P82C150AHT datasheet(28/36 Pages) PHILIPS

28 / 36 page

1996 Jun 19

Philips Semiconductors

Preliminary speciﬁcation

CAN Serial Linked I/O device (SLIO) with

digital and analog port functions

P82C150

11.6

Using ADC

The application in Fig.16 can be used for analog-to-digital

conversion for only one analog input signal. The

evaluation of ADC were done with the values

R1 = R2 = 100 k

Ω and C = 3.3 nF; under these conditions

the ADC may reach an accuracy of 7 to 8 bit (depends on

application). The external components should be

connected close to the port pins P15 and P16 with short

wiring to avoid disturbances at the analog input

port pin P15.

Using the on-chip multiplex function the P82C150 provides

up to six input port pins to convert analog input signals to

digital values (see Fig.17).

The period for one ADC cycle is identical to the length of

one DPM cycle.

11.7

Using analog input port functions

Figure 18 shows the wide range of analog input

applications:

• Comparison of two analog input signals.

• Comparison of one analog input signal against a fixed

threshold.

• Window comparator including monitoring the

comparator outputs at the port pins P8 and P9;

additional automatically generated messages, when the

corresponding port bits in the Negative Edge and/or

Positive Edge register are set.

• Local control two-step system.

Fig.16 ADC implementation.

handbook, halfpage

P82C150

P16

P15

one analog input signal

for A/D conversion

MHA076

Fig.17 Two multiplexed analog input signals

switched for analog-to-digital conversion

(maximum 6 signals; see Fig.5).

handbook, halfpage

P82C150

feedback

P15

P16

P14

analog signal

MHA075

SW3 to

SW1

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