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TC7116 Datasheet(PDF) 9 Page - TelCom Semiconductor, Inc |
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TC7116 Datasheet(HTML) 9 Page - TelCom Semiconductor, Inc |
9 / 14 page 3-211 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 negative supply for externally-generated segment drivers, such as decimal points or any other presentation the user may want to include on the LCD. (Figures 5 and 6 show such an application.) No more than a 1 mA load should be applied. The second function is a "lamp test." When TEST is pulled HIGH (to V+), all segments will be turned ON and the display should read –1888. The TEST pin will sink about 10 mA under these conditions. DIGITAL SECTION Figures 8 and 9 show the digital section for TC7116/ TC7116A and TC7117/TC7117A, respectively. For the TC7116/TC7116A (Figure 8), an internal digital ground is generated from a 6V zener diode and a large P-channel source follower. This supply is made stiff to absorb the relative large capacitive currents when the backplane (BP) voltage is switched. The BP frequency is the clock fre- quency 800. For 3 readings per second, this is a 60-Hz square wave with a nominal amplitude of 5V. The seg- ments are driven at the same frequency and amplitude, and are in-phase with BP when OFF, but out-of-phase when ON. In all cases, negligible DC voltage exists across the segments. Figure 9 is the digital section of the TC7117/TC7117A. It is identical to the TC7116/TC7116A, except that the regulated supply and BP drive have been eliminated, and the segment drive is typically 8 mA. The 1000's output (pin 19) sinks current from two LED segments, and has a 16-mA drive capability. The TC7117/TC7117A are designed to drive common anode LED displays. In both devices, the polarity indication is ON for analog inputs. If V – IN and V + IN are reversed, this indication can be reversed also, if desired. Figure 8. TC7116/TC7116A Digital Section TC7116 TC7116A LCD PHASE DRIVER THOUSANDS HUNDREDS TENS UNITS 4 BACKPLANE 21 39 37 OSC INTERNAL DIGITAL GROUND V + V – TEST 6.2V 500 Ω 26 35 TO SWITCH DRIVERS FROM COMPARATOR OUTPUT CLOCK VTH = 1V 7-SEGMENT DECODE 7-SEGMENT DECODE 7-SEGMENT DECODE 200 40 38 TYPICAL SEGMENT OUTPUT INTERNAL DIGITAL GROUND SEGMENT OUTPUT V + 0.5 mA 2 mA LATCH 2 OSC3 OSC1 ÷ ÷ HLDR 70 k Ω LOGIC CONTROL 1 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS WITH HOLD TC7116 TC7116A TC7117 TC7117A |
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Similar Description - TC7116 |
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