Bionet BM3 - CPU Components; Memory Components; LCD Components; LAN Controller;Watch Dog Timer

BM3 www.BIO2NET.com
Revision A
- 24 -
CPU components
Samsung’s S3C44B0X is installed operating at the 3.5 times speed of
18.432MHz, 64.512MHz. The CPU includes the STN LCD CONTROLLER;
Real Time Clock is installed inside allowing the activation of the interior
clock, if the crystal of 32.768KHz and power are supplied.
Memory components
Consists of the ROM 2MByte (Hynix HY29LV160BT) and RAM 8MByte
(Samsung K4S641632); by moving program images of the ROM to RAM
commands are run.
BACKUP Memory component
Consists of the 128KByte SRAM and theSRAM BACKUP CONTROLLER;
Lion Batteryof 3V is required. Data needed even when the power is turned
on is saved.
LCD components
Consists of the signal buffer, the DAC(Digital-Analog Conver), the Op Amp
and the DC-DC Converter. DC-DC Converter converts +5V into +28V then
supplies power to the Op Amp. The Op Amp multiplies the output of the
DAC(0~2V) by 15 times. The output of the Op Amp equals to the LCD Bias
Voltage. +3.3V signals from the CPU becomes +5V signals through the
buffer, then is supplied to the LCD.
LAN Controller
Consists of Cirrus Logic’s CS8900 Ethernet Controller and supports
10Base-T.
3V Lion
Back-up power for CPU’s RTC and SRAM.
WATCH DOG TIMER
Resets the system should there be any failure in the system operation;
saves system settings in the interior memory