Philips DVDR600VR/37, Service Manual

Page: 191 / 204

Circuit Descriptions, Abbreviation List, and Data Sheets
EN 40 VAD8041 9.
Pin description
Symbol Pin Type Drive
/Thr. Description
AEZ 1 I hy
pd T Alpha Error Zero/Alpha Set Zero
V
DDD3
2 P - Digital Pad Supply
V
SSD3
3 P - Digital Pad Supply
CLOCKOUT 4 T M Buffered Oscillator Output
OSCO 5 AO A Output of inverting Amplifier that forms oscillator
OSCI 6 AI A Input of inverting Amplifier that forms oscillator
TEST1D 7 I pd T Test pin
AMEAS 8 AI A Alpha Measure – value of measured disk writing
quality
V
DDA1
9 P - Analogue Supply
V
SSA1
10 P - Analogue Supply
LASP 11 AO A Laser Power – indicates power level
VREFL 12 AO A Bandgap Voltage Reference ground connection
VREFH 13 AO A Bandgap Voltage Reference output
VDEL 14 AI A Voltage input for Delta “laser power”
VTHR 15 AI A Voltage input for Threshold “laser power”
VOPUREF 16 AO A Reference Voltage for OPU
VREFIN 17 AI A Input Reference Voltage for Vthr and Vdel
V
DDA2
18 P - Analogue Supply
V
SSA2
19 P - Analogue Supply
TEST1A 20 AB A Test pin
IAPCW 21 AO A Current Output of Delta Reference
IAPCR 22 AO A Current Output of Threshold Reference
TEST2A 23 AB A Test pin
ENR2 24 T M Programmable Output Flag
ENR1 25 B pd M/T Device Initialisation/Programmable Output Flag (must
be driven to VDD during reset)
DVDCD 26 T M Programmable Output Flag for indicating DVD/CD
mode
HILO 27 T M Programmable Output Flag for indicating High/Low
reflectivity
V
SSD1
28 P - Digital Pad Supply
V
DDD1
29 P - Digital Pad Supply
BUSY 30 B M/T Busy Enable input from Elantec / Board test IO
SEN 31 B M/T Serial Enable output to Elantec / Board test IO
SDIO 32 B M/T Serial data input output from/to Elantec / Board test IO
SCLK 33 B M/T Busy Enable input from Elantec / Board test IO
WSB 34 B M/T Write Strategy Bank – output controls OPU write
switching / Board test IO