SYNCOAM Co., Ltd.
SEPS225
Version: 0.8
3. Pin Description
Pin Name
Number
Of Pins
I/O
Connected
To
Description
CPU
1
I
VSS or VDD
Selects the CPU type
Low : 80‐Series CPU, High : 68‐Series CPU
PS
1
I
VSS or VDD
Selects parallel/Serial interface type
Low : serial, High : parallel
Selects the SEPS225.
CSB
1
I
MPU
Low : SEPS225 is selected and can be accessed
High : SEPS225 is not selected and cannot be accessed
RS
1
I
MPU
Selects the data / command
Low : command, High : parameter / data
For an 80‐system bus interface, read strobe signal(active low)
RDB/E
1
I
MPU
For an 68‐system bus interface, bus enable strobe(active high)
When using SPI, fix it to VDD or VSS level
For an 80‐system bus interface, write strobe signal(active low)
WRB/RWB
1
I
MPU
For an 68‐system bus interface, read/write select
Low : Write, High : Read
When using SPI, fix it to VDD or VSS level
Serves as a 18_bit bi‐directional data bus
PS
Description
8_bit bus : DB[17:10]
DB[17:0]
18
I/O
MPU
1
9_bit bus : DB[17:9]
16_bit bus : DB[17:10], DB[8:1]
18_bit bus : DB[17:0]
DB[17] SCL : Synchronous clock input
0 DB[16] SDI : Serial data input
DB[15] SDO : Serial data output
Fix unused pins to the VSS level
OSCA1
OSCA2
Fine adjustment for oscillation
1
I
Oscillation‐ Tie 39 ㏀ ohms to OSCA1 between OSCA2
Resistor
When the external clock mode is selected, OSCA1 is used
1
O
external clock input
RESETB
1
I
MPU
Reset SEPS225(active low)
S[383:0]
384
O
PANEL SEPS225 Display column outputs
G[127:0]
128
O
PANEL SEPS225 Display row outputs
VDDH
4
‐
POWER External Column Driving Power Supply(8V ~ 18V)
VSSH
4
‐
POWER Return Ground for VDDH
VDD
2
‐
POWER Logic power supply(2.4V ~ 3.3V)
VSS
IREF
2
‐
POWER Logic ground.
1
‐
Resistor Tie 70 ㏀ ohms to VSS
TEST1
1
I VSS or VDD Selects the test mode
PRER
1
O
‐
Pre_charge R
PREG
1
O
‐
Pre_charge G
PREB
1
O
‐
Pre_charge B
EXPORT1
1
O
‐
OSC Test
VSYNCO
1
O
‐
Vertical Sync. Output
VSYNC
1
I
‐
Vertical Sync. Input when RGB mode is selected
HSYNC
1
I
‐
Horizontal Sync. Input when RGB mode is selected
DOTCLK
1
I
‐
Dot clock Input when RGB mode is selected
ENABLE
1
I
‐
Video enable Input when RGB mode is selected
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