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PDF AY0438 Data sheet ( Hoja de datos )
| Número de pieza | AY0438 | |
| Descripción | 32-Segment CMOS LCD Driver | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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AY0438
32-Segment CMOS LCD Driver
FEATURES
• Drives up to 32 LCD segments of arbitrary config-
uration
• CMOS process for: wide supply voltage range,
low- power operation, high-noise immunity, wide
temperature range
• CMOS and TTL-compatible inputs
• Electrostatic discharge protection on all pins
• Cascadable
• On-chip oscillator
• Requires only three control lines
APPLICATIONS
• Industrial displays
• Consumer product displays
• Telecom product displays
• Automotive dashboard displays
DESCRIPTION
The AY0438 is a CMOS integrated device that drives a
liquid crystal display, usually under microprocessor
control. The part acts as a smart peripheral that drives
up to 32 LCD segments. It needs only three control
lines due to its serial input construction. It latches the
data to be displayed and relieves the microprocessor
from the task of generating the required waveforms.
The AY0438 can drive any standard or custom parallel
drive LCD display, whether it be field effect or dynamic
scattering; 7-, 9-, 14- or 16-segment characters; deci-
mals; leading + or -; or special symbols. Several
AY0438 devices can be cascaded. The AC frequency
of the LCD waveforms can either be supplied by the
user or generated by attaching a capacitor to the LCD
input, which controls the frequency of an internal oscil-
lator.
The AY0438 is available in 40-lead dual in-line plastic
and 44-lead PLCC packages. Unpackaged dice are
also available.
PIN CONFIGURATION
40-Lead Dual In-line
VDD
LOAD
SEG 32
SEG 31
SEG 30
SEG 29
SEG 28
SEG 27
SEG 26
SEG 25
SEG 24
SEG 23
SEG 22
SEG 21
SEG 20
SEG 19
SEG 18
SEG 17
SEG 16
SEG 15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
CLOCK
SEG 1
SEG 2
SEG 3
VSS
DATA OUT
DATA IN
SEG 4
SEG 5
LCDΦ
BP
SEG 6
SEG 7
SEG 8
SEG 9
SEG 10
SEG 11
SEG 12
SEG 13
SEG 14
44 PLCC
SEG 29
SEG 28
SEG 27
SEG 26
SEG 25
SEG 24
SEG 23
SEG 22
SEG 21
SEG 20
SEG 19
7 39
8 38
9 37
10 36
11 35
12
13
AY0438
34
33
14 32
15 31
16 30
17 29
NC
DATA OUT
DATA IN
SEG 4
SEG 5
LCDΦ
BP
SEG 6
SEG 7
SEG 8
NC
© 1995 Microchip Technology Inc.
DS70010I-page 1
1 page  
AY0438
;The DP are not connected, but can be connected to seg8, 16, 24 & 32.
;For each digit, the segments are connected as:
; Seg A --> seg(8*n + 1)
; Seg B --> seg(8*n + 2)
; Seg C --> seg(8*n + 3)
; Seg D --> seg(8*n + 4)
; Seg E --> seg(8*n + 5)
; Seg F --> seg(8*n + 6)
; Seg G --> seg(8*n + 7)
;where n = 0, 1, 2 and 3 for MSD, 3rdSD, 2ndSD and LSD respectively.
;The firmware uses the values in registers:
; MSD, THRDSD, SCNDSD and LSD to determine the values to be
;pulsed to the AY0438.
;In this example, a pushbutton connected to PORTB bit 7
;is checked periodically to see if it has been pressed. If so,
;the LCD values in locations MSD to LSD are updated.
;*************************************************************************
list p=16c71,f=inhx8m
;
;
MSD equ 0x20
THRDSD equ
0x21
SCNDSD equ
0x22
LSD equ 0x23
count equ
0x24
temp equ
0x25
PORTB equ
0x06
#define CLK
PORTB,0
#define DATAIN PORTB,1
#define LOAD PORTB,2
#define UPDATELCD PORTB,7
w equ 0
STATUS equ
0x03
C equ 0
RP0 equ 5
OPTION equ
0x81
RBPU equ
7
PCL equ 0x02
PCLATH equ
0x0A
;
;
org 0
goto start
org 0x10
;
;This DecodeValue table must reside in page 0 for this program to work
;
DecodeValue
addwf PCL
retlw B'00111111'
;decode for 0
retlw B'00000110'
;decode for 1
retlw B'01011011'
;decode for 2
retlw B'01001111'
;decode for 3
retlw B'01100110'
;decode for 4
retlw B'01101101'
;decode for 5
© 1995 Microchip Technology Inc.
DS70010I-page 5
5 Page 
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03/01/02
2002 Microchip Technology Inc.
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| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet AY0438.PDF ] | |
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