TLE7250GVIO Datasheet, PDF (8/23 Pages) Infineon Technologies AG – High Speed CAN Transceiver

TLE7250GVIO
Functional Description
4.2
Modes of Operation
Two different modes of operation are available on the TLE7250GVIO. Each mode has specific characteristics in
terms of quiescent current or data transmission. The digital input pin NEN is used for mode selection. Figure 4
illustrates the different mode changes depending on the status of the NEN pin. After supplying V_CC and V_IO to the
HS CAN transceiver, the TLE7250GVIO starts in stand-by mode. The internal pull-up resistor at the NEN pin sets
the TLE7250GVIO to stand-by mode by default. If the microcontroller is up and running, the TLE7250GVIO can
switch to any mode of operation within the time period for mode change t_Mode.
V_CC < V_CC(UV)
undervoltage _{VIO < VIO(UV)}
detection on V_CC
and V_IO
start–up
supply V_CC
and V_IO
power-down
stand-by mode
NEN = 1
NEN = 0
NEN = 1
normal-operating
mode
NEN = 0
Figure 4 Modes of operation
The TLE7250GVIO has 2 major modes of operation:
• Stand-by mode
• Normal-operating mode
Table 2 Modes of Operation
Mode
NEN
Bus Bias
Normal-operating “low”
mode
V_CC/2
Stand-by
“high”
GND
V_CC off
“low”
or
“high”
floating
Comments
The transmitter is active.
The receiver is active.
The transmitter is disabled.
The receiver is disabled.
The transmitter is disabled.
The receiver is disabled.
Data Sheet
8
Rev. 1.0, 2012-03-14