NCV7383DB0R2G datasheet(6/21 Pages) ONSEMI

Part #	NCV7383DB0R2G

Description	FlexRay Bus Driver

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Manufacturer	ONSEMI [ON Semiconductor]

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NCV7383

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Table 3. INTERNAL FLAGS

Flag

Comment

Reset Condition

Set Condition

SPI Error

SPI error is detected:

Number of SCK falling edges

while CSN is Low is different from 16

or

SCK is not Low at CSN falling or rising

edge

CSN falling edge is detected

or

Track mode is entered

The status bits update is

discarded if SPI Error is

detected

Error

Any of the following flags is set:

• Bus error

• Thermal Shutdown

• TxEN Timeout

• VCC Under−voltage

• VIO Under−voltage

• SPI Error

All of the following Flags (Track mode)

or Status bits (Latched mode) are reset:

• Bus error

• Thermal Shutdown

• TxEN Timeout

• VCC Under−voltage

• VIO Under−voltage

• SPI Error

ERRN is set Low if Error

flag is set and STBN is

High

Internal Error Flag

There are two Error Signaling modes:

• Track mode − the common Error flag is reset when all

of the Error related flags are reset − Error flag is

directly visible on ERRN pin if STBN pin is High.

Minimum ERRN pin indication time is

dBDERRNSTABLE.

• Latched mode − the common Error flag is reset when

all of the related Status Bits are reset (requires

successful status Register read−out while all these flags

are reset). The common Error flag is visible on ERRN

pin if STBN pin is High and the particular flags are

accessible via SPI interface.

After Power−up the Error signaling is switched to the

Latched mode by default (internal Pull−Up on CSN pin).

When VIO is not in under−voltage Error indication Track

mode can be selected by host request (setting CSN pin Low

for longer than dERRNModeChange while SCK is set High

− see Figure 5), or simply by leaving CSN pin permanently

connected to GND and SCK pin permanently connected to

VIO. As soon as Error Indication Track mode is selected,

CSN pin internal Pull−Up is switched to Pull−Down

providing the CSN pin input current is reduced.

CSN

SCK

Error indication

Latched Mode

Error indication

Track Mode

dERRNModeChange

(Internal Pull−Up)

Error indication

Latched Mode

(Internal Pull−Up)

(Internal Pull−Down)

(Internal Pull−Up)

Don’t care

Figure 5. Timing Diagram of Error Indication Mode Control.

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