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* The IC04 LOCMOS HE4000B Logic Family Specifications HEF, HEC * The IC04 LOCMOS HE4000B Logic Package Outlines/Information HEF, HEC
HEF4754V LSI 18-element bar graph LCD driver
Product specification File under Integrated Circuits, IC04 January 1995
Philips Semiconductors
Product specification
18-element bar graph LCD driver
DESCRIPTION
HEF4754V LSI
The HEF4754V drives an 18-element bar graph LCD in linear relation to the control voltage (Vc) in a pointer or thermometer mode.
Fig.1 Functional diagram.
FAMILY DATA See Family Specifications
January 1995
2
Philips Semiconductors
Product specification
18-element bar graph LCD driver
PINNING VOSC Vc Vref min Vref max I1 I2 I3 O1 to O18 OR oscillator terminal control voltage input reference voltage inputs thermometer/pointer (choice select input) peak value; reset/9 or 18 bars (choice select input) reset; repetitively reset (choice select input) bar outputs back plate output
HEF4754V LSI
HEF4754VP(N): 28-lead DIL; plastic (SOT117-2) HEF4754VD(F): 28-lead DIL; ceramic (cerdip) (SOT135) HEF4754VT(D): 28-lead SO; plastic (SOT136-1) ( ): Package Designator North America
FUNCTION TABLE I1 L L H H H Note 1. H = HIGH state (the more positive voltage) 2. L = LOW state (the less positive voltage) 3. X = state is immaterial I2 L H L H H I3 X X X L H MODE pointer; 18 bars pointer; 9 bars thermometer; no peak value thermometer; peak value, repetitively reset thermometer; peak value, manually reset Fig.2 Pinning diagram.
January 1995
3
Philips Semiconductors
Product specification
18-element bar graph LCD driver
GENERAL DESCRIPTION The HEF4754V drives an 18-element bar graph LCD in linear relation to the control voltage (Vc) in a pointer or thermometer mode. The first bar lights up when Vc is smaller than VT(bar)2 (see equation [3] below). In the pointer mode, the circuit can drive 9 or 18 bars; in the thermometer mode, the circuit also drives the peak value indication. This can be reset or repetitively reset, after 1,5 to 2 seconds. The circuit has analogue and digital parts. The analogue part consists of 17 comparators, with their non-inverting inputs connected together and coupled to the control input Vc. The inverting inputs of the comparators are connected in succession to the nodes of an 18-part resistor divider. LINEARITY VDD = 10 V; Vref max = 9,5 V; Vref min = 0,5 V; Tamb = 25 C V1 = 250 mV (this is the tolerance of the step voltage). V step = V step"" + V 1
HEF4754V LSI
The distance between the switching levels of the comparators is defined by the voltage difference across this divider. The extremities of the resistor divider are coupled via high-input amplifiers to the maximum reference voltage input and the minimum reference voltage input. The digital part has one reference output (OR) to drive the back plate, and 18 outputs (O1 to O18) to drive each bar. Three latches and some gates are incorporated for each bar output. An on-chip oscillator (1024 Hz) with external R and C drives the circuit. The outputs are driven at 64 Hz. The select inputs I1 to I3 are provided with an on-chip pull-up element, and they may therefore be left floating (equals HIGH state).
[1]
Vstep' is the (internal) voltage drop across the resistor-ladder network. ( V ref max V 2 ) - ( V ref min V 2 ) V step = --------------------------------------------------------------------------------------18 [2]
V2 is the maximum offset voltage spread of the on-chip voltage follower. V2 = 250 mV. The linearity is guaranteed for VDD > 10 V. The monotony between VDD = 5 V and 10 V is guaranteed. During ramping-up of the input voltage a maximum of two bars might be activated simultaneously. ABSOLUTE VOLTAGE TRIGGER LEVEL The absolute voltage trigger level at the Vc pin is VT(bar)n; V T ( bar ) n = { V ref min V 2 * } + { ( n - 1 ) V step V 1 } , in which n = number of bars; 2 n 18. For n = 1 (first bar) see text above. Note * For V2 the same sign (+ or -) should be used as in equation [2]. [3]
January 1995
4
Philips Semiconductors
Product specification
18-element bar graph LCD driver
RATINGS Limiting values in accordance with the Absolute Maximum System (IEC 134) Supply voltage Voltage on any input D.C. current into any input or output Storage temperature Operating ambient temperature DC CHARACTERISTICS VSS = 0 V Tamb (C) VDD V Quiescent device current Input leakage current (except) select inputs) Input voltage HIGH select inputs Input voltage LOW select inputs Output voltage HIGH Output voltage LOW Output current HIGH Output current LOW Input voltage control input Vc 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 VIC IOL -IOH VOL VOH VIL VIH IIN IDD SYMBOL - - - - - - 3,5 7,0 11,0 - - - 4,99 9,99 - - - - 0,36 0,80 3,0 0,34 1,00 4,40 - - - -40 MIN. MAX. - - - - - - - - - 1,5 3,0 4,0 - - - 0,01 0,01 0,01 - - - - - - - - - MIN. - - - - - - 3,5 7,0 11,0 - - - 4,99 9,99 14,99 - - - 0,3 0,7 2,8 0,3 0,9 4,0 0 0 0 - - - - - - - - - - - - - - - - - - - - - - - - - - - + 25 TYP. MAX. - 1000 1600 100 100 100 - - - 1,5 3,0 4,0 - - - 0,01 0,01 0,01 - - - - - - 5 10 15 MIN. - - - - - - 3,5 7,0 11,0 - - - 4,95 9,95 - - - - 0,24 0,56 2,60 0,24 0,72 3,20 - - - + 85 MAX. - - - - - - - - - 1,5 3,0 4,0 - - - 0,05 0,05 0,05 - - - - - - - - - VDD VI II Tstg Tamb max
HEF4754V LSI
-0,5 to + 18 V -0,5 to VDD + 0,5 V 10 mA -25 to + 125 C -20 to + 85 C
NOTES A A A nA nA nA V V V V V V V V V V V V mA mA mA mA mA mA V V V 6 5 4 3 3 2 1
January 1995
5
Philips Semiconductors
Product specification
18-element bar graph LCD driver
HEF4754V LSI
Tamb (C)
VDD V Max. input voltage Vref max input Min. input voltage Vref min input Operating supply current Notes 5 10 15 5 10 15 10
SYMBOL - VIRmax - - - VIRmin IDD - - -
-40 MIN. MAX. - - - - - - - MIN. 4,5 4,5 4,5 0,5 0,5 0,5 - - - - - - -
+ 25 TYP. MAX. 4,5 9,5 14,5 0,5 5,5 10,5 - MIN. - - - - - - -
+ 85 MAX. - - - - - - - V V V V V V A
NOTES
6
6 Fig.3
750
1. Vref min = 0,5 V; Vref max = 9,5 V; Vosc = Vc = 0 V; I1, I2 and I3 at VDD. 2. Pin under test at VSS or VDD, all other inputs simultaneously at VSS or VDD. 3. IO = 0; all inputs at VSS or VDD. 4. At VDD = 5 V: VOH = 4,5 V. At VDD = 10 V: VOH = 9,5 V. At VDD = 15 V: VOH = 13,5 V. 5. At VDD = 5 V: VOL = 0,4 V; inputs at VSS or VDD. At VDD = 10 V: VOL = 0,5 V; inputs at VSS or VDD. At VDD = 15 V: VOL = 1,5 V; inputs at VSS or VDD. 6. Vref min + 4 V < Vref max.
January 1995
6
Philips Semiconductors
Product specification
18-element bar graph LCD driver
HEF4754V LSI
January 1995
7
Fig.3 Typical operating set-up.

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