Semiconductor Data - Kenwood TK-285 Service Manual

TK-285/(N)
Pin Port
I/O
No. Name
49 A19 - Not used.
50~59 A9~A18 - Flash memory address bus.
60 VCC - +5V
61 A8 - Flash memory address bus.
62 VSS - GND.
63~70 A0~A7 - Flash memory address bus.
71 MONI I Monitor switch input.
72 EN4 I Encoder pulse input 4.
73 EN3 I Encoder pulse input 3.
74 EN1 I Encoder pulse input 1.
75 MINDAT O Common data output.
76 KEY2 I Key scan input 2.
77 KEY1 I Key scan input 1.
78 RESET O Key scan IC reset output..
79~86 D0~D7 - Flash memory data bus.
87 DTMDAT I DTMF decode IC data input.
88 PF I PF switch input.
89 VOL I Volume level input.
90 BATT I Battery voltage input.
91 ANLSQL I Squelch level input.
92 TEMP I Thermistor input.
93 RSSI I Received signal strength indicator input
(RSSI).
94 AVSS - GND.
95 LSDIN I Low speed data input.
96 VREF - +5V
97 AVCC - +5V
98 SFTSTB1 O Shift register data strobe output.
99 W/N O Wide/Narrow switching output.
100 AFSTB O AF IC data strobe output.
12

SEMICONDUCTOR DATA

Function
PLL System : SA7025DK (TX-RX Unit : IC14)
Block diagram
Pin description
Pin No. Symbol
1 CLOCK Serial clock input.
2 DATA Serial data input.
3 STROBE Serial strobe input.
4 Vss Digital ground.
5 RF Prescaler positive input.
IN
6 Prescaler negative input.
RF
IN
7 Vcc Prescaler positive Supply voltage. This pin supplies
P
power to the prescaler and RF input buffer.
8 REF Reference divider input.
IN
9 RA Auxiliary current setting; resistor to V
10 AUX AuxIliary divider input.
IN
11 PHA Auxiliary phase detector output.
12 V analog ground.
SSA
13 PHI Integral phase detector output.
14 PHP Proportional phase detector output.
15 V Analog supply voltage. This pin supplies power
DDA
to the charge pumps, Auxiliary prescaler.
Auxiliary and Reference buffers.
16 RN Main current setting; resistor to V
17 RF Fractional compensation current setting;
resistor to V
18 LOCK Lock detector output.
19 TEST Test pin; connect to V
20 V Digital supply voltage. This pin supplies power
DD
to the CMOS digital part of the device.
Description
.
SSA
.
SSA
.
SSA
.
DD