TLE6259-2 datasheet(5/18 Pages) INFINEON

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Final Datasheet TLE 6259-2

Version 2.06

2003-02-21

1.5

Application Information

Figure 3: operation mode state diagram

Master Termination

For fail safe reasons, the TLE6259-2 already has a pull up resistor of 30k

W implemented.

To achieve the required timings for the dominant to recessive transition of the bus signal

an additional external termination resistor of 1k

W 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 VS 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.

Start Up

Power Up

Wake Up

t > t

WAKE

low

high

ON)

high

1) after wake-up via bus

2) ON when INH not connected to voltage regulator

3) after start up

Normal Mode

Vcc

INH

high

Sleep Mode

OFF2)

INH

low floating

Stand-By

low1)

high3)

INH

low high

RxD

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