TJA1085 데이터 시트보기 (PDF) - NXP Semiconductors.

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TJA1085

FlexRay active star coupler

NXP Semiconductors. 

NXP Semiconductors

TJA1085

FlexRay active star coupler

Vdif

+2000

130 ns

870 ns 870 ns

wake-up

0V

-2000

770 870 870

ns ns ns

130 130

ns ns

5 µs

5 µs

5 µs

Fig 4.

The duration of each interruption is 130 ns.

The transition time from DATA_0 to DATA_1 and vice versa is about 20 ns.

The TJA1085 wake-up flag is set on receipt of the following frame payload:

0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00,

0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00,

0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00,

0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF

Minimum bus pattern for bus wake-up via dedicated FlexRay data frame

5 µs

015aaa343

6.4.2 Local wake-up via pin LWU

Local wake-up is detected when the voltage on pin LWU is lower than Vth(wake)(LWU) for

longer than tdet(wake)(LWU) (falling edge on pin LWU). When local wake-up is detected, the

WU_LOCAL status bit is set and a WU interrupt is generated. At the same time, the

internal biasing of this pin is switched to pull-down.

If the voltage on pin LWU rises and remains above Vth(wake)(LWU) for longer than

tdet(wake)(LWU) (rising edge on pin LWU), local wake-up is not detected and the biasing on

pin LWU is switched to pull-up.

pull-up

pull-down

pull-up

LWU

VBAT

0V

tdet(wake)(LWU)

VBAT

INH

0V

Fig 5. Local wake-up timing on pin LWU

tdet(wake)(LWU)

td(LWUwake-INHH)

015aaa178

6.4.3 Wake-up via the TRXD0/1 interface

If the voltage on pin TRXD0 or pin TRXD1 is LOW for longer than tdet(wake)(TRXD), a WU

interrupt is generated and the WU_TRXD status bit is set.

TJA1085

Product data sheet

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

Rev. 1 — 23 October 2012

© NXP B.V. 2012. All rights reserved.

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