Kenwood TS-990S Service Manual

TS-990S
68
SEMICONDUCTOR DATA
Pin No. Name I/O Function
21 SDSCS O
SRX-DSP chip select
L: Enable
22 NC O No connection
23 MDRET O Communication request to TXMRX-DSP
24 SDRET O Communication request to SRX-DSP
25 BEEP O
Beep pattern instruction
H: Beep output
26 MVOX I
VOX transmit (MIC) signal input
H: Active
27 SWST1 I
SRX-DSP programming status signal
input
28 AVOX I
VOX transmit (ANI) signal input
H: Active
29 NC O No connection
30 TXC I
TX ON/OFF
H: TX ON
31 CKY I
RF power ON/OFF
H: Power ON
32 MABK1 I
AF blanking signal input for TXMRX-DSP
H: Mute
33 SABK1 I
AF blanking signal input for SRX-DSP
H: Mute
34 MABK2 I
AF blanking signal input for TXMRX-DSP
H: Mute
35 SABK2 I
AF blanking signal input for SRX-DSP
H: Mute
36 MIBK I
IF blanking signal input for TXMRX-DSP
H: Mute
37 SIBK I
IF blanking signal input for SRX-DSP
H: Mute
38 MDREQ I
Communication request form TXMRX-
DSP
39 SDREQ I Communication request form SRX-DSP
40 NC O No connection
41 BKC I
Reduced voltage detect interrupt
H

L: Interrupt
42 DFRRG I
Compulsion fi rmware programming
Mode detect
43 DRXD I Serial data input from main MPU
44 DTXD O Serial data output for main MPU
45 DCTS I RTS signal input from main MPU
46 DRTS O RTS signal output to main MPU
47 MCTDET I
CTCSS detection signal input form
TXMRX-DSP
H: CTCSS detection
48 SCTDET I
CTCSS detection signal input form SRX-
DSP
H: CTCSS detection
49 AN0 O No connection
50 AN1 O No connection
51 NC O No connection
Pin No. Name I/O Function
52 ANISEL O
ACC2 audio/ USB audio select
H:USB audio/ L: ACC2 audio
53 MODSEL O
Modulation select
H: FM modulation/ L: TIF
54 SMUTE2 O Audio mute control for Ext.SP2
55 SMUTE 1 O Audio mute control for SP1/Ext.SP1
56 PMUTE O Audio mute control for phone circuite
57 SP2DET I Ext.SP2 detection
58 MDBT O
Boot confi guration select for TXMRX-
DSP
H: FLASH boot/ L: SPI slave boot
59 SDBT O
Boot confi guration select for SRX-DSP
H: FLASH boot/ L: SPI slave boot
60 PHDET I Phone detection
61 VOLEN O Load enable for DAC (IC658)
62 VOLDT O Data output for DAC (IC658)
63 VOLCK O Clock output for DAC (IC658)
64 NC O No connection
TXMRX-DSP: (DSP unit IC202)
Pin No. Name I/O Function
1 VDDINT I Internal (core) supply voltage (1.2V)
2
CLK_
CFG0
I
Core to CLKIN raito control (GND con-
nect)
3
CLK_
CFG1
I
Core to CLKIN raito control (GND con-
nect)
4
BOOT_
CFG0
I Boot confi guration select (GND connect)
5 MDBT I
Boot confi guration select
H: FLASH boot/ L: SPI slave boot
6 GND - GND
7 VDDEXT I External (I/O) supply voltage (3.3V)
8 GND - GND
9 VDDINT I Internal (core) supply voltage (1.2V)
10 GND - GND
11 VDDINT I Internal (core) supply voltage (1.2V)
12 GND - GND
13 VDDINT I Internal (core) supply voltage (1.2V)
14 GND - GND
15 MDRET I
Communication request from DSP-sub
MCU
16 MDREQ O
Communication request to DSP-sub
MCU
17 AD7 I/O Address/Data bus for fl ash memory
18 GND - GND
19 VDDINT I Internal (core) supply voltage (1.2V)
20 GND - GND
21 VDDEXT I External (I/O) supply voltage (3.3V)

Kenwood TS-990S Specifications

General

Receiver Type	Triple Conversion Superheterodyne
Antenna Tuner	Built-in automatic antenna tuner
DSP	Yes
IF DSP	Yes
Modes	SSB, CW, AM, FM
Display	7-inch TFT color LCD
Weight	25 kg (55.1 lbs)
Antenna Connectors	SO-239
Power Supply	13.8V DC