AY0438T-I/L [MICROCHIP]
LCD DRIVER 44LD, -40C to +85C, 44-PLCC, T/R;
| 型号： | AY0438T-I/L |
| 厂家： | 
MICROCHIP |
| 描述： | LCD DRIVER 44LD, -40C to +85C, 44-PLCC, T/R 驱动 CD 接口集成电路 |
| 文件： | 总11页 (文件大小：87K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AY0438
32-Segment CMOS LCD Driver
FEATURES
PIN CONFIGURATION
40-Lead Dual In-line
• Drives up to 32 LCD segments of arbitrary config-
uration
VDD
LOAD
1
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
• CMOS process for: wide supply voltage range,
low- power operation, high-noise immunity, wide
temperature range
2
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
3
4
5
• CMOS and TTL-compatible inputs
• Electrostatic discharge protection on all pins
• Cascadable
6
DATA OUT
DATA IN
SEG 4
SEG 5
LCDΦ
7
8
9
• On-chip oscillator
10
11
12
13
14
15
16
17
18
19
20
• Requires only three control lines
BP
SEG 6
SEG 7
SEG 8
SEG 9
SEG 10
SEG 11
SEG 12
SEG 13
SEG 14
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.
44 PLCC
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.
SEG 29
NC
DATA OUT
7
8
9
39
38
37
36
35
34
33
32
31
30
29
SEG 28
SEG 27
SEG 26
SEG 25
SEG 24
SEG 23
SEG 22
SEG 21
SEG 20
SEG 19
DATA IN
SEG 4
SEG 5
LCDΦ
BP
SEG 6
SEG 7
SEG 8
NC
10
11
12
13
14
15
16
17
AY0438
The AY0438 is available in 40-lead dual in-line plastic
and 44-lead PLCC packages. Unpackaged dice are
also available.
1995 Microchip Technology Inc.
DS70010I-page 1
AY0438
FIGURE 1: PIN DESCRIPTIONS
Pin # (PDIP Only)
Name
Direction
Description
1
VDD
Load
-
Supply voltage
Latch data from registers
Direct drive outputs
2
Input
3-29, 32, 33, 37-39
Seg 1-32
BP
Output
Output
Input
30
31
34
35
36
40
Backplane drive output
Backplane drive input
Data input to shift register
Data output from shift register
Ground
LCDΦ
Data In
Data Out
VSS
Input
Output
Ground
Input
Clock
System clock input
FIGURE 2: BLOCK DIAGRAM
FIGURE 3: BACKPLANE AND SEGMENT
OUTPUT
Data in
Data out
32-bit Static Shift Register
32 Latches
Clock
SEG On
Backplane
SEG Off
Load
32 Segment Drivers
32 Outputs
Backplane
output
LCD AC
Generator
LCDΦ
FIGURE 4: TIMING DIAGRAM
1/f
CLOCK
1
31
32
START
Data in
SEG 32
SEG 2
SEG 1
tDS
tDH
Data out
Load
tPD
tPW
enabled or visible, i.e. the output at Segment Output is
180° out-of-phase with the Backplane output
(Figure 3).
1.0
OPERATION:
1.1
Data In and Clock
1.2
Load
The shift register shifts and outputs on the falling edge
of the clock. Every clock falling edge does a logical left
shift. As an example, if 32 clock pulses are supplied as
in Figure 4, then the data input at the first clock will out-
put at SEG 32, and the last data input (# 32) will output
at SEG 1 when a LOAD signal is enabled (Figure 2). It
is recommended that a complete 32 bit transfer be
done every time the outputs are updated. A logic 1 at
the Data In causes the corresponding segment to be
A logic 1 at the Load input (Figure 2) causes the paral-
lel load of the data in the shift register into the latches
that control the segment drivers. If the Load signal is
tied high, then the latches become transparent and the
segment drivers are always connected to the shift reg-
isters.
DS70010I-page 2
1995 Microchip Technology Inc.
AY0438
1.3
LCDφ
FIGURE 5: OSCILLATOR FREQUENCY
GRAPH (TYPICAL @ 25°C)
LCDφ can be driven by an external signal or by con-
necting a capacitor between LCDφ and ground (GND),
which will enable the on-chip oscillator required to gen-
erate the backplane output voltage. Figure 5 shows the
relationship between capacitance value and output fre-
quency. Leaving the LCDφ input unconnected is not
recommended. When driven by an external clock, the
backplane output is in phase with the input clock.When
cascading two AY0438 devices (Figure 6 and
Figure 7), the backplane output can be generated
using a capacitor to GND on the first AY0438. This
backplane output can then be connected to the LCDφ
input of the second AY0438. The backplane output of
the second device is then used to drive the backplane
of the LCD module.
140
120
100
80
60
40
0
20
40
60
80
100
120
CL (pF)
FIGURE 6: CASCADING TWO AY0438 DEVICES
Data
in
Data
out
Data
in
Data
out
32-bit Static Shift Register
32 Latches
Clock
Load
32-bit Static Shift Register
32 Latches
Clock
Load
32 Segment Drivers
32 Segment Drivers
1 to 32
Outputs
33 to 64
Outputs
LCDΦ
LCD AC
Generator
LCD AC
Generator
Backplane
output
Backplane
output
LCDΦ
Clock
Load
FIGURE 7: CASCADE TIMING DIAGRAM
1/f
63
CLOCK
1
64
START
Data in
SEG 64
SEG 2
SEG 1
tDS
tDH
Data out
Load
tPD
tPW
1995 Microchip Technology Inc.
DS70010I-page 3
AY0438
1.4
General
1.5
Interfacing to a LCD Module and
PIC16CXX Device
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 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.
FIGURE 8: INTERFACING TO A LCD MODULE AND PIC16CXX DEVICE
SEG A
AY0438
SEG1
LCD
Backplane
SEG F
SEG G
SEG E
A
G
SEG7
SEG6
SEG5
B
C
F
E
D
SEG D
SEG C
SEG B
PIC16CXX
SEG4
SEG3
SEG2
RB0
Clock
7
7
7
Data In
Load
SEG9-15
SEG19-23
SEG25-31
Backplane
RB1
RB2
RB7
LCDΦ
EXAMPLE 1:
EXAMPLE CODE
;*************************************************************************
;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:
;
;
;
;
;
PORTB bit 0 --> CLK
PORTB bit 1 --> DATA IN
PORTB bit 2 --> LOAD
;The LCD module is connected to the AY0438 as follows:
;
;
;
;
;
Most Significant digit --> seg1 to seg7
3rd Significant digit
2nd Significant digit
--> seg9 to seg15
--> seg17 to seg 23
Least Significant digit --> seg25 to seg 31
DS70010I-page 4
1995 Microchip Technology Inc.
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
THRDSD equ
SCNDSD equ
equ
0x20
0x21
0x22
0x23
0x24
0x25
0x06
PORTB,0
LSD
equ
equ
equ
equ
count
temp
PORTB
#define CLK
#define DATAIN PORTB,1
#define LOAD PORTB,2
#define UPDATELCD PORTB,7
w
equ
0
STATUS equ
0x03
0
5
C
equ
equ
RP0
OPTION equ
0x81
7
0x02
0x0A
RBPU
PCL
equ
equ
PCLATH equ
;
;
org
goto
org
;
0
start
0x10
;This DecodeValue table must reside in page 0 for this program to work
;
DecodeValue
addwf
retlw
retlw
retlw
retlw
retlw
retlw
PCL
B'00111111'
B'00000110'
B'01011011'
B'01001111'
B'01100110'
B'01101101'
;decode for 0
;decode for 1
;decode for 2
;decode for 3
;decode for 4
;decode for 5
1995 Microchip Technology Inc.
DS70010I-page 5
AY0438
retlw
retlw
retlw
retlw
;
B'01111101'
B'00000111'
B'01111111'
B'01101111'
;decode for 6
;decode for 7
;decode for 8
;decode for 9
;
start
clrf
bsf
PORTB
STATUS,RP0
B'11111000'
PORTB
OPTION,RBPU
STATUS,RP0
;set portb 0,1&2 as outputs
movlw
movwf
bcf
;
;
/
/
;enable pull-up for switch
bcf
wait
btfsc
goto
bcf
UPDATELCD
wait
LOAD
LSD,w
PCLATH
DecodeValue
Send8
SCNDSD,w
DecodeValue
Send8
THRDSD,w
DecodeValue
Send8
;see if update switch is low
;no then wait
;make sure load is disabled
;get least significant value
;PCH = 0
movf
clrf
call
call
movf
call
call
movf
call
call
movf
call
call
bsf
;decode the value
;serially output the seg values
;get 2nd significant digit
;decode it
;serially output it
;get 3rd significant digit
;decode it
MSD,w
DecodeValue
Send8
LOAD
LOAD
;get Most significant value
;decode it
;serially send it
;toggle the LOAD line
;to enable the latches
bcf
KeyReleased
btfss
goto
goto
;
UPDATELCD
KeyReleased
wait
;wait for key to be released
;repeat loop.
;Send8, sends the 8 bits in the W register
Send8
movwf
movlw
movwf
temp
.8
count
;save in temp
;init count
;to 8
sendloop
bcf
rrf
btfsc
bsf
bsf
DATAIN
temp
STATUS,C
DATAIN
CLK
;make sure DATAIN is low
;rotate value through carry
;if bit clear then skip
;else set data bit
;toggle clock
bcf
CLK
;
/
decfsz count
;see if 8 done
;no then do all
;else return
goto
sendloop
return
end
DS70010I-page 6
1995 Microchip Technology Inc.
AY0438
2.0
ELECTRICAL CHARACTERISTICS
Maximum Ratings*
VDD..............................................................................................................................................................-0.3V to +12V
Inputs (CLK, Data In, Load) ................................................................................................................. VCC to VDD +0.3V
LCDΦ Input ........................................................................................................................................ -0.3V to VDD +0.3V
Power Dissipation.................................................................................................................................................250 mW
Storage Temperature............................................................................................................................... -65˚C to +125˚C
Operating Temperature Industrial.............................................................................................................. -40˚C to +85˚C
* Exceeding these ratings could cause permanent damage to the device. This is a stress rating only and functional
operation of this device at these conditions is not implied. Operating ranges are specified in Standard Conditions.
Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Data labeled “typical” is presented for design guidance only and is not guaranteed.
TABLE 2: DC CHARACTERISTICS
VDD = +5V unless otherwise noted, TA = 40°C to +85°C
Characteristics
Supply Voltage
Sym
Min
Typ
Max
Units
Conditions
VDD
IDD
+3.0
—
25
13
—
+8.5
60
V
Supply Current
—
µA LCDΦ OSC < 15 kHz
—
30
µA LCDΦ OSC < 100 Hz
Input High Level
Input Low Level
VIH
VIL1
VIL2
IL
0.5 VDD
VDD
V
Clock
Data,
Load
0
—
0.1 VDD
0.1 VDD
±10
V
V
3.0V ≤ VDD ≤ 8.5V
3.0V ≤ VDD ≤ 8.5V
0
—
Input Leakage Current
Input Capacitance
—
0.01
—
µA VIN = 0V and +5.0V
CI
—
5.0
pF
V
VDD = +5.0V
IOH = -100 µA
IOL = 100 µA
Segment Output Voltage
VOH
VOL
VIN
VIL
IL
0.8 VDD
—
VDD
0
0.9 VDD
0
—
0.1 VDD
VDD
V
LCDΦ Input High Level
LCDΦ Input Low Level
LCDΦ Input Leakage
—
V
—
0.1 VDD
10
V
—
—
µA VIN = 0V and +5.0V
VDD = +5.0V
TABLE 3: AC CHARACTERISTICS
Characteristics
Clock Rate
Sym
Min
Typ
Max
Units
Conditions
f
DC
150
50
—
—
—
—
—
1.5
—
MHz
50% duty cycle
Data Set-up Time
Data Hold Time
tDS
tDH
tPW
tPD
nsec Data change to Clk falling edge
—
nsec
Load Pulse Width
Data Out Prop. Delay
175
—
—
nsec
500
nsec CL = 55 pF
1995 Microchip Technology Inc.
DS70010I-page 7
AY0438
NOTES:
DS70010I-page 8
1995 Microchip Technology Inc.
AY0438
AY0438 Product Identification System
To order or to obtain information, e.g., on pricing or delivery, please use the listed part numbers, and refer to the factory or the listed
sales offices.
PART NO.
X /XX
Package:
P
L
S
=
=
=
Plastic DIP
PLCC
Die in Waffle Pack
Temperature
Range:
-
I
=
=
0˚C to +70˚C
40˚C to +85˚C
Device:
32 Segment LCD Driver
Sales and Support
Products supported by a preliminary Data Sheet may possibly have an errata sheet describing minor operational differences and
recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1.
2.
3.
Your local Microchip sales office.
The Microchip Corporate Literature Center U.S. FAX: (602) 786-7277
The Microchip’s Bulletin Board, via your local CompuServe number (CompuServe membership NOT required).
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
For latest version information and upgrade kits for Microchip Development Tools, please call 1-800-755-2345 or 1-602-786-7302.
DS70010I-page 9
1995 Microchip Technology Inc.
®
Note the following details of the code protection feature on PICmicro MCUs.
•
•
The PICmicro family meets the specifications contained in the Microchip Data Sheet.
Microchip believes that its family of PICmicro microcontrollers is one of the most secure products of its kind on the market today,
when used in the intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowl-
edge, require using the PICmicro microcontroller in a manner outside the operating specifications contained in the data sheet.
The person doing so may be engaged in theft of intellectual property.
•
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable”.
•
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of
our product.
If you have any further questions about this matter, please contact the local sales office nearest to you.
Information contained in this publication regarding device
applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products as critical com-
ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con-
veyed, implicitly or otherwise, under any intellectual property
rights.
Trademarks
The Microchip name and logo, the Microchip logo, FilterLab,
KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER,
PICSTART, PRO MATE, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip Tech-
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dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, microPort,
Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM,
MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode
and Total Endurance are trademarks of Microchip Technology
Incorporated in the U.S.A.
Serialized Quick Turn Programming (SQTP) is a service mark
of Microchip Technology Incorporated in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2002, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received QS-9000 quality system
certification for its worldwide headquarters,
design and wafer fabrication facilities in
Chandler and Tempe, Arizona in July 1999. The
Company’s quality system processes and
procedures are QS-9000 compliant for its
PICmicro® 8-bit MCUs, KEELOQ® code hopping
devices, Serial EEPROMs and microperipheral
products. In addition, Microchip’s quality
system for the design and manufacture of
development systems is ISO 9001 certified.
2002 Microchip Technology Inc.
M
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No. 11, O’Shaugnessey Road
Bangalore, 560 025, India
Tel: 91-80-2290061 Fax: 91-80-2290062
Berkshire, England RG41 5TU
Tel: 44 118 921 5869 Fax: 44-118 921-5820
03/01/02
2002 Microchip Technology Inc.
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