ATA6660 데이터 시트보기 (PDF) - Atmel Corporation

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ATA6660

High-speed Can Transceiver

Atmel Corporation 

3.6 TXD Input

The input stage pin 1 (TXD) is compatible for 3.3V output levels from new controller families.

Pull-up resistance (25 kΩ) forces the IC to Recessive Mode, if TXD-Pin is not connected. TXD

low signal drives the transmitter into dominant state.

3.7 Transmitter

A integrated complex compensation technique allows stable data transmission up to 1 MBaud.

Low level on TXD input forces bus line voltages CANH to 3.5V, CANL to 1.5V with a termination

resistor of 60Ω. In the case of a line short circuit, like CANH to GND, CANL to VCC, integrated

short current limitation circuitry allows a maximum current of 150 mA. If junction temperature

rises above typical 163°C an internal overtemperature protection shuts down both output stages,

the Receive Mode will stay activated.

3.8 Split Termination Concept

With a modified bus termination (see Figure 8-3 on page 10) a reduction of emission and a

higher immunity of the bus system can be achieved. The one 120Ω resistor at the bus line end

nodes is split into two resistors of equal value, i.e., two resistors of 60Ω. The resistors for the

stub nodes is recommended with two resistors of 1.3 kΩ. (for example 8 stub nodes and 2 bus

end nodes) Notice: The bus load of all the termination resistors has to stay within the range of

50Ω to 65Ω.

The common mode signal at the centre tap of the termination is connected to ground via a

capacitor of e.g., Csplit = 10 nF to 100 nF. A separate ground lead to the ground pin of the mod-

ule connector is recommended.

4 ATA6660

4582E–AUTO–02/08

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