P82C150AFT Philips Semiconductors, P82C150AFT Datasheet - Page 27

• Manufacturer Part Number: P82C150AFT
• Description: CAN Serial Linked I/O device SLIO with digital and analog port functions
• Manufacturer: Philips Semiconductors

Philips Semiconductors
11.3
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
4
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
The external oscillator mode is not the normal operation
mode.
11.4
Figures 12 and 13, show the principle application for
digital input and output.
11.5
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.
1996 Jun 19
handbook, halfpage
CAN Serial Linked I/O device (SLIO) with
digital and analog port functions
t
CLK
Fig.14 P82C150 in external oscillator mode.
External oscillator mode
Using digital I/O port functions
Using DPM
of the external clock. The corresponding CAN
N
OTE
clock
reset
5 V
P0/CLK
XMOD
RST
P82C150
MHA078
27
analog
output
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:
t
CYC
digital
input
digital
output
Fig.13 Example for digital output application.
Fig.12 Example for digital input application.
V
=
4096
------------ -
f
Fig.15 Example for DPM application.
OSC
5 V
t
V
P0 to P15
t
Preliminary specification
P0 to P15
DPM1(2)
P10(P4)
P82C150
P82C150
P82C150
P82C150
MHA072
MHA074
MHA073