Low power modes – Remote Processing RPC-220 User Manual
Page 44
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(MA X) = 125 - T
A
----------
60
W h e re : T
A
is ambient temperature.
Use a heat sink for a TO-220 IC. Suggested heat sink
types from Aavid are:
A A v id P / N
Height
P(MAX)
@ 2 5°C @5 0°C
577002B00000
0.250"
2.85
2.14
577102B00000
0.375"
3.46
2.63
577202B00000
0 . 5 00 "
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 no rma 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, L OW P OWE R MO DES.
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 gr ound
13
Data bus 6
14
Power gr ound
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)