Bionet BM3 - Digital Board Details

BM3 www.BIO2NET.com
Revision A
- 23 -
BACKUP MEMORY
(SRAM)
MEMORY
(ROM(HY29LV160),
SDRAM(K4S)
LCD
(BUFFER, LCD BIAS
VOLTAGE GENERATOR)
DC TO DC CONVERTER
(3.3V, 2.5V GENERATOR)
LAN CONTROLLER
(CS8900)
CPU
(S3C44BOX)
3V Lion
BATTERY
LCD SIGNAL
LCD
CONTRAST
CONTROL
5V 7.2V GND
FROM POWER
B U S C O N TR OL
SIG NA L
D A T A B U S
A DD R E SS B U S
3V BATTERY
POWER
3 V B A T T E RY
P OW E R
3 V B A TT ER Y
PO WE R
3 . 3 V 2 . 5 V
TO PRINTER BOARD
TO SAFETY BOARD
SERIAL CONTROLLER
(ST16C2550)
TO ANALOG BOARDS
WATCHDOG
TIMER
RESET
RE S ET
CLEAR
C LE A R
TI M ER O U T
C PU SE R IA L 0 C PU SE R IA L 1
S ER IA L 1 S ER IA L 0
TO AUX PORT
SP I B U S
TO EXT. BOARD
Power components
Power boards receives +5V, then creates 3.3V and 2.5V through the direct-
direct rectifier.