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TC7116 Datasheet(PDF) 11 Page - Microchip Technology |
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TC7116 Datasheet(HTML) 11 Page - Microchip Technology |
11 / 26 page 2002-2012 Microchip Technology Inc. DS21457D-page 11 TC7116/A/TC7117/A 3.2.1 SYSTEM TIMING The clocking method used for the TC7116/TC7116A and TC7117/TC7117A is shown in Figure . Three clocking methods may be used: 1. An external oscillator connected to Pin 40. 2. A crystal between Pins 39 and 40. 3. An RC network using all three pins. The oscillator frequency is 4 before it clocks the decade counters. It is then further divided to form the three convert cycle phases: Signal Integrate (1000 counts), Reference De-integrate (0 to 2000 counts), and Auto-Zero (1000 to 3000 counts). For signals less than full scale, auto-zero gets the unused portion of ref- erence de-integrate. This makes a complete measure cycle of 4000 (16,000 clock pulses), independent of input voltage. For 3 readings per second, an oscillator frequency of 48kHz would be used. To achieve maximum rejection of 60Hz pickup, the sig- nal integrate cycle should be a multiple of 60Hz. Oscil- lator frequencies of 240kHz, 120kHz, 80kHz, 60kHz, 48kHz, 40kHz, etc. should be selected. For 50Hz rejec- tion, oscillator frequencies of 200kHz, 100kHz, 66-2/3kHz, 50kHz, 40kHz, etc. would be suitable. Note that 40kHz (2.5 readings per second) will reject both 50Hz and 60Hz. 3.2.2 HOLD READING INPUT When HLDR is at a logic HIGH, the latch will not be updated. Analog-to-Digital conversions will continue, but will not be updated until HLDR is returned to LOW. To continuously update the display, connect to TEST (TC7116/TC7116A) or GROUND (TC7117/TC7117A), or disconnect. This input is CMOS compatible with 70k typical resistance to TEST (TC7116/TC7116A) or GROUND (TC7117/TC7117A). FIGURE 3-6: TC7117/TC7117A Digital Section TC7117 TC7117A 4 39 OSC2 V+ Digital GND TEST 35 Clock 40 38 OSC3 OSC1 ÷ HLDR Control Logic Typical Segment Output Digital Ground To Segment V+ 0.5mA 8mA 37 21 500 Ω V+ 1 Latch ~70k Ω To Switch Drivers From Comparator Output Internal Digital Ground Thousands Hundreds Tens Units 7-Segment Decode 7-Segment Decode 7-Segment Decode |
Similar Part No. - TC7116_13 |
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Similar Description - TC7116_13 |
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