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FEATURES * * *
SA8807A 96 SEGMENT LIQUID CRYSTAL DISPLAY DRIVER SERIAL (SPI) INTERFACE
* * External contrast control Low power CMOS
Drives up to 96 segments Serial (SPI) interface with Read/Write capability Operates over a wide temperature range
DESCRIPTION The SAMES SA8807A Liquid Crystal Display (LCD) Driver is capable of driving up to 96 LCD segments and is designed for displays having 3 or 4 track multiplexed backplanes. The SA8807A includes an on-chip oscillator. The data exchange is carried out via the Serial Peripheral Interface (SPI). This LCD driver is ideal for any microcontroller based system requiring a liquid crystal display of up to 12 digits. The SA8807A 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
V DD VS[20] VS[21] VS[22] VS[23] SCK MOSI MISO CE RES END CLK GND M3 VI NC VR[0] VR[1] VR[2] VR[3]
DR-00580
VS[19] VS[18] VS[17] VS[16] VS[15] VS[14] VS[13] VS[12] VS[11] VS[10] VS[9] VS[8] VS[7] VS[6] VS[5] VS[4] VS[3] VS[2] VS[1] VS[0]
Package: DIP-40
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4076 PDS039-SA8807-001 REV. C 11-09-95
SA8807A PIN CONNECTIONS
VS[14] VS[13] VS[12] VS[11] VS[10] VS[9] N.C. VS[8] VS[7] VS[6] VS[5]
VS[15] VS[16] VS[17] VS[18] VS[19] N.C. V DD VS[20] VS[21] VS[22] VS[23]
VS[4] VS[3] VS[2] VS[1] VS[0] N.C. VR[3] VR[2] VR[1] VR[0] N.C.
MOSO
SCK MOSI
DR-00581
GND M3
CE RES END
N.C. CLK
Package: PLCC-44 BLOCK DIAGRAM
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V1
SA8807A ABSOLUTE MAXIMUM RATINGS* Parameter Symbol Supply Voltage V DD -VSS Current on any pin IPIN Storage Temperature Operating Temperature TSTG TO
Min -0.3 -150 -40 -25
Max 6.0 +150 +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
#
Symbol VDD-VSS IDD VON VOFF
Min 3.0
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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SA8807A SERIAL INTERFACE TIMING Ref No 1 2 3 4 5 6 7 8 Characteristic Chip Enable set-up time Chip Enable clock hold time Clock width high Clock width low Data In to clock set-up time Clock to Data propagation delay Chip Disable to output high Z Data In after clock hold time Limits (All Types) VDD = 3.3V VDD = 5V Min Max Min Max 200 250 400 400 200 200 200 200 100 100 125 200 200 100 100 100 Unit ns ns ns ns ns ns ns ns
6 MIS0
5. 00
7
5. 00
SCK
CE
DR-00846
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SA8807A PIN DESCRIPTION Pin Pin Designation Description PLCC-44 DIP-40 26 13 GND Ground 13 1 VDD Positive Supply Voltage 18 6 SCK (SPI) Serial clock input 19 7 MOSI (SPI) Master Out: Slave In 20 8 MISO (SPI) Master In: Slave Out 21 9 CE Chip Enable input 22 10 RES Reset input 23 11 END Divider Enable 25 12 CLK Oscillator or clock input 27 14 M3 3 / 4 Backplane enable input 28 15 V1 LCD Voltage input (Contrast) 35 21 VS[0] LCD segment driver outputs 36 22 VS[1] 37 23 VS[2] 38 24 VS[3] 39 25 VS[4] 40 26 VS[5] 41 27 VS[6] 42 28 VS[7] 43 1 2 3 4 5 6 7 8 9 10 11 29 30 31 32 33 34 35 36 37 38 39 40 VS[8] VS[9] VS[10] VS[11] VS[12] VS[13] VS[14] VS[15] VS[16] VS[17] VS[18] VS[19] sames
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SA8807A PIN DESCRIPTION (Continued) Pin Pin Designation Description PLCC-44 DIP-40 14 2 VS[20] LCD segment driver outputs 15 3 VS[21] 16 4 VS[22] 17 5 VS[23] 30 17 VR[0] LCD row driver outputs 31 18 VR[1] 32 19 VR[2] 33 20 VR[3] 29 16 NC Not connected 12 NC 24 NC 34 NC 44 NC FUNCTIONAL DESCRIPTION The SA8807A is a CMOS Liquid Crystal Driver integrated circuit for displays having 3 or 4 track multiplexed backplanes and up to 96 LCD segments. Data exchange is performed through a Serial Peripheral Interface (SPI). 1. Serial Peripheral (SPI) Interface The SPI Interface is a 4 wire interface. The device transmits the data to the Master via MISO (Master In, Slave Out). Data from the Master is received through MOSI (Master Out, Slave In). The data is always synchronised to the Serial Clock (SCK), which is supplied from the Master. CE is a active high signal, the rising edge defining the start of a transfer procedure. The transfer procedure is terminated with the falling edge of CE. Diagram 1 illustrates the relationships between Clock, Data and Chip Enable signals. The SA8807A determines the clock polarity during the low to high transition of the CE signal.
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SA8807A
Diagram 1
2.
Addressing and Read/Write Mode Select To access the SA8807A, a control byte has to be received first (after CE goes active). This byte contains the information to initiate either a Read or Write mode and an address. The following bytes contain data until CE becomes inactive. Address/Control Byte: The Address and Control Byte is the first byte sent after CE goes active. To send another address, CE must first go inactive before going active again. If the CE remains high, the device automatically increments the address, for the following byte. W/R = "1" One or more write cycles to be sent. W/R = "0" Inititates one or more read cycles. A5 - A0: Address 5 to Address 0 selects the 6-bit HEX Address of RAM. (See LCD Character Mapping) SCK may be either polarity.
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SA8807A
Read/Write Data: The Read/Write Data follows the Address/Control byte. SCK may be either polarity.
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SA8807A 3. LCD Display The SA8807A LCD driver is capable of driving a 3 or 4 backplane, 12 digit (7 segment) display, plus decimal points. In the case of a 4 back plane display, typically the most significant digit is addressed by columns VS[22] and VS[23] 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:
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. A segment is switched on when the corresponding difference between backplane VR[ ] and segment VS[ ] outputs is VDD, and switched off when switched to 1/3 VDD. The voltage is alternated to avoid a DC voltage on the LCD (See Diagram 2). The backplane multiplex rate is determined by the clock/oscillator frequency on the CLK input.
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SA8807A Diagram 2: LCD Driving Signals
4.
LCD Character Mapping The device contains 12 x 8 bit display memory. Each byte is divided into 2 x 4 bits, for driving two adjacent segment outputs. The lower four bits (3, 2, 1 & 0) contain the data for segments VS[0], VS[2], ...... VS[20] and VS[22]. The upper four bits (7, 6, 5 & 4) contain the data segments VS[1], VS[3], ...... VS[21] and VS[23]. 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 0-4* 0-5 0-6 0-7 1-0 1-1 1-2 1-3 1-4 1-5 1-6 1-7 ........ ........ ........ ........ ........ VS[20] VS[21] VS[22] VS[23] 10-0 10-1 10-2 10-3 10-4 10-5 10-6 10-7 11-0 11-1 11-2 11-3 11-4 11-5 11-6 11-7
Note: A '1' switches the corresponding segment on. * The address number and bit number of the byte is given, e.g. 0-4 is address 0 and bit 4 (LSB). In 3-backplane mode, data corresponsing to VR[3] (bit 3 and 7) is unused.
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SA8807A 5. 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 by 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 backplane multiplex rate is f/8 for 4-backplane mode and f/6 for 3-backplane mode. TYPICAL APPLICATION The Application Circuit (Figure 1) shows the connections for a typical application when using a 12 digit (7 segment) display, plus decimal points.
6.
7.
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SA8807A Figure 1: LCD Driver Application
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SA8807A ORDERING INFORMATION Part Number Package SA8807APA DIP-40 SA8807AFA PLCC-44
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SA8807A
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
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