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16 lCD DRiVeR (lCD)
S1C17153 TeChniCal Manual
Seiko epson Corporation
16-1
(Rev. 1.0)
LCD Driver (LCD)
16
lCD Module Overview
16.1
The S1C17153 includes an LCD driver capable of driving an LCD panel with up to 128 segments (32 segments
×
4
commons).
The main features of the LCD driver are listed below.
• Number of SEG and COM outputs 32 SEG
×
4/3/2/1 COM
• Drive bias
1/3 bias (fixed)
• Display data RAM
32 bytes
• Frame frequency configuration
Selectable from four different frequencies
• LCD display mode
Normal display mode
All on mode
All off mode
Inverted display mode
• Other functions
LFRO signal output, frame interrupt
Figure 16.1.1 shows the LCD driver and drive power supply configuration.
COM
x
SEG
x
LFRO
DSPAR
DSPC[1:0]
LDUTY[2:0]
FRMCNT[1:0]
DSPREV
To ITC
Frame interrupt request
V
C1
–V
C3
LCD power
supply circuit
Display memory
Driver
control circuit
Clock
control circuit
IFRMEN
Interrupt
control circuit
Power supply circuit
LCD driver
LHVLD
VCSEL
LCLK
OSC1A
OSC3B
Divider
(1/1024–1/8192)
Divider
(1/64)
Gate
LCDTCLKE
LCDTCLKD[1:0] LCDTCLKSRC[1:0]
1.1 LCD Driver and Driver Power Supply Configuration
Figure 16.
lCD Power Supply
16.2
The LCD drive voltages V
C1
to V
C3
are generated by the on-chip LCD power supply circuit. No external power sup-
ply is needed. For more information on the LCD power supply, see the “Power Supply” chapter.