Civil Engineering Reference
In-Depth Information
Fig. 2.58
Block diagram and pinning of TLE6250-G and TLE6250-GV33
• RxD: Receive data. Transform the differential signals from the bus into a local
signal for the microcontroller.
• RM: Receive only mode. In this mode, the transmitter is switched off.
• INH: Logic input pin to control the modes (standby mode and normal mode).
• CAN_H, CAN_L: Bus pins. High-voltage pins to transmit and receive data.
• V33V: To support the I/O pin (TxD, RM, INH and RxD) with the microcon-
troller.
2.6.2.2
Transmitter
High voltage robustness, high EMC immunity and high ESD robustness are the
requirements for the output stages CAN_H and CAN_L. At the same time, the
CAN_H and CAN_L output signals should be shaped very well to reduce the emis-
sion. This is done by the signal shaper in the transmitter. The output stage CAN_H
is a high-side switch and CAN_L is a low switch. Both stages switch on and off
together at the same time.
2.6.2.3
Receiver Block
The receiver transforms the bus differential signal into a logical signal for the mi-
crocontroller (on pin RxD); the common-mode range of this receiver is between
−20 V and + 25 V to allow a very high immunity against disturbances from the bus.
The high common-mode range also allows a high ground shift.
