AY0438-I/L Microchip Technology, AY0438-I/L Datasheet
AY0438-I/L
Specifications of AY0438-I/L
Available stocks
Related parts for AY0438-I/L
AY0438-I/L Summary of contents
Page 1
... 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 LCD segments. It needs only three control lines due to its serial input construction ...
Page 2
... AY0438 FIGURE 1: PIN DESCRIPTIONS Pin # (PDIP Only 3-29, 32, 33, 37-39 Seg 1- Data Out 36 40 FIGURE 2: BLOCK DIAGRAM Data in 32-bit Static Shift Register Clock Load 32 Latches 32 Segment Drivers LCD AC LCD Generator FIGURE 4: TIMING DIAGRAM CLOCK 1 START Data in Data out Load 1.0 OPERATION: 1 ...
Page 3
... AY0438 devices 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 LCD input of the second AY0438. The backplane output of the second device is then used to drive the backplane of the LCD module. ...
Page 4
... DS70010I-page 4 1.5 Interfacing to a LCD Module and PIC16CXX Device 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 A ...
Page 5
... MSD, 3rdSD, 2ndSD and LSD respectively. ;The firmware uses the values in registers: ; MSD, THRDSD, SCNDSD and LSD ;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. ...
Page 6
... AY0438 retlw B'01111101' retlw B'00000111' retlw B'01111111' retlw B'01101111 start clrf PORTB bsf STATUS,RP0 movlw B'11111000' movwf PORTB bcf OPTION,RBPU bcf STATUS,RP0 wait btfsc UPDATELCD goto wait bcf LOAD movf LSD,w clrf PCLATH call DecodeValue call Send8 movf SCNDSD,w call DecodeValue ...
Page 7
... Max Units DC — 1.5 MHz 150 — — nsec Data change to Clk falling edge 50 — — nsec 175 — — nsec — — 500 nsec C AY0438 to V +0. +0.3V DD Units Conditions V A LCD OSC < 15 kHz A LCD OSC < 100 3. ...
Page 8
... AY0438 NOTES: DS70010I-page 8 1995 Microchip Technology Inc. ...
Page 9
... 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: Temperature Range: Device: Sales and Support Products supported by a preliminary Data Sheet may possibly have an errata sheet describing minor operational differences and recommended workarounds ...
Page 10
... Serialized Quick Turn Programming (SQTP 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 ...
Page 11
... Korea Microchip Technology Korea 168-1, Youngbo Bldg. 3 Floor Samsung-Dong, Kangnam-Ku Seoul, Korea 135-882 Tel: 82-2-554-7200 Fax: 82-2-558-5934 Singapore Microchip Technology Singapore Pte Ltd. 200 Middle Road #07-02 Prime Centre Singapore, 188980 Tel: 65-6334-8870 Fax: 65-6334-8850 Taiwan Microchip Technology Taiwan 11F-3, No. 207 ...