TLE6258-2 Datasheet, PDF (6/15 Pages) Infineon Technologies AG – LIN Transceiver

TLE 6258-2
Application Information
Normal Mode
ENN
V_CC
Low ON
Start Up
Power Up
ENN
Low
ENN
High
ENN
Low
Power-Up
ENN
High
RxD V_CC
Low ¹⁾ _{ON or}
High ³⁾ _Off
Stand-by Mode
ENN
High
V_CC
ON or
Off
Wake Up
t > t_WAKE
1) After wake-up via bus
3) After start up, V_CC ON
TOAEA03451_1.VSD
Figure 3 State Diagram
For fail safe reasons the TLE 6258-2 has already a pull-up resistor of 30 kΩ
implemented. To achieve the required timings for the dominant to recessive transition of
the bus signal an additional external termination resistor of 1 kΩ is required. It is
recommended to place this resistor in the master node. To avoid reverse currents from
the bus line into the battery supply line in case of an unpowered node, it is recommended
to place a diode in series to the external pull-up. For small systems (low bus capacitance)
the EMC performance of the system is supported by an additional capacitor of at least
1 nF in the master node (see Figure 6).
In order to reduce the current consumption the TLE 6258-2 offers a stand-by mode. This
mode is selected by switching the Enable Not (ENN) input high (see Figure 3). In the
stand-by mode a wake-up caused by a message on the bus is indicated by setting the
RxD output low. When entering the normal mode this wake-up flag is reset and the RxD
output is released to transmit the bus data.
Data Sheet
6
Rev. 2.0, 2005-01-13