TLE7250V_15 Datasheet, PDF (10/34 Pages) Infineon Technologies AG – High Speed CAN-Transceiver

TLE7250VLE
TLE7250VSJ
Functional Description
4.2
Modes of Operation
The TLE7250V supports two different modes of operation, power-save mode and normal-operating mode while
the transceiver is supplied according to the specified functional range. The mode of operation is selected by the
NEN input pin (see Figure 4).
V_CC = “don’t care”
V_IO > V_IO(UV,R)
power-save mode
NEN = 1
NEN = 0
NEN = 1
V_CC > V_CC(UV,R)
V_IO > V_IO(UV,R)
normal-operating
mode
NEN = 0
Figure 4 Mode state diagram
4.2.1 Normal-operating Mode
In normal-operating mode the transmitter and the receiver of the HS CAN transceiver TLE7250V are active (see
Figure 1). The HS CAN transceiver sends the serial data stream on the TxD input pin to the CAN bus. The data
on the CAN bus is displayed at the RxD pin simultaneously. A logical “low” signal on the NEN pin selects the
normal-operating mode, while the transceiver is supplied by V_CC and V_IO (see Table 2 for details).
4.2.2 Power-save Mode
The power-save mode is an idle mode of the TLE7250V with optimized power consumption. In power-save mode
the transmitter and the normal-mode receiver are turned off. The TLE7250V can not send any data to the CAN
bus nor receive any data from the CAN bus.
The RxD output pin is permanently “high” in the power-save mode.
A logical “high” signal on the NEN pin selects the power-save mode, while the transceiver is supplied by the digital
supply V_IO (see Table 2 for details).
In power-save mode the bus input pins are not biased. Therefore the CANH and CANL input pins are floating and
the HS CAN bus interface has a high resistance.
The undervoltage detection on the transmitter supply V_CC is turned off, allowing to switch off the V_CC supply in
power-save mode.
Data Sheet
10
Rev. 1.0, 2015-08-12