tja1041 NXP Semiconductors, tja1041 Datasheet - Page 5

• Manufacturer Part Number: tja1041
• Description: High Speed Can Transceiver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
7. Functional description
TJA1041_6
Product data sheet
7.1 Operating modes
The primary function of a CAN transceiver is to provide the CAN physical layer as
described in the ISO 11898 standard. In the TJA1041 this primary function is
complemented with a number of operating modes, fail-safe features and diagnosis
features, which offer enhanced system reliability and advanced power management
functionality.
The TJA1041 can be operated in five modes, each with specific features. Control pins
STB and EN select the operating mode. Changing between modes also gives access to a
number of diagnostics flags, available via pin ERR. The following sections describe the
five operating modes.
illustrates the mode transitions when V
Table 4.
[1]
[2]
[3]
[4]
[5]
Control pins
STB
X
L
L
H
H
X = don’t care.
Setting the pwon flag or the wake-up flag will clear the UV
The transceiver directly enters Sleep mode and pin INH is set floating when the UV
the undervoltage detection time on either V
When go-to-sleep command mode is selected for longer than the minimum hold time of the go-to-sleep
command, the transceiver will enter Sleep mode and pin INH is set floating.
On entering normal mode the pwon flag and the wake-up flag will be cleared.
EN
X
L
H
L
H
Operating mode selection
Internal flags
UV
set
cleared
cleared
cleared
cleared
cleared
NOM
Rev. 06 — 5 December 2007
Table 4
UV
X
set
cleared
cleared
cleared
cleared
BAT
shows the conditions for selecting these modes.
[1]
pwon;
wake-up
X
one or both set Standby mode
both cleared
one or both set Standby mode
both cleared
one or both set Standby mode
both cleared
X
X
[2]
CC
CC
, V
or V
I/O
I/O
has elapsed before that voltage level has recovered).
and V
NOM
Operating mode
Sleep mode
no change from Sleep mode
Standby mode from any
other mode
no change from Sleep mode
Standby mode from any
other mode
no change from Sleep mode
go-to-sleep command mode
from any other mode
pwon/listen-only mode
normal mode
BAT
flag.
are present.
High speed CAN transceiver
[3]
[5]
[4]
NOM
© NXP B.V. 2007. All rights reserved.
TJA1041
flag is set (so after
Figure 3
Pin INH
floating
H
floating
H
H
floating
H
H
floating
H
H
H
[4]
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