tja1021 NXP Semiconductors, tja1021 Datasheet - Page 5

• Manufacturer Part Number: tja1021
• Description: Tja1021 Lin 2.0/sae J2602 Transceiver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
Table 4.
[1]
[2]
[3]
TJA1021_3
Product data sheet
Mode
Sleep
Standby
Normal mode
Power-on mode 0
Standby mode is entered automatically upon any local or remote wake-up event during sleep mode. Pin INH and the 30 k termination
resistor at pin LIN are switched on.
The internal wake-up source flag (set if a local wake-up did occur and fed to pin TXD) will be reset after a positive edge on pin SLP_N.
The wake-up interrupt (on pin RXD) is released after a positive edge on pin SLP_N.
[1]
Operating modes
SLP_N
0
0
1
Fig 3. State diagram
TXD (output)
weak pull-down
weak pull-down if
remote wake-up;
strong pull-down if
local wake-up
HIGH: recessive
state
LOW: dominant
state
weak pull-down
switching on V
TERM.: slave termination resistor, connected between pins LIN and V
BAT
TXD: weak pull-down
TERM. = high ohmic
[2]
TXD: weak pull-down
Transmitter: off
RXD: floating
INH: floating
TERM. = 30 k
Transmitter: off
RXD: floating
Power-on
Sleep
INH: high
RXD
floating
LOW
HIGH: recessive state
LOW: dominant state
floating
Rev. 03 — 8 October 2007
[3]
t
(SLP_N = 1)
> t
gotonorm
t
(WAKE_N = 0; after 1 0)
or t
t
(SLP_N = 1)
(LIN = 0 1; after LIN = 0)
INH
floating
HIGH
HIGH
HIGH
t
(SLP_N = 0)
> t
gotonorm
Transmitter
off
off
normal mode
off
> t
> t
RXD: receive data output
TXD: transmit data input
gotosleep
WAKE_N
> t
LIN 2.0/SAE J2602 transceiver
TERM. = 30 k
Transmitter: on
BUS
INH: high
Normal
BAT
Remarks
no wake-up request
detected
wake-up request
detected; in this mode the
microcontroller can read
the wake-up source:
remote or local wake-up
[2][3][4]
[5]
TXD: wake source output
.
t
(SLP_N = 1)
TERM. = 30 k
Transmitter: off
© NXP B.V. 2007. All rights reserved.
TJA1021
Standby
INH: high
RXD: low
> t
gotonorm
001aae073
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