NCV7381ADP0R2G(2016) 데이터 시트보기 (PDF) - ON Semiconductor

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NCV7381ADP0R2G
(Rev.:2016)

FlexRay® Bus Driver

ON Semiconductor 

NCV7381

Internal Flags

The NCV7381 control logic uses a number of internal flags (i.e. one−bit memories) reflecting important conditions or events.

Table 3 summarizes the individual flags and the conditions that lead to a set or reset of the flags.

Table 3. INTERNAL FLAGS

Flag

Set Condition

Local

Wakeup

Low level detected on WAKE pin in a low−

power mode

Remote

Wakeup

Remote wakeup detected on the bus in a

low−power mode

Wakeup

Local Wakeup flag changes to set

or

Remote Wakeup flag changes to set

Power−on

Thermal

Warning

Internal power supply of the chip becomes

sufficient for the operation of the control logic

Junction temperature is higher than Tjw

(typ. 140°C) in a normal−power mode

and

VBAT is not in under−voltage

Thermal

Shutdown

Junction temperature is higher than Tjsd

(typ. 165°C) in a normal−power mode

and

VBAT is not in under−voltage

TxEN

Timeout

Bus Error

TxEN is Low for longer than dBDTxAct-

iveMax (typ. 1.5 ms) and bus driver is in

Normal mode

Transmitter is enabled

and

Data on bus are different from TxD signal

(sampled after each TXD edge)

VBAT Under− VBAT is below the under−voltage threshold

voltage

for longer than dBDUVVBAT

VCC Under− VCC is below the under−voltage threshold for

voltage

longer than dBDUVVCC

VIO Under−

voltage

VIO is below the under−voltage threshold for

longer than dUVIO

Error

Any of the following status bits is set:

• Bus error

• Thermal Warning

• Thermal Shutdown

• TxEN Timeout

• VBAT Under−voltage

• VCC Under−voltage

• VIO Under−voltage

Reset Condition

Low−power mode is entered

Low−power mode is entered

Normal mode is entered

or

Low−power mode is entered

or

Any under−voltage flag becomes set

Normal mode is entered

(Junction temperature is below Tjw in

a normal−power mode

or

the status register is read in a low−power

mode)

and

VBAT is not in under−voltage

Junction temperature is below Tjsd in

a normal−power mode

and

falling edge on TxEN

and

VBAT is not in under−voltage

TxEN is High or Normal mode is left

(Transmitter is enabled

and

Data on bus are identical to TxD signal)

or

Transmitter is disabled

VBAT is above the under−voltage threshold

for longer than dBDRVBAT

or

Wake flag becomes set

VCC is above the under−voltage threshold

for longer than dBDRVCC

or

Wake flag becomes set

VIO is above the under−voltage threshold for

longer than dBDRVIO

or

Wake flag becomes set

All of the following status bits are reset:

• Bus error

• Thermal Warning

• Thermal Shutdown

• TxEN Timeout

• VBAT Under−voltage

• VCC Under−voltage

• VIO Under−voltage

Comment

The thermal warning

flag has no influence

on the bus driver

function

The transmitter is

disabled as long as

the thermal shut-

down flag is set

The transmitter is

disabled as long as

the timeout flag is set

The bus error flag

has no influence on

the bus driver func-

tion

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