32-bit SPI interface, as alternative to the I2C interface (SPI_EN_OTP = 1).

20.2.1 SPI interface overview

The SPI has the following arrangement:

MOSI bits

• Bits 31 to 25: register address

• Bit 24: Read/Write (for reading Bit 24 = 0; For writing Bit 24 = 1)

• Bits 23 to 8: control bits

• Bits 7 to 0: CRC

MISO bits

• Bits 31 to 24: general device status

• Bits 23 to 8: device internal control register content

• Bits 7 to 0: CRC

The digital SPI pins (CSB, SCLK, MOSI, MISO) are referenced to VDDIO.

The MCU is the master driving MOSI and FS23 is the slave driving MISO. The MISO data is latched at the

SCLK rising edge and MOSI data is latched at the SCLK falling edge. MSB first.

• In write command, MISO [31:24] bits are the general status flags, [23:8] bits are register’s content before

Write access and MISO [7:0] is the CRC of the message sent by the FS23.

• In read command, MOSI [23:8] bits are all 0 and MOSI [7:0] is the CRC of the message sent by the MCU.

Table 67 and Table 68 describe SPI communication protocol for writing data into the FS23 or reading data from

the FS23.

FS23

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

Product data sheet

Rev. 7.0 — 16 October 2024

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