4
2. S
YSTEM
B
LOCK
D
IAGRAM and
MT1379
P
IN
D
ESCRIPTION
2.1
MT1379
PIN DESCRIPTION
SYMBOL
TYPE
PIN NUMBERS
DEFINITION
20,28,60,77,92,102
DVSS
Ground
115,125,135,145
Ground pin for internal digital circuitry
178,189
Current reference input. It generates reference
IREF
Analog Input
1
Current for data PLL. Connect an external 100K
Resistor to this pin and PLLVSS.
PLLVSS
Ground
2
Ground pin for PLL and analog circuitry
LPIOP
Analog Output
3
Positive output for low pass filter(LFP)
LPION
Analog Output
4
Negative output for LFP
LPFON
Analog Output
5
Negative output of loop filter amplifier(LFA)
LPFIP
Analog Input
6
Positive input of LFA
LPFIN
Analog Input
7
Negative input of LFA
LPFOP
Analog Output
8
Positive output of LFA
JITFO
Analog Output
9
RF jitter meter output
JITFN
Analog Input
10
Negative input of the operational amplifier for RF jigger meter
PLLVDD3
Power
11
3.3V power pin for data PLL and related analog circuitry
FOO
Analog Output
12
Focus servo output. PDM output of focus servo compensator
TRO
Analog Output
13
Tracking servo output. PDM output of tracking servo compensator
Tray open output,controlled by microcontroller. This is PWM output
TROPENPWM
Analog Output
14
for TRWMEN27hRW2=1 or is digital output for TRWMEN27hRW2=0
PWMOUT1-2
Analog Output
15-16
1st and 2nd general PWM output.
DVDD2
Power
17,42,72,82,120,140,182 2.5V power pin for internally fully digital circuitry.
DMO
Analog Output
18
Disk motor control output. PWM output.
FMO
Analog Output
19
Feed motor control PWM output.
FG
Input
21
Motor Hall sensor input
HIGHA0-5
Inout 2~16MA,SR
PU
22-27
Microcontroller address 8-13
HIGHA6-7
Inout 2~16MA,SR
PU
29-30
Microcontroller address 14-15
AD7-4
Inout 2~16MA,SR
31-34
Microcontroller address/data 7-4
DVDD3
Power
35,66,97,111,130,150,185
,192
3.3 power pin for internal digital circuitry
AD3-0
Inout 2~16MA,SR
36-39
Microcontroller address/data 3-0
IOA0-1
Inout 2~16MA,SR
PU
40-41
Microcontroller adress 0-1/IO
IOA2-7
Inout 2~16MA,SR
PU
43-48
Microcontroller adress 2-7/IO
A16-17
Output 2~16MA,SR
49-50
Flash adress 16-17
IOA18-20
Inout 2~16MA,SR
SMT
51-52
Flash adress 18-19
APLLVSS
Ground
54
Ground pin for audio clock circuitry
APLLVDD3
Power
55
3.3V power pin for audio clock circuitry
ALE
Inout
2~16MA,SR,PU,S
MT
56
Microcontroller address latch enable
IOOE#
Inout 2~16MA,SR
SMT
57
Flash output enable, active low I/O
IOWR#
Inout
2~16MA,SR,SMT
58
Flash write enable, active low/IO
IOCS#
Inout
2~16MA,SR,PU,S
MT
59
Flash chip select,active low/IO
UP1_2-6,7
Inout
4MA,SR,PU,SMT
61-65,67
Microcontroller port 1-2…1-7
UP3_0-1
Inout
68,69
Microcontroller port 3-0,3-1
