MiTAC E-8590, Service Manual, Page: 38 / 252

37
LCD PC E
LCD PC E
-
-
8590 MAINTENANCE
8590 MAINTENANCE
Built-in NAND-tree pin scan test capability
0.22um, 2.5V, low power CMOS process
Single chip 27 x 27 mm, 1.0 mm ball pitch, 487 pin BGA
Enhanced integrated real time clock (RTC) with date alarm, month alarm, and century field
Thermal alarm on external temperature sensing circuit
I/O pad leakage control
1.2.5 System Frequency Synthesizer And DDR-SDRAM Buffer: ICS950902
The ICS950902 is a main clock synthesizer chip for Intel Pentium 4 based note book systems with VIA style
chipset. This provides all clocks required for such a system. Spread spectrum may be enabled through I 2 C
programming. Spread spectrum typically reduces system EMI by 8dB to 10dB. This simplifies EMI qualification
without resorting to board design iterations or costly shielding. The ICS950902 employs a proprietary closed loop
design, which tightly controls the percentage of spreading over process and temperature variations.
Serial programming I 2 C interface allows changing functions, stop clock programming and frequency selection.