Datasheet

Data Sheet 8 Rev. 1.0, 2012-03-01
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
.
Figure 4 Modes of operation
The TLE7250G has 3 major modes of operation:
• Stand-by mode
• Normal-operating mode
• Receive-only mode
Table 2 Modes of Operation
Mode NRM NEN Bus Bias Comments
Normal-operating
mode
“high” “low”
V
CC
/2 The transmitter is active.
The receiver is active.
Stand-by “low”
or
“high”
“high” GND The transmitter is disabled.
The receiver is disabled.
Receive-only “low” “low”
V
CC
/2 The transmitter is disabled.
The receiver is active.
V
CC
off “low”
or
“high”
“low”
or
“high”
floating The transmitter is disabled.
The receiver is disabled.
NRM = 0
NEN = 0
NRM = 1
NEN = 0
undervoltage
detection on V
CC
power-down
V
CC
< V
CC(UV)
start–up
supply V
CC
NEN = 1
stand-by mode
NRM = 0/1
NEN = 0 NRM = 1 NEN = 0
receive-only mode
NRM = 0
NRM = 0
NEN = 0
NRM = 0/1
NEN = 1
NRM = 0/1
NEN = 1
NRM = 1
NEN = 0
normal-operating
mode