IFX1040SJ Infineon Technologies, IFX1040SJ Datasheet - Page 7

• Manufacturer Part Number: IFX1040SJ
• Manufacturer: Infineon Technologies

Specifications of IFX1040SJ

• Packages: PG-DSO-8
• Transmission Ratemax: 1.0 Mbit/s
• Bus Wake-up Capability: Yes
• Additional Features: STB, WK, SPLIT
• Wake-up Inputs: Bus wake-up
• Standards: ISO 11898-2/ISO11898-5

TxD Time-out Feature
If the TxD signal is dominant for a time t > t
This is realized to prevent the bus from being blocked permanently dominant due to an error like in case of a
malfunctioning microcontroller.
The transmission is released again, after a rising edge at TxD has been detected.
As a result of the TxD Time-Out function, the minimum bit rate is limited. The minimum achievable bit rate can be
calculated by the maximum number of consecutive dominant bits allowed in the system. It is given by the
maximum number of dominant bits allowed in the system divided by the TxD permanent dominant disable time
t_TxD.
Reduced Electromagnetic Emission
The bus driver has an implemented control to reduce the electromagnetic emission (EME). This is achieved by
controlling the symmetry of the slope, resp. of CANH and CANL.
Overtemperature
The driver stages are protected against overtemperature. Exceeding the shutdown temperature results in
deactivation of the driving stages at CANH/L. To avoid a bit failure after cooling down, the signals can be
transmitted again only after a dominant to recessive edge at TxD.
Figure 4
condition causes the transmission stage to deactivate. After the over temperature condition is no longer present,
the transmission is only possible after the TxD signal has changed to recessive level.
Figure 4
Reception
The analog CAN bus signals are converted into a digital signal at RxD via the differential input receiver. The RxD
signal is switched to RxD output pin via the multiplexer (MUX), see
In normal mode the split pin is used to stabilize the recessive common mode signal.
Data Sheet
BUS
shows the way how the transmission stage is deactivated and activated again. First an over temperature
(CANH-CANL)
Overtemp
Failure
Release of the Transmission after Overtemperature
V
GND
GND
TxD
DIFF
V
V
CC
CC
TxD
Overtemperature
the TxD time-out function deactivates the transmitter of the IFX1040.
R
7
Figure
2.
D
Application Information
Rev. 1.0, 2011-11-4
R
IFX1040
t
t
t