PCF1303T Datasheet | NXP Semiconductors

INTEGRATED CIRCUITS DATA SHEET PCF1303T 18-element bar graph LCD driver Product specification File under Integrated Circuits, IC01 November 1986 Philips Semiconductors Product specification 18-element bar graph LCD driver GENERAL DESCRIPTION The PCF1303T is an 18-element bar graph LCD driver with linear relation to control voltage (Vc) when in pointer or thermometer mode. Fig.1 Block diagram. PACKAGE OUTLINE PCF1303T: 28-lead mini-pack; plastic (SO28; SOT136A); SOT136-1; 1996 September 02. November 1986 Philips Semiconductors Product specification 18-element bar graph LCD driver PIN DESCRIPTION PIN NO. 1 4 5 6 to 23 24 25 26 27 28 SYMBOL Vosc I1 VSS Q1 to Q18 QR Vc Vref min Vref max VDD positive supply voltage NAME AND FUNCTION oscillator pin mode select input ground (0 V) segment outputs back-plane output control voltage reference voltage inputs FUNCTION TABLE I1 L H H = HIGH voltage level L = LOW voltage level pointer thermometer MODE (1) Pins 2 and 3 should be connected to VSS. Fig.2 Pin configuration. November 1986 Philips Semiconductors Product specification 18-element bar graph LCD driver FUNCTIONAL DESCRIPTION The PCF1303T is an 18-element bar graph LCD driver with linear relation to the control voltage when in pointer or thermometer mode. The first segment will energize when the control voltage is less than the trigger voltage (VT(bar)2 see equation (3)). The circuit has analogue and digital sections. The analogue section consists of a parator with the inverting input coupled to the input control voltage. The non-inverting input of the parator is connected via 17 analogue switches to the nodes of an 18-element resistor divider. The extremities of the resistor divider are coupled via high-input impedance amplifiers to the maximum reference voltage input and the minimum reference voltage input. The control input functions with Schmitt trigger action. The digital section has one reference output (QR)...