ST
Sitronix
Main Features
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Operation Voltage Range:
Ø
2.7V to 5.5V
Support 8-bit, 4-bit and serial bus MPU interface
64 x 16-bit display RAM (DDRAM)
Ø
Supports 16 words x 4 lines (Max)
Ø
LCD display range 16 words x 2 lines
64 x 256-bit Graphic Display RAM (GDRAM)
2M-bits Character Generation ROM (CGROM):
Support 8192 Chinese words (16x16 dot matrix)
16K-bit half-width Character Generation ROM
(HCGROM):
Supports 126 characters (16x8 dot matrix)
32-common x 64-segment (2 lines of character)
LCD drivers
Automatic power on reset (POR)
External reset pin (XRESET)
With the extension segment drivers, the display
area can up to 16x2 lines
Built-in RC oscillator:
Frequency is adjusted by an external resistor
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ST7920
Chinese Fonts built in LCD controller/driver
Low power consumption design
Ø
Normal mode (450uA Typ VDD=5V)
Ø
Standby mode (30uA Max VDD=5V)
VLCD (V0 to V
SS
): max 7V
Graphic and character mixed display mode
Multiple instructions:
Ø
Display Clear
Ø
Return Home
Ø
Display ON/OFF
Ø
Cursor ON/OFF
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Display Character Blink
Ø
Cursor Shift
Ø
Display Shift
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Vertical Line Scroll
Ø
Reverse Display (by line)
Ø
Standby Mode
Built-in voltage booster (2 times)
VOUT: max 7V
1/33 Duty (with ICON)
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Function Description
ST7920 LCD controller/driver IC can display alphabets, numbers, Chinese fonts and self-defined characters. It
supports 3 kinds of bus interface, namely 8-bit, 4-bit and serial. All functions, including display RAM, Character
Generation ROM, LCD display drivers and control circuits are all in a one-chip solution. With a minimum system
configuration, a Chinese character display system can be easily achieved.
ST7920 includes character ROM with 8192 16x16 dots Chinese fonts and 126 16x8 dots half-width alphanumerical
fonts. Besides, it supports 64x256 dots graphic display area for graphic display (GDRAM). Mix-mode display with
both character and graphic data is possible. ST7920 has built-in CGRAM and provide 4 sets software programmable
16x16 fonts.
ST7920 has wide operating voltage range (2.7V to 5.5V). It also has low power consumption. So ST7920 is suitable
for battery-powered portable device.
ST7920 LCD driver consists of 32-common and 64-segment. Company with the extension segment driver (ST7921)
ST7920 can support up to 32-common x 256-segment display.
Part Number
ST7920-0A
ST7920-0B
ST7920-0C
ST7920-0F
Font Code
BIG-5 Code Set (Traditional Chinese)
GB Code Set (Simplified Chinese)
Chinese (Traditional/Simplified) & Japanese
Chinese (Traditional/Simplified), Japanese & Korean
V4.0
1/49
2008/08/18
ST7920
ST7920 Specification Reversion History
Version
C1.7
Date
2000/12/15
1.
2.
3.
4.
1.
2.
3.
4.
5.
6.
1.
2.
3.
4.
5.
Description
VCC changed to VDD.
VLCD changed from VCC-V5 to V0-VSS.
DC characteristics input High voltage (Vih) changed to 0.7VDD.
DC characteristics output High voltage (Voh) changed to 0.8VDD.
Chip Size changed.
ICON 256 dots changed to 240 dots.
XOFF normal high sleep Low changed to normal low sleep High.
Added XOFF application.
Modified application of ST7920: PIN 4~6 are floating. (PIN 4~6 are test pin)
Modified voltage doubler CAP1P, CAP1M, CAP2M capacitors polarity
Icon RAM TABLE changed. (TABLE-6)
Booster description modified. (PAGE-29)
AC Characteristics modified.
Added 2Line 16 Chinese Word (32Com X 256Seg) application circuit.
Added oscillation resistor’s relation to power consumption and frequency.
C1.8
2001/03/01
C1.9
2001/05/28
C2.0
V2.0
V2.0c
V2.0d
V3.0
V3.1
V3.2
V3.3
V3.4
V3.5
V3.6
V3.7
V3.8
V3.9
V4.0
2001/07/03
2001/08/17
2001/10/18
2002/05/09
2002/10/11
2003/04/11
2003/09/09
2004/03/29
2005/5/24
2005/5/24
2005/6/6
2007/7/24
2007/12/20
2008/3/3
2008/8/18
1. Added Register initial values.
2. Voltage booster CAP1M CAP1P polarity changed (PAGE-30).
1. Modified Table 7 (PAGE-14).
2. Change to English version.
1. Modified page-38 Serial interface timing diagram.
1. Add the standard code (Japan, GB code, BIG-5 code).
1. Delete sleep mode function.
1. Modified GDRAM Address (AC5…AC0, 00h…3Fh).
1. Add the CGROM and HCGROM test application circuit.
1. Updat the using method for ICON.
1. ICON no used.
1. Add VOUT voltage limitation.
2. Remove IRAM related descriptions.
1. Fix the check sum count number on Page 28~30.
655360->655362, 10240->10242.
2. Modify the description about serial interface.
1. Add CGROM/HCGROM checksum operation time.
1. Add
“Clear
DDRAM” step before check sum process.
1. Modify 4-bit initial sequence.
1. Add Font Code
“0F”
at Page 1.
2. Modify the description of Font Code Table at Page 1.
V4.0
2/49
2008/08/18
Embedded System
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