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CIRCUIT DESCRIPTION
5. Power Supply Circuit
The power supply circuit is configured as shown in
the figure 6. It provides 5C (Common 5V)}, 5R (RX 5V),
5TP (PLL, 5V for TX), ST (5V for TX) and 7R (7V for
the RX RF AMP first MIX). These supply outputs are con-
. trolled by KEY, UNLOCK or power save signals.
Power save timing (OFF duration) is set by the data
contained in the EEPROM located in the control unit. The
. ON duration is fixed at 90 ms and the OFF duration {s
selectable
from
150, 200,
300, 400,
600, 800
or
1200ms.
AVR
UNIT
5c
oT
Ic.
|
i
Qt sw
|
Q1 SW
Sw8 O-——e—
5v AVR
SR
PS ©
>
ra
H:5C
ON
L =: 5C OFF
|
Q2Sw
(All OFF
others)
LH
tts
7R
tT
Q3 SW
01
Sw
,
e4
SW
5TP
Q5 SW
03
SW
KEY O
+
Q7
AVR
H:5R ON
=
ST
LL: 5TP ON
b2
LEVEL
SHIFT
AAA
Wr
Wy
Q8 AVR
Q9
SW
—_
Q10
SW
H: 5T STOP
th
.
UL O
Fig. 6 AVR circuit
29
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