TLE7250G_13 Datasheet, PDF (8/22 Pages) Infineon Technologies AG – High Speed CAN Transceiver

TLE7250G
Functional Description
4.2
Modes of Operation
Three different modes of operation are available on the TLE7250G. Each mode has specific characteristics in
terms of quiescent current or data transmission. NEN and NRM are used as the digital input pins for mode
selection. Figure 4 illustrates the different mode changes depending on the status of the NEN and NRM pins. After
supplying V_CC to the HS CAN transceiver, the TLE7250G starts in stand-by mode. The internal pull-up resistors
set the TLE7250G to stand-by mode by default. If the microcontroller is up and running, the TLE7250G can switch
to any mode of operation within the time period for mode change t_Mode.
undervoltage
detection on V_CC
V_CC < V_CC(UV)
start–up
supply V_CC
power-down
stand-by mode
NRM = 1
NEN = 0
NRM = 0/1
NEN = 1
normal-operating
mode
NEN = 1 NRM = 0/1
NRM = 0
NEN = 0
NRM = 0
NEN = 0
NRM = 0/1
NEN = 1
receive-only mode
NEN = 0
NRM = 1
NRM = 1
NEN = 0
Figure 4 Modes of operation
The TLE7250G has 3 major modes of operation:
• Stand-by mode
• Normal-operating mode
• Receive-only mode
NEN = 0
NRM = 0
Table 2 Modes of Operation
Mode
NRM NEN
Normal-operating “high” “low”
mode
Stand-by
“low” “high”
or
“high”
Receive-only
“low” “low”
V_CC off
“low” “low”
or
or
“high” “high”
Bus Bias
V_CC/2
GND
Comments
The transmitter is active.
The receiver is active.
The transmitter is disabled.
The receiver is disabled.
V_CC/2
floating
The transmitter is disabled.
The receiver is active.
The transmitter is disabled.
The receiver is disabled.
Data Sheet
8
Rev. 1.1, 2013-07-22