blue PiraT Mini
User Guide
Datum: 14.12.2018
Seite 32 von 60
blue_PiraT_Mini_UserManual_V3.4.1.doc
11 Interfaces
The different interfaces of the blue PiraT Mini supported bus systems are described in this chap-
ter in more detail.
11.1 CAN
The blue PiraT Mini is able to record data in compliance with the CAN specification 2.0a (11 Bit
identifier) and 2.0b (29 Bit identifier).
11.1.1
CAN data with 29 Bit identifiers
The bl
ue PiraT Mini can also log CAN data with 29 Bit identifiers. You don’t have to configure
anything. All the CAN data will be logged as they are available on the CAN bus. It is also possi-
ble to log CAN messages mixed with
CAN specification 2.0a (11 Bit)
and
CAN specification
2.0b (29 Bit)
identifiers.
11.1.2
Operating modes High Speed / Low Speed / CAN FD
Depending on the model, the blue PiraT Mini has different numbers of High Speed (HS), Low
Speed (LS) CAN or CAN FD interfaces. It is not possible to change a CAN interface. Each type
is using different transceivers.
The electrical behavior of the Low Speed and the High Speed CAN is different, hence, the Low
Speed CAN port of the blue PiraT Mini must not be connected to a High Speed CAN bus and
vice versa.
Both operating modes use differential signals (CANH, CANL). For the correct data recording, all
nodes of the bus must have a common reference potential. The blue PiraT Mini uses the con-
nection “
clamp 31
” as a reference potential. The lines of the High Speed CANs are terminated
with a high resistance.
Low Speed CAN
High Speed CAN
CAN FD
Transceiver chip
Philips
NXP 1055
Philips
NXP TJA1041
NXP
TJA1044GT
Terminating resistor
4k64
10k
4k64
Baud rate
– data channel
50 kbit/s - 125 kbit/s
50 kbit/s - 1 Mbit/s
50kbit/s
– 5Mbit/s
Baud rate
– control channel
-
-
50kbit/s
– 1Mbit/s
Supported identifiers (SW)
11 and 29 Bit
11 and 29 Bit
11 and 29 Bit
Disabling acknowledge
possible
possible
possible
Time stamps
at the end of the
telegram
at the end of the
telegram
at the end of the
telegram
Table 11.1: CAN
