BU38603

Manufacturer Part NumberBU38603
DescriptionSystem Control Servo
ManufacturerROHM Co. Ltd.
BU38603 datasheet
 


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Video ICs
System control servo
BU38603 / BU38703 / BU38803
The BU38603, BU38703 and BU38803 are servo controller ICs for VCRs. They contain a high-speed, 8-bit CPU and
perform the processing required for the drum, capstan, FV and PV completely in software, allowing a large reduction
in the number of external components required. They also contain high-performance linear amplifiers, eliminating the
need for interface ICs. Specialized hardware is included for items that require high-speed processing, to allow
efficient utilization of the CPU.
Applications
VHS VCRs and camcorders
Features
1) CPU
499 commands (69 types)
Memory-mapped I / O
Minimum command execution time: 250ns (8MHz)
2)ROM capacity
BU38603: 16384
8 bit
BU38703: 24576
8 bit
BU38803: 32768
8 bit
3) RAM capacity: 512
8bit
4) Interrupt
Pattern generator: 1
Watch-dog timer: 1
External interrupts: 1
FG interrupts: 5
Internal interrupts: 7
Two timers, serial transmission, interrupt, VHSW,
CTL interval timer (fixed) / VISS
Multi-layer interrupts possible.
5) Free-running counter: 19 bit
6) PWM output: 12 bit
2
7) Pattern generator
17 bits from FRC MSB used.
Output
Internal: 3 bit
External (PO): 5 bit
External (PIO): 6 bit
8) Programmable pre-scaler
CFG: 7 bit
CTL: 6 bit
9) Head amplifier / chroma rotary
Generated from pattern generator output.
10) Built-in AGC. Five-bits used to switch the gain
control registers for the CTL amplifier.
11) CTL counter: 1 / 30 or 1 / 25
12) Data shift PLL calculation: 24 bit
13) Timer: 8 bit
2
14) Synchronous serial input/output: 8 bit
15) VH PULSE
V separeted from composite synchronous snal.
Pseudo V generated from pattern generator
output.
Superimposed pseudo H synchronized with
the composite synchronous signal.
16) VISS / VASS
VASS 0 / 1 discrimination
VISS discrimination threshold: 3
Aspect discrimination.
D / A CTL switching.
17) Standard I / O
Parallel I / O (PIO): 32 bit
Parallel output (PO): 6 bit
18) A / D converter: 8 bits 8 channels
Can be masked-programmed to be parallel inputs.
19) Watch-dog timer
Setting period: 4
20) Linear circuits
DFG: amplifier / comparator
CFG: amplifier / comparator
CTL: differential amplifier / comparator
DPG: comparator
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BU38603 Summary of contents

  • Page 1

    ... System control servo BU38603 / BU38703 / BU38803 The BU38603, BU38703 and BU38803 are servo controller ICs for VCRs. They contain a high-speed, 8-bit CPU and perform the processing required for the drum, capstan, FV and PV completely in software, allowing a large reduction in the number of external components required. They also contain high-performance linear amplifiers, eliminating the need for interface ICs ...

  • Page 2

    ... Recommended operating conditions Parameter Symbol Power supply voltage Clock frequency Operating temperature Topr • Block diagram PO0-PO5 P1-P31 SCK (P0) ADC0-ADC7 COUNTP PBCTL V ref 2 BU38603 / BU38703 / BU38803 Limits Unit 0 DAD V – 500 – 125 DAD Limits Unit 4 ...

  • Page 3

    ... PO3 Parallel output and pattern generator output 38 VHSW Pattern generator VHSW output 39 AHSW Pattern generator AHSW output 40 HAMPSW Head amplifier switch output BU38603 / BU38703 / BU38803 Pin No. Pin name Function 41 CHROT Chroma rotary switch output 42 FV Pseudo Vsync output 43 V Logic circuit power supply ...

  • Page 4

    ... E L Input high level voltage V ADPH Input low level voltage V ADPL Input high level current I ADPH Input low level current I ADPL 4 BU38603 / BU38703 / BU38803 = 5V and f DD Min. Typ. Max. Unit — load, when reset I = 2mA: except pins 4.0 4.5 — ...

  • Page 5

    ... Video ICs • Measurement circuits 1k 1k IclkI xtal B C Iclko BU38603 / BU38703 / BU38803 SW1 TEST pin A 62 SW2 Itest A B SW3 Fig.1 Idad Idda Idd ...

  • Page 6

    ... Video ICs Iadin A SW1 • Application example Serial bus CSYNC Pseudo VSYNC Count pulse 6 BU38603 / BU38703 / BU38803 TEST pin (2- Fig.3 Capstan control Drum control Control 8MHz PWM Interrupt CPU ROM / RAM Head amplifier · ...

  • Page 7

    ... TEMPERATURE Fig. 8 Linear circuit current. • External dimensions (Units: mm) 24.0 0.3 20.0 0 0.35 0.1 0.8 QFP80 BU38603 / BU38703 / BU38803 5 4.9 4.8 4.7 4.6 4.5 4.4 4.3 4.2 4.1 4 – 30 – TEMPERATURE Fig. 6 Logic “H” output voltage. 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 – 30 – 10 ...