AN1139 STMicroelectronics, AN1139 Datasheet - Page 42

• Manufacturer Part Number: AN1139
• Description: L6254 - L6268 - L6269 12V DISK DRIVE POWER COMBO IC
• Manufacturer: STMicroelectronics

AN1139 APPLICATION NOTE
Figure 26. SPDS Application Board, Connectors And Jumpers Location
The Supply to the board is provided through the Supply connector. 12V and 5V are required. The Spindle and
the VCM are connected respectively to the Spindle and Voice Coil connectors. A print on the PCB depicts the
phases and polarity connection. Five jumpers are available on board for evaluation purpose.
Jumper JP1 inserts a Schottky diode between the VCC and the ICs in case the ISOFET is not required. JP2
connects the PC ground to the Application board ground. JP3 connects the Vboost storage capacitor to VCC or
Ground (suggested to VCC). JP4 connects the Input of the Sense Amplifier (Isense) to the sense resistor (must
be inserted). JP5 connects the VCC power supply to the Voice Coil section (must be inserted). A separate man-
ual with a detailed schematic and explanation of the Application Board is available inside the SPDS tool box.
6.3.2 SPDS Software
The Smart Power Development System Software is available on a 1.4M floppy disk. The diskette content is a
number of files (7) that must be loaded and run from the fixed disk. It is suggested to set up a subdirectory for
example “SPDS” and copy all the files into it. The software runs under DOS environment and the following mod-
ification needs to be done to the CONFIG.SYS file.
C:\...\EMM386.EXE NOEMS X=CD00-CFC0
FILES=40 (or higher)
BUFFERS=40 (or higher)
A file called README.TXT is include in the diskette, to read it use a common ASCII editor. Following is the
directory of the files present on the floppy disk.
ST.BAT
LOGO.EXE
MOUSE.EXE
42/64
Starts the SPDS program lunching the LOGO.EXE file
Displays the STMicroelectronics logo
Installs the MOUSE driver
JP2
INTERFACE BOARD
B N C
JP1
CONNECTOR C2
G N D
V C C
TO / FROM
PORT 1
JP3
JP4
JP5
SPINDLE
SPINDLE
INTERFACE BOARD
CONNECTOR C4
TO / FROM
TIMER
VOICE COIL
VCM
12V
5V
SUPPLY
P O W E R