TLE6259-2 Datasheet, PDF (5/18 Pages) Infineon Technologies AG – Single-Wire-Transceiver

Final Datasheet TLE 6259-2
1.5 Application Information
Start Up
Power Up
Normal Mode
EN INH Vcc
high high ON
EN
low
EN
(V_CC
high
ON)
EN
high
Stand-By
EN INH RxD V_CC
low high ^low1) ON
high³⁾
Sleep Mode
EN
INH V_CC
low floating OFF²⁾
Wake Up
t > t_WAKE
1) _{after wake-up via bus}
2) _{ON when INH not connected to voltage regulator}
3) _{after start up}
Figure 3: operation mode state diagram
Master Termination
For fail safe reasons, the TLE6259-2 already has a pull up resistor of 30kW implemented.
To achieve the required timings for the dominant to recessive transition of the bus signal
an additional external termination resistor of 1kW 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 1nF in the
master node (see figure 6 and 7, application circuit).
External Capacitors
An capacitor of 22µF at the supply voltage input V_S buffers the input voltage. In
combination with the required reverse polarity diode this prevents the device from
detecting power down conditions in case of negative transients on the supply line.
Version 2.06
5
2003-02-21