SL20T0081 View Datasheet(PDF) - System Logic Semiconductor
Part Name
Description
MFG CO.
'SL20T0081' PDF : 56 Pages View PDF
SLS System Logic Semiconductor
SL20T0081
System Control pins
Pin Name
I/O
Function
This pin selects the master/slave operation for the SL20T0081 chip. Master operation
outputs the timing signals that are required for the LCD display, while slave operation
inputs the timing signals required for the liquid crystal display.
MS = 1 : Master operation
MS = 0 : Slave operation
Following table shows difference of the master operation and the slave operation.
MS
I
MS
CLS
Internal Oscillator
Circuit
Internal Power
Supply Circuit
CL
SYNC DISP
1
1
0
Enabled
Disabled
Enabled
Enabled
Output Output Output
Input Output Output
0
-
Disabled
Disabled
Input Input Input
CL
CLS
SYNC
DISP
DUTY0
DUTY1
DUTY2
HPMB
This is the display clock input/output pin.
I/O
When multiple SL20T0081 chips are used in master/slave mode, all of CL pins must be
connected each other.
Internal RC oscillator enable pin.
CLS = 1 : Internal oscillator circuit is enabled.
I
CLS = 0 : Internal oscillator circuit is disabled.
When CLS=0, the display clock must be inputted through the CL pin.
This pin is valid only when SL20T0081 operating in master operation.
LCD synchronization signal input/output pin.
I/O
When multiple SL20T0081 chips are used in master/slave mode, all of SYNC pins must be
connected each other.
This is the liquid crystal display blanking control pin.
I/O
When multiple SL20T0081 chips are used in master/slave mode, all of DISP pins must be
connected each other.
The LCD driver duty ratio selection pins.
DUTY2
DUTY1
DUTY0
Duty ratio
1
1
1
1/81
1
0
0
1/81
0
1
1
1/65
0
1
0
1/55
I
0
0
1
1/49
0
0
0
1/33
Common Output
Even, Odd
normal
“
“
“
“
When Duty = (1, 1, 1), 1/81 duty ratio is selected, and common output pin configuration is
changed. At this mode, all even numbered common output pins are outputting right side of
the device and all odd numbered common output pins are outputting left side of the
device.
This is the power control pin for the power supply circuit for liquid crystal drive.
HPMB = 1 : Normal mode
I
HPMB = 0 : High power mode
This pin is enabled only when the master operation mode is selected.
It is fixed to either 0 or 1 when the slave operation mode is selected.
Share Link: 
