MFS2401AVBA0ES datasheet(43/151 Pages) NXP

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NXP Semiconductors

FS2400

Fail-safe system basis chip with SMPS and LDO, CAN FD transceiver

16 I/O interface pins

16.1 WAKE2/HID0, WAKE3/HID1

WAKEx/HIDx pin has two different roles. It can be used either as a wake-up pin or as hardware ID detection pin.

aaa-046845

Control

lPD_HID

lPU_HID

RPD_WAKE

RPU_WAKE

GND

SPI

WK pin

status

VSUP

WAKEx/HIDx

Figure 27. WAKEx/HIDx diagram

16.1.1 WAKE feature

WAKEx/HIDx pins are high-voltage inputs used as wake-up sources for the device.

WAKE2 and WAKE3 are wake-up input signals with analog measurement capability through AMUX. WAKE2

can be, for example, connected to a switched VBAT and WAKE3 to the wake-up output of a CAN or FlexRay

transceiver. When a WAKE pin is used as a global pin, an R - C protection is required.

In Normal mode, any event on the WAKE2 or WAKE3 pins generates a flag (WKx_I), when not masked

(WKx_M). In Low-power modes, a wake-up event can be generated on high or low level depending on

WKx_WUCFG[1:0] bits.

Wake-up filtering time is configurable by SPI using WKx_DGLT bits. Internal pulldown and pullup resistors can

be enabled, disabled, or configured as cell repeater, as per WKxPUPD_OTP[1:0] bits.

Note: Cell repeater configuration is used to reduce the current consumption. In this configuration, the pullup or

pulldown selection follows the state of the internal buffer output after filtering. If the buffer output is low, pulldown

resistor is selected. If the buffer output is high, the pullup resistor is selected.

16.1.2 Hardware ID feature

Hardware ID feature comes on top of WAKE 2 pin and WAKE 3 pin to allow electronic control unit (ECU)

location in the car based on WAKEx/HIDx pins hardware connection.

The WAKEx/HIDx pin state can be:

• Connected to VBAT

• Connected to GND

• Open

Using the two WAKEx/HIDx pins allows up to nine different hardware ID combinations.

FS2400

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

Product data sheet

Rev. 4 — 23 October 2024

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