Remote-processing RPC-220 Uživatelský manuál Strana 44

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EXPANSION PORT SECTION 14
Page 14-2
If you expect to operate the board at higher
temperatures, use the following formula to determine
maximum pow er dissipation:
P(MAX) = 125 - T
A
----------
60
Where: T
A
is ambient temperature.
Use a heat sink for a TO-220 IC. Suggested heat sink
types from Aavid are:
AAvid P/N Height P(MAX)
@ 25°C @5 0°C
577002B00000 0.250" 2.85 2.14
577102B00000 0.375" 3.46 2.63
577202B00000 0.500" 3.64 2.73
Other heat sink types and styles may be used depending
upon your mounting c onsidera tions. Heat dissipa tion is
greatly increased with air flow around the regulator.
Be sure to use silicone grease to increase heat flow. An
insulator is norma lly not necessar y unless you w ant to
keep the heat sink from shorting to an external case.
LOW POWER MODES
Low power modes are discussed in SECTION 7, REAL
TIME CLOC K, LOW POWER MODES.
Expansion Port Pin Out
J2 Pin Description
1 Data bus 0
2 I/O chip select (active low)
3 Data bus 1
4 High voltage (5.4 to 24 V) power
5 Data bus 2
6 INT 0
7 Data bus 3
8 Reset (active low)
9 Data bus 4
10 + 5V supply
11 Data bus 5
12 Power ground
13 Data bus 6
14 Power ground
15 Data bus 7
16 Address A4
17 Address A0
18 + 5V supply
19 Address A1
20 Address A5
21 Address A2
22 no connect - leave open
23 Address A3
24 ALE signal from CPU
25 Read strobe (active low)
26 Write strobe (active low)
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