FS6407 datasheet(24/111 Pages) NXP

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NXP Semiconductors

FS6407/FS6408

5.9

CAN_5V voltage regulator

The CAN_5V voltage regulator is a linear regulator dedicated to the internal HSCAN interface. An external capacitor is required. Current

limitation, overvoltage, and undervoltage detectors are provided. If the internal CAN transceiver is not used, the CAN_5V regulator can

supply an external load (CAN_5V voltage regulator). CAN_5V is enabled by default.

5.10

Interrupt (INTB)

The INTB output pin generates a low pulse when an Interrupt condition occurs. The INTB behavior as well as the pulse duration are set

through the SPI during INIT phase. INTB has an internal pull-up resistor connected to VDDIO.

5.11

CANH, CANL, TXD, RXD

These are the pins of the high speed CAN physical interface. The CAN transceivers provides the physical interface between the CAN

protocol controller of an MCU and the physical dual wires CAN bus. The CAN interface is connected to the MCU via the RXD and TXD

pins.

5.11.1 TXD

TXD is the device input pin to control the CAN bus level. TXD is a digital input with an internal pull-up resistor connected to VDDIO. In the

application, this pin is connected to the microcontroller transmit pin.

In Normal mode, when TXD is high or floating, the CANH and CANL drivers are OFF, setting the bus in a recessive state. When TXD is

low, the CANH and CANL drivers are activated and the bus is set to a dominant state. TXD has a built-in timing protection that disables

the bus when TXD is dominant for more than TDOUT. In LPOFF mode, VDDIO is OFF, pulling down this pin to GND.

5.11.2 RXD

RXD is the bus output level report pin. In the application, this pin is connected to the microcontroller receive pin. In Normal mode, RXD is

a push-pull structure. When the bus is in a recessive state, RXD is high. When the bus is dominant, RXD is low. In LPOFF mode, this pin

is in high-impedance state.

5.11.3 CANH and CANL

These are the CAN bus pins. CANL is a low-side driver to GND, and CANH is a high-side driver to CAN_5V. In Normal mode and TXD

high, the CANH and CANL drivers are OFF, and the voltage at CANH and CANL is approximately 2.5 V, provided by the internal bus

biasing circuitry. When TXD is low, CANL is pulled to GND and CANH to CAN_5V, creating a differential voltage on the CAN bus.

In LPOFF mode, the CANH and CANL drivers are OFF, and these pins are pulled down to GND via the device RIN_CHCL resistors. CANH

and CANL have integrated ESD protection and extremely high robustness versus external disturbance, such as EMC and electrical

transients. These pins have current limitation and thermal protection.

5.12

Multiplexer output MUX_OUT

The MUX_OUT pin (Figure 7) delivers analog voltage to the MCU ADC input. The voltage to be delivered to MUX_OUT is selected via

the SPI, from one of the following parameters:

• Internal 2.5 V reference

• Die temperature sensor T(°C) = (VAMUX - VAMUX_TP) / VAMUX_TP_CO + 165

Voltage range at MUX_OUT is from GND to VDDIO (3.3 V or 5.0 V)

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