ST7558
LCD DRIVER SUPPLY
When the on-chip oscillator is used, this input must be connected
to VDD. An external clock signal, if used, is connected to this input. If
the oscillator and external clock are both inhibited by connecting the
OSC pin to VSS the display is not clocked and may be left in a DC state.
To avoid this, the chip should always be put into Power Down Mode
before stopping the clock.
2
I
OSC
Power Supply Pins
Digital Ground.
Power
Supply
Power
Supply
Power
Supply
Power
Supply
Power
Supply
VSS1
6
12
9
The 2 supply rails VSS1 and VSS2 must be connected together.
Analog Ground.
The 2 supply rails VSS1 and VSS2 must be connected together.
VSS2
VDD
Digital Supply voltage.
The 2 supply rails VDD and VDD2 could be connected together.
If Digital Option pin is high, must be this level
Analog Supply voltage.
VDD2
12
6
The 2 supply rails VDD and VDD2 could be connected together.
If the internal voltage generator is used, the VLCDIN & VLCDOUT must be
connected together and series one capacitor to VSS2.
If an external supply is used this pin must be left open.
If the internal voltage generator is used, the VLCDIN & VLCDOUT must be
connected together. An external supply voltage can be supplied using
the VLCDIN pad. This pad is for external multiple voltage input. In this
case, VLCDOUT has to be left open,
VLCDOUT
Power
VLCDIN
6
Supply
This is a multi-level power supply for the liquid crystal.
VLCDIN ≥V0 ≥V1≥V2≥V3≥V4≥VSS
Power
Supply
Power
Supply
V0,V1, V2, V3, V4
8
1
Monitor Voltage Regulator level, must be left open.
VRS
Test Pin
To test used.
Test0~Test8 must floating
Test0~Test11
Reserve Pin
T
11
Test9 could be connected out for monitor the VLCD(V0) voltage
Test10 must connect to VSS
Test11 must connect to VDD
ALL Reserve Pin must floating
ST7558 I/O PIN ITO Resister Limitation
PIN Name
ITO Resister
No Limitation
PS,IMS,OSC
T1~T8, VRS, V1 , V2 , V3 , V4
Floating
<100Ω
<500Ω
<1KΩ
VDD, Vdd2, Vss1, Vss2 , Vlcdin , Vlcdout
T9,V0
A0,/WR,/RD,CSB, D0 …D7(68/80, 4L-SPI interface)
RESB
<10KΩ
In IIC interface: SDA , SCL ITO resister recommend to less than 100 ohm
Ver 2.3 14/56
2005/10/05
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
