P82C150AHT datasheet(27/36 Pages) PHILIPS

27 / 36 page

1996 Jun 19

Philips Semiconductors

Preliminary speciﬁcation

CAN Serial Linked I/O device (SLIO) with

digital and analog port functions

P82C150

11.3

External oscillator mode

In this mode the P82C150 operates with an external clock

instead with the on-chip RC-oscillator. Figure 14 shows

the application with an external clock.

In this mode the P82C150 can achieve bit rates below

20 kbit/s and above 125 kbit/s. The DPM pulse width is

× tCLK of the external clock. The corresponding CAN

identifier bit at Port P0 is set to a logic 0. Therefore only

eight P82C150 based CAN nodes operate within the same

network in external oscillator mode.

11.3.1

NOTE

The external oscillator mode is not the normal operation

mode.

11.4

Using digital I/O port functions

Figures 12 and 13, show the principle application for

digital input and output.

11.5

Using DPM

The simplest way to generate an analog voltage using the

P82C150 is to apply an external low pass filter at one of

the DPM (Distributed Pulse Modulation) outputs. The

simplest implementation concept is a RC-filter of the first

order (refer to Fig.15). Regarding the selection of the time

constant (edge frequency) of this filter, a trade-off between

minimizing of the ripple voltage for maximum accuracy and

minimum of the settling time has to be considered.

Fig.12 Example for digital input application.

P82C150

+5 V

P0 to P15

digital

input

MHA072

Fig.13 Example for digital output application.

P82C150

digital

output

P0 to P15

MHA073

Fig.14 P82C150 in external oscillator mode.

handbook, halfpage

P82C150

reset

MHA078

clock

P0/CLK

XMOD

RST

+5 V

Fig.15 Example for DPM application.

P82C150

analog

output

DPM1(2)

P10(P4)

MHA074

If the output is loaded by a resistive load, this will decrease the

accuracy due to the voltage drop across the series resistor. In these

cases a low value for the series resistor should be chosen.

The repetition time of one DPM cycle can be derived from:

CYC

4096

OSC

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