Functional description

L9616

10/17

DocID7425 Rev 3

4

Functional description

The L9616 is used as an interface between a CAN controller and the physical bus. The

device provides transmitting capability to the CAN controller.

The transmitter outputs C_H and C_L are protected against short circuits and electrical

transients which may occur in an automotive environment.

In case of short circuit (C_H to C_L, C_H to B) the protection circuit recognizes this fault

condition and the transmitter output stages are disabled with a delay of max. 10 ms to

prevent destruction of the IC and high consumption of supply current IS. If VC_L > VC_L max

the transmitter output stages would be disabled immediately.

Pin ASC makes it possible to select two different modes of operation: high speed

(≤ 1 Mbaud) and low speed (≤ 250 kbaud).

The ASC pin is tied to GND for normal operation at ≤ 1 Mbaud. For slower speed operation

at ≤ 250 kbaud the rise and fall slope of the bus output can be decreased to reduce EMI by

connecting the ASC pin to VS.

Figure 3. Typical application

Table 6. Functional table

TXO

C_H

C_L

Bus state

RXO

L

H

L

Dominant

L

H or Floating

Floating VS/2

Floating VS/2

Recessive

H