AY0438-I/L Microchip Technology, AY0438-I/L Datasheet - Page 4

• Manufacturer Part Number: AY0438-I/L
• Description: IC LCD DRIVER CMOS 32SEG 44PLCC
• Manufacturer: Microchip Technology

Specifications of AY0438-I/L

• Package / Case: 44-PLCC
• Display Type: LCD
• Configuration: 32 Segment
• Interface: Parallel
• Digits Or Characters: 16 Characters
• Current - Supply: 25µA
• Voltage - Supply: 3 V ~ 8.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Number Of Digits: 4
• Number Of Segments: 32
• Maximum Clock Frequency: 1.5 MHz
• Operating Supply Voltage: 3 V to 8.5 V
• Maximum Power Dissipation: 250 mW
• Maximum Operating Temperature: + 85 C
• Maximum Supply Current: 60 uA
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

AY0438
1.4
In order to avoid any race conditions, the Data In and
Load signals should not be changed during a falling
edge of the Clock. Figure 4 and Figure 7 show a typical
timing diagram for a 32 segment and 64 segment LCD
module.
FIGURE 8: INTERFACING TO A LCD MODULE AND PIC16CXX DEVICE
EXAMPLE 1:
;*************************************************************************
;This program shows an interface between a PIC16CXX device
;and the AY0438 LCD controller to control a 7 Segment
;4 digit LCD module.
;The PIC16CXX interface to the AY0438 Hardware:
;
;
;
;
;
;The LCD module is connected to the AY0438 as follows:
;
;
;
;
;
DS70010I-page 4
General
PORTB bit 0 --> CLK
PORTB bit 1 --> DATA IN
PORTB bit 2 --> LOAD
Most Significant digit
3rd Significant digit
2nd Significant digit
Least Significant digit --> seg25 to seg 31
PIC16CXX
RB7
EXAMPLE CODE
RB0
RB1
RB2
Clock
Data In
Load
LCD
AY0438
--> seg1 to seg7
--> seg9 to seg15
--> seg17 to seg 23
SEG19-23
SEG25-31
Backplane
SEG9-15
SEG1
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
1.5
Figure 8 shows a typical layout of an AY0438 con-
nected to a LCD module and interfaced to a PIC16CXX
family device. Example 1 lists code used to program
the PIC16CXX device. This code was complied using
MPASM.
SEG G
SEG D
SEG C
SEG A
SEG F
SEG E
SEG B
Interfacing to a LCD Module and
PIC16CXX Device
F G
E
A
D
B
C
7
7
1995 Microchip Technology Inc.
7
LCD
Backplane