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ATA6660 Datasheet(PDF) 4 Page - ATMEL Corporation

Part No. ATA6660
Description  High-speed Can Transceiver
Download  12 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATA6660 Datasheet(HTML) 4 Page - ATMEL Corporation

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4
4582D–BCD–06/06
ATA6660
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 k
Ω) 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 60
Ω. 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 120
Ω resistor at the bus line end
nodes is split into two resistors of equal value, i.e., two resistors of 60
Ω. The resistors for the
stub nodes is recommended with two resistors of 1.3 k
Ω. (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
50
Ω to 65Ω.
The common mode signal at the centre tap of the termination is connected to ground via a
capacitor of e.g., C
split = 10 nF to 100 nF. A separate ground lead to the ground pin of the mod-
ule connector is recommended.


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