as2591 austriamicrosystems, as2591 Datasheet
as2591
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as2591 Summary of contents
Page 1
... VOLTAGE LCD CONTROL Rev. 1.0 General Description The AS2591 is a CMOS integrated circuit for driving a liquid crystal display intended for use in telephones. The driver can be used with 12- or 16-digit LCDs. The 2-wire serial interface is compatible with the AS2525, single-chip handsfree telephone circuit. ...
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... Oscillator Pins Oscillator pins for connection of a 32.768 kHz crystal. LCD Reference Voltage This is the input pin for setting the internal LCD reference voltage (see also Figure 4: Supply arrangement). Backplane Outputs Ouput pins for driving backplanes of LCD. Page 2 AS2591 May 1999 ...
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... S2_14 S1_14 S2_15 Rev. 1.0 Description Segment Outputs Output pins for driving segments of LCD. AI: AO: AI/ AS2591 Figure 2: Pin configuration Page 3 AS2591 Analogue Input Analogue Output Analogue Input/output S2_4 S1_3 S2_3 S1_2 S2_2 S1_1 S2_1 S1_0 S2_0 COM4 COM3 May 1999 ...
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... Preliminary Typical Application See also application note AN525 for further information. Rev. 1.0 Figure 3: Typical Application Page 4 AS2591 May 1999 ...
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... Preliminary Functional Description AS2591 is a CMOS mixed-mode integrated circuit for driving LCDs with 4 backplanes and segments providing 7-segment digits and 12 symbols. The device is controlled via a simple 2-wire bus and a chip-select signal. The device also includes an elapse-time counter which is started 5 seconds after power-up and incremented every second ...
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... Bell off. Indicates that ringer has been turn off. Shift; indicates that shift key has been pressed. Remains on untill next key pressure Not used Indicates that last number redial has been activated Indicates program mode LSB Figure 5: Frame of serial interface Page 6 AS2591 May 1999 ...
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... Display ON (resets the off timer Rev. 1.0 blinking frequency 0.67 Hz 1.00 Hz delay time 5 seconds no delay contrast voltage ND low 00 middle 01 high 10 not allowed 11 Page 7 AS2591 enabled/disabled blinking static off number of digits 12 digits 16 digits not allowed not allowed May 1999 ...
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... The symbols in bold are always enabled and other symbols can be enabled through the serial interface. Symbols will be displayed independently from selecting the upper bank of the 32 digit buffer to be displayed. The AS2591 incorporates a buffer for 32 digits. Digits are entered from the most right position and shifted left by new entries (see also Table 2: Commands). ...
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... Typical figures are at 25°C and are for design aid only; not guaranteed and not subject to production testing. Rev. 1.0 Conditions Conditions Unloaded Idle mode, oscillator not running V = 3.27V LCD Contrast voltage low Contrast voltage middle Contrast voltage high Page 9 AS2591 0. Min. Typ. Max. Units 3 ...
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... Trademarks Registered®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. Austria Mikro Systeme Int. AG reserves the right to change or discontinue this product without notice. Rev. 1.0 Conditions Page 10 AS2591 Min. Typ. Max. Units 4. ...