NCV7428D1L5R2G datasheet(9/19 Pages) ONSEMI

Part #	NCV7428D1L5R2G

Description	System Basis Chip with Integrated LIN and Voltage Regulator

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NCV7428

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Functional Description

VS Supply Input

VS pin of NCV7428 is typically connected to the car

battery through a reverse−protection diode and can be

exposed to all relevant automotive disturbances (ISO7637

pulses, system ESD ...). VS supplies mainly the integrated

LIN transceiver. Filtering capacitors should be connected

between VS and GND.

During power−up of the battery supply, VS pin must reach

VS_PORH level in order for the circuit to become functional

– the internal state machine is initiated and the VOUT

regulator is activated. The circuit remains functional until

VS falls back below VS_PORL level, when the device enters

the Shutdown mode.

VOUT Low−drop Voltage Regulator

The application low−voltage supply is provided by an

integrated low−drop voltage regulator delivering a 5 V or

3.3 V output VOUT. It is able to deliver up to 70 mA with

given precision and is primarily intended to supply the

application microcontroller unit (MCU) and related 5 V or

3.3 V loads (e.g. its own MCU−related digital inputs/

outputs). An external capacitor needs to be connected on

VOUT pin in order to ensure the regulator’s stability and to

filter the disturbances caused by the connected loads.

All low−voltage digital pins are related to VOUT.

LIN Transceiver

NCV7428 integrates on−chip LIN transceiver interface

between physical LIN bus and the LIN protocol controller.

This LIN physical layer is compatible to LIN2.x and

J2602 specifications.

NCV7428 LIN2.2 compliant physical layer can be

combined on the network with all previous LIN physical

layers.

NCV7428 LIN transceiver consists of a transmitter,

receiver and wakeup detector. The LIN transceiver can be

connected to the bus line via LIN pin, and to the digital

control through pins TxD and RxD. The functional mode of

the LIN transceiver depends on the operating mode and on

EN pin state – see Figure 3. The LIN transceiver is supplied

directly from the VS pin.

LIN Operating Modes

In LIN Active mode the transceiver can transmit and

receive data via LIN bus with speed up to 20 kBaud for

normal slope mode and 10 kBaud/s for low slope version.

The transmit data stream of the LIN protocol is present on

the TxD pin and converted by the transmitter into a LIN bus

signal with controlled slew rate to minimize EMC emission.

The receiver consists of the comparator that has a threshold

with hysteresis in respect to the supply voltage and an input

filter to remove bus noise. The LIN output is pulled HIGH

via an internal pull−up resistor (typ. 30 k

W). For master

applications, it is needed to put an external resistor (typ.

1k

W) with a serial diode between LIN and VS. The mode

selection is done by EN = High.

The transmission is only initiated with the TxD falling

edge in LIN Active mode. Entering this mode with TxD

already Low will not lead to transmitting bus Dominant

signal.

When leaving Normal mode (EN pin falling edge), the

transmitter is deactivated immediately.

The LIN Wakeup mode can be entered if the EN pin is

Low. The LIN receiver stays active to be able to detect a

remote wake−up via bus. The LIN transmitter is disabled

and the slave internal termination resistor of 30 k

W between

LIN and VS is disconnected in order to minimize current

consumption. Only a pull−up current source between Vs and

LIN is active. The valid LIN wakeup event causes driving

RxD Low until EN pin is pulled High.

A Wakeup pattern that is initiated in LIN Active mode and

ends in LIN Wakeup mode is also considered a valid Wakeup

event.

The LIN Wakeup mode is also forced if the device enters

to the Sleep operating mode.

The LIN Off mode provides extreme low current

consumption, LIN transceiver is fully deactivated. Pin RxD

stays High (as long as VOUT is provided) and logical level

on TxD is ignored.

The bus pin is internally pulled to VS with a current source

(thus limiting VS consumption in case of a permanent LIN

short to GND).

This mode is entered when NCV7428 is in Shutdown

mode (VS < VS_PORL) or in Thermal Shutdown mode (TJ >

TJ_SD).

Similar Part No. - NCV7428D1L5R2G

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ON Semiconductor	NCV7428D1L5R2G	182Kb / 19P	System Basis Chip with Integrated LIN and Voltage Regulator August, 2016 ??Rev. 5

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NCV7428D1L5R2G Datasheet(PDF) 9 Page - ON Semiconductor

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