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FEATURES
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SA8806A 64 SEGMENT LIQUID CRYSTAL DISPLAY DRIVER PARALLEL INTERFACE
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Drives up to 64 segments Standard parallel interface Operates over a wide temperature range
External contrast control Low power CMOS
DESCRIPTION The SAMES SA8806A Liquid Crystal Display (LCD) Driver is capable of driving up to 64 LCD segments and is designed for displays having 4 track multiplexed backplanes. The SA8806A includes an on-chip oscillator. The device may be programmed from a standard P or C Bus. This LCD driver is ideal for any -Controller based system requiring up to an 8 digit LCD display. The SA8806A integrated circuit is available in both 40 pin dual-in-line plastic (DIP-40), as well as 44 pin plastic leaded chip carrier (PLCC-44) package types.
PIN CONNECTIONS
VDD D[3] D[2] D[1] D[0] AD[3] AD[2] AD[1] AD[0] WR RD CS RES CLK EN GND VR[3] VR[2] VR[1] VR[0]
DR-00562
VI1 VI1/3 VI2/3 VS[0] VS[1] VS[2] VS[3] VS[4] VS[5] VS[6] VS[7] VS[8] VS[9] VS[10] VS[11] VS[12] VS[13] VS[14] VS[15] N.C
Package: DIP-40
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4072 PDS039-SA8806-001 REV. D 12-09-1995
SA8806A PIN CONNECTIONS
N.C. VS[8] VS[9] VS[10] VS[11] VS[2] VS[3] VS[4] VS[5] VS[6] VS[7]
VS[1] VS[0] VI2/3 VI1/3 VI1 N.C. V DD D[3] D[2] D[1] D[0]
VS[12] VS[13] VS[14] VS[15] N.C N.C. VR[0] VR[1] VR[2] VR[3] GND
AD[3] AD[2] AD[1] AD[0] WR RD
DR-00563
Package: PLCC-44 BLOCK DIAGRAM
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N.C. CS RES CLK EN
SA8806A ABSOLUTE MAXIMUM RATINGS* Parameter Symbol Supply Voltage V DD -VSS Current on any pin IPIN Storage Temperature Operating Temperature TSTG TO
Min -0.3 -100 -40 -25
Max 6.0 +100 +125 +85
Unit V mA C C
* Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only. Functional operation of the device at these or any other condition above those indicated in the operational sections of this specification, is not implied. Exposure to Absolute Maximum Ratings for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS (Over the temperature range -10C to +70C#, V DD = 5V, VSS = 0V unless otherwise specified.) Parameter Supply Voltage Supply Current LCD ON Voltages LCD OFF Voltages
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Symbol VDD-VSS IDD VON VOFF
Min 4.5
Typ 5.0
Max Unit 5.5 100 V A V V
Condition
VDD & VSS 1/3V DD & 2/3 V DD
Extended Operating Temperature Range available on request.
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SA8806A PIN DESCRIPTION Pin Pin Designation Description PLCC-44 DIP-40 29 16 GND Ground 13 1 VDD Positive Supply Voltage 17 5 D[0] Data inputs/outputs 16 4 D[1] 15 3 D[2] 14 2 D[3] 21 9 AD[0] Data address inputs 20 8 AD[1] 19 7 AD[2] 18 6 AD[3] 22 10 WR Write Enable input, active low 23 11 RD Read Enable input, active low 25 12 CS Chip Select input, active low 26 13 RES Reset input, active low 27 14 CLK Oscillator Input 8 37 VS[0] LCD segment driver outputs 7 36 VS[1] 6 35 VS[2] 5 34 VS[3] 4 33 VS[4] 3 32 VS[5] 2 31 VS[6] 1 30 VS[7] 43 29 VS[8] 42 28 VS[9] 41 27 VS[10] 40 26 VS[11] 39 25 VS[12] 38 24 VS[13] 37 23 VS[14] 36 22 VS[15]
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SA8806A PIN DESCRIPTION (Continued) Pin Pin Designation Description PLCC-44 DIP-40 33 20 VR[0] LCD backplane driver outputs 32 19 VR[1] 31 18 VR[2] 30 17 VR[3] 28 15 EN LCD Voltage Divider Enable input, active low 11 40 VI1 Optional external LCD voltage inputs 10 39 VI1/3 9 38 VI2/3 34 21 NC Not connected 12 NC 24 NC 35 NC 44 NC FUNCTIONAL DESCRIPTION The SA8806A is a CMOS Liquid Crystal Display Driver integrated circuit for displays, having 4 track multipexed backplanes and up to 64 LCD segments. The integrated circuit has a parallel interface, with external contract control and a low power mode. 1. Parallel Interface Read Mode: With CS and RD both active (low), the data corresponding to the selected address, is switched to the output. The Read cycle timing diagram is given below: Diagram 1: Read Cycle
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SA8806A Write Mode: With CS and WR both active (low), the data corresponding to the address selected, is latched into memory. The Write cycle timing diagram is given below: Diagram 2: Write Cycle
2.
LCD Display The SA8806A LCD Driver is capable of driving a 4 backplane, 8 digit (7 segment) display, plus decimal points. The most significant digit is addressed by columns VS[14] and VS[15] and the least significant digit; by VS[0] and VS[1]. The display segments addressed via the column outputs are given in a typical configuration below:
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SA8806A The data in memory is constantly being displayed on the liquid crystal display. New data is displayed as soon as it is latched into memory. When a high level (+5V) on a backplane driver output corresponds with a low level (0V) on a segment driver output (or vice versa), the LCD segment to which they are connected, will be activated (see Diagram 3). The backplane multiplex rate is determined by the clock frequency on the CLK input. Diagram 3: LCD Driving Signals
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SA8806A 3. LCD Character Mapping The device has 16 address locations, A0 - A15 which correspond to VS[0] - VS[15]. Each location contains 4 bits, D[3] to D[0] which correspond to VR[3] - VR[0]. The mapping is detailed in the table below: SEG VR[0] VR[1] VR[2] VR[3] VS[0] VS[1] VS[2] VS[3] 0-0 0-1 0-2 0-3 1-0* 1-1 1-2 1-3 2-0 2-1 2-2 2-3 3-0 3-1 3-2 3-3 ........ ........ ........ ........ ........ VS[12] VS[13] VS[14] VS[15] 12-0 12-1 12-2 12-3 13-0 13-1 13-2 13-3 14-0 14-1 14-2 14-3 15-0 15-1 15-2 15-3
Note: A '1' switches the corresponding segment on. * The address number and bit number of the byte is given, e.g. 1-0 is address 1 and bit 0 (LSB). 4. On-Chip LCD Voltage Divider Disable The integrated divider for the LCD voltages can be disabled by applying a high level on the EN input (EN = 1). Contrast Setting The contrast may be adjusted in two ways: An external resistor divider supplying the LCD voltage inputs VI1, VI1/3, VI2/3, with the internal divider disabled as described in paragraph 4. Applying an external LCD voltage on input V1, with the internal voltage divider activated. Oscillator The on-chip oscillator circuit requires one external capacitor for operation. The capacitor value is calculated as follows: C = 7F.1Hz/f f = Required oscillator frequency The multiplex rate is 64 times lower than the clock frequency. TYPICAL APPLICATION The Application Circuit (Figure 1) shows the connections for a typical application utilising an 8 digit (7 segment) display, plus decimal points.
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SA8806A Figure 1: Application Circuit
ORDERING INFORMATION Part Number Package SA8806APA DIP-40 SA8806AFA PLCC-44 sames
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SA8806A
Disclaimer: The information contained in this document is confidential and proprietary to South African MicroElectronic Systems (Pty) Ltd ("SAMES") and may not be copied or disclosed to a third party, in whole or in part, without the express written consent of SAMES. The information contained herein is current as of the date of publication; however, delivery of this document shall not under any circumstances create any implication that the information contained herein is correct as of any time subsequent to such date. SAMES does not undertake to inform any recipient of this document of any changes in the information contained herein, and SAMES expressly reserves the right to make changes in such information, without notification, even if such changes would render information contained herein inaccurate or incomplete. SAMES makes no representation or warranty that any circuit designed by reference to the information contained herein, will function without errors and as intended by the designer.
Any Sales or technical questions may be posted to our e-mail address below: energy@sames.co.za For the latest updates on datasheets, please visit out web site: http://www.sames.co.za South African Micro-Electronic Systems (Pty) Ltd P O Box 15888, 33 Eland Street, Lynn East, 0039 Koedoespoort Industrial Area, Republic of South Africa, Pretoria, Republic of South Africa Tel: Fax:
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012 333-6021 012 333-8071 sames
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