Document
LM3121B
LCD Module User Manual
Prepared by: K.C.
Date: 2009-07-20
Checked by: Date:
Approved by: Date:
Rev. Descriptions 0.1 Preliminary Release
URL: www.topwaydisplay.com www.topwaysz.com
Release Date 2009-07-20
Document Name: LM3121B-Manual-Rev0.1.DOC Page: 1 of 9
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Table of Content
LCD Module User Manual
LM3121B
1. Basic Specifications................................................................................................................ 3
1.1 Display Specifications ............................................................................................................................................ 3 1.2 Mechanical Specifications...................................................................................................................................... 3 1.3 Block Diagram........................................................................................................................................................ 3 1.4 Terminal Functions................................................................................................................................................. 4
2. Absolute Maximum Ratings.................................................................................................... 5
3. Electrical Characteristics........................................................................................................ 5
3.1 DC Characteristics ................................................................................................................................................. 5 3.2 LED Backlight Circuit Characteristics..................................................................................................................... 5 3.3 AC Characteristics ................................................................................................................................................. 6
4. Function Specifications .......................................................................................................... 7
4.1 Basic Setting .......................................................................................................................................................... 7 4.2 Resetting the LCD module ..................................................................................................................................... 7 4.3 Adjusting the LCD Display Contrast ....................................................................................................................... 7 4.4 Display Data RAM Memory Map ............................................................................................................................ 8 4.5 Display Command.................................................................................................................................................. 8
5. Design and Handling Precaution ........................................................................................... 9
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LCD Module User Manual
1. Basic Specifications
1.1 Display Specifications
1) LCD Display Mode 2) Display Color
3) Viewing Angle 4) Driving Method 5) Back Light
: FSTN, Negative, Transmissive : Display Data = “1” : Light Gray (*1) : Display Data = “0” : Dark Gray (*2) :6H : 1/32 duty, 1/5bias : White LED backlight
Note: *1. Color tone may slightly change by Temperature and Driving Condition. *2. The Color is defined as the inactive / background color
1.2 Mechanical Specifications
1) Outline Dimension
: 231.0 x 53.6 x 12.5MAX (see attached Outline Drawing for details)
1.3 Block Diagram
BLA BLK
LED Backlight Circuit
LCD Panel 202 x 32 pixels
LM3121B
LCD Power & Booster Circuit
V0 VDD VSS
DB0 - DB7 R/W, A0 E1 E2 E3
/RES
SED1520 or equivalent
SED1521 or equivalent
SED1520 or equivalent
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LCD Module User Manual
LM3121B
1.4 Terminal Functions
Pin Pin No. Name
I/O
Descriptions
1 VSS Power Negative Power Supply, Ground (0V)
2 VDD Power Positive Power Supply
3 V0 Input LCD Contrast Reference
4 VOUT Power LCD Booster Output for V0
5 /RES Input Reset signal (*2)
Resetting: rising edge and falling edge of RES
Normal Running: /RES=High
6 DB7 I/O
Bi-directional Data Bus for display data or instruction data
::
13 DB0
14 R/W Input Read /Write Control Signal
15 A0
Input A0 = H; DB0 – DB7 = Display Data
A0 = L; DB0 – DB7 = Instruction Data
16 E1
Input Enable Signal for left section of the LCD module
17 E2
Input Enable Signal for middle section of the LCD module
18 E3
Input Enable Signal for right section of the LCD module
19 BLA Power Positive Power for LED backlight
20 BLK Power Negative Power for LED backlight
Note:
*1. Display or instruction data could write into the LCD module’s driver/controllers .