Remote-processing RPC-2350 Manual do Utilizador descarregar pdf (Página 75)

POWER AND EXPANSION PORT CHAPTER 16

16-2

Figure 16-2 Power connector detail

POWER OUTPUT

There are several pow er outputs available from both

RPC-2350 and RPC-2350G. ±12V power is available at

the analog connector J7. Current is limited to about 40

Ma. See Chapter 8, “AN ALOG POWER SUP PLY” for

more information.

The RPC -2350G can supply regulated + 5V power at P2,

with 6. 5 to 30V at the input. Approximately 750 Ma . is

available for external devices. See "Heat sinking" below

if you intend to draw any significant (> 200 mA.)

current from the board.

This extra cur rent can supply E L displays, opto racks,

LED displays and back lighting, or other devices.

Heat sinking

A heat sink under U23 is normally not necessary. You

should use a heat sink when all 4 conditions below are

met:

1. You are supplying 6 to 30VDC to power the

board.

2. Current from the board (to power external

devices such as opto racks) approaches 750

mA.

3. The ambient temperature will be more than 60°

4. Supply voltage is usually less than 9 volts.

WARNING:

U23 can get VERY HOT, exceeding 100°C (ho tte r

than boiling water) and still operate normally. DO

NOT TOUC H U23!

Normally U23 is very warm to touch (40°C). As current

demand increa ses and/ or supply voltage decr eases, its

temperature increase s.

U23 uses a heat sink for a TO-220 IC. Suggested heat

sink by Aavid is: 577202B00000. This part is available

from DigiKey (800 344 4539).

EXPANSION PORT P1

The expansion port brings out address, data, and control

lines for an external board. This external board can

consist of counters, timers, digital I/O, and analog I/O.

6 address and 8 data, read, write, select, and other

power and control lines are provided.

Expansion port I/ O address range is &100 - & 13F. This

equals 64 addresses.

Timing is simple, based on Z80 I/O signals. Access

times for external devices should be 200 nS. or faster.

Data is read on the rising edge of IRD. See timing

diagram below.

Figure 16-2 I/O timing

All logic levels are TTL. High speed CMOS IC;s

should be used when interfacing to this bus.

Connection between P1 an d your bo ard is via a sim ple

26 pin ribbon cable. Limit cable length to 3 inches.

1 2 ... 70 71 72 73 74 75 76 77 78 79 80 81 82 83

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