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TC7107AIPL Arkusz danych(PDF) 11 Page - Microchip Technology |
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TC7107AIPL Arkusz danych(HTML) 11 Page - Microchip Technology |
11 / 26 page © 2002 Microchip Technology Inc. DS21455B-page 11 TC7106/A/TC7107/A 6.0 DIGITAL SECTION (TC7107A) Figure 6-2 shows a TC7107A block diagram. It is designed to drive common anode LEDs. It is identical to the TC7106A, except that the regulated supply and backplane drive have been eliminated and the segment drive is typically 8mA. The 1000's output (Pin 19) sinks current from two LED segments, and has a 16mA drive capability. In both devices, the polarity indication is “ON” for neg- ative analog inputs. If VIN- and VIN+ are reversed, this indication can be reversed also, if desired. The display font is the same as the TC7106A. 6.1 System Timing The oscillator frequency is divided by 4 prior to clocking the internal decade counters. The four-phase mea- surement cycle takes a total of 4000 counts, or 16,000 clock pulses. The 4000-count cycle is independent of input signal magnitude. Each phase of the measurement cycle has the follow- ing length: 1. Auto-zero phase: 1000 to 3000 counts (4000 to 12000 clock pulses). For signals less than full scale, the auto-zero phase is assigned the unused reference integrate time period: 2. Signal integrate: 1000 counts (4000 clock pulses). This time period is fixed. The integration period is: EQUATION 6-1: 3. Reference Integrate: 0 to 2000 counts (0 to 8000 clock pulses). The TC7106A/7107A are drop-in replacements for the 7106/7107 parts. External component value changes are not required to benefit from the low drift internal reference. 6.2 Clock Circuit Three clocking methods may be used (see Figure 6-1): 1. An external oscillator connected to Pin 40. 2. A crystal between Pins 39 and 40. 3. An RC oscillator using all three pins. FIGURE 6-1: CLOCK CIRCUITS TSI = 4000 1 FOSC Where: FOSC is the externally set clock frequency. TC7106A TC7107A 4 Crystal RC Network 40 38 EXT OSC 39 ÷ To TEST Pin on TSC7106A To GND Pin on TSC7107A To Counter |
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