ZMD30011 datasheet(8/22 Pages) ZMD

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ZMD30011

LIN Transceiver

Datasheet

PRELIMINARY

3.3

TXD Dominant Time-out Function

An internal timer prevents the LIN-bus from being permanently driven in dominant state. If TXD is at low level for

longer than tBus_dom > tTXDTIMEOUT the pin LIN is switched of to recessive mode. To reset this mode the pin TXD has to

be switched high before switching LIN to dominant state again.

3.4

Internal Voltage Regulator

The transceiver has an internal voltage regulator generating a voltage VDD=5V from the battery supply VSUP. This

works in all operation modes. In the sleep-mode this voltage regulator changes into a low-power-mode. This mode

guaranties the supply of the receiver and the sequence control.

3.5

Battery Voltage Control

The battery voltage control is realized indirectly by a power-on-clear-circuit supervising the internal supply VDD. This

circuit gives a signal to the sequence control if the external supply voltage VSUP falls below 6.5V. In this case a

contingent bus transfer can be prevented and the transceiver changes into the wait-mode.

3.6

3.3V and 5V Logic Capability

The ZMD30011 can be used for 3.3V and 5V micro controllers. EN, RXD and TXD are capable to operate with both

voltage levels. Therefore an external pull-up resistor is required at the RXD pin.

ZMD30011 Datasheet(PDF) 8 Page - Zentrum Mikroelektronik Dresden AG