Hitachi HTD-K185UK Service Manual page 4

2. SYSTEM BLOCK DIAGRAM AND MT1379 PIN DECRIPTION
2.1 MT1379 Pin Description
Pin Number Symbol
1 IREF
2 PLLVSS
3 LPIOP
4 LPION
5 LPFON
6 LPFIP
7 LPFIN
8 LPFOP
9 JITFO
10 JITFN
11 PLLVDD3
12 FOO
13 TRO
14 TROPENPWM
15 PWMOUT1
16 PWMOUT2
17 DVDD2
18 DMO
19 FMO
20 DVSS
21 FG
22 HIGHAO
23 HIGHA1
24 HIGHA2
25 HIGHA3
26 HIGHA4
27 HIGHA5
28 DVSS
29 HIGHA6
30 HIGHA7
Type
Analog Input Current reference input. It generates reference current for data PLL. Connect
an external 100K resistor to this pin and PLLVSS.
Ground Ground pin for data PLL and related analog circuitry
Analog Output Positive output of the low pass filter
Analog Output Negative output of the low pass filter
Analog output Negative output of loop filter amplifier
Analog Input Positive input of loop filter amplifier
Analog Input Negative input of loop filter amplifier
Analog Output Positive output of loop filter amplifier
Analog Output RF jitter meter output
Analog Input Negative input of the operation amplifier for RF jigger meter
Power 3.3V power pin for data PLL and related analog circuitry
Analog Output Focus servo output. PDM output of focus servo compensator
Analog Output Tracking servo output. PDM output of tracking servo compensator
Analog Output Tray open output, controlled by microcontroller. This is PWM output
for TRWMEN27hRW2=1 or is digital output for TRWMEN27hRW2=0
Analog Output The 1st general PWM output
Analog Output The 2nd general PWM output
Power 2.5V power pin for internal fully digital circuitry
Analog Output Disk motor control output. PWM output
Analog Output Feed motor control. PWM output
Ground Ground pin for internal fully digital circuitry
I n p u t ^ 1 Motor Hall sensor input
Microcontroller address 8
Inout 2-16 MA,
SR PU
Microcontroller address 9
Inout 2-16
MA, SR PU
Microcontroller address 10
Inout 2-1 6MA,
SR PU
Microcontroller address 11
Inout 2-16MA,
SR PU
Microcontroller address 12
Inout 2-16MA,
SR PU
Microcontroller address 13
Inout 2-16MA,
SR PU
Ground Ground pin for internal digital circuitry
Microcontroller address 14
Inout 2-16MA,
SR PU
Microcontroller address 15
Inout 2-16MA,
SR PU
Description