tc7129 Microchip Technology Inc., tc7129 Datasheet
tc7129
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tc7129 Summary of contents
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... Overrange and underrange outputs, along with a range-change input, provide the ability to create auto-ranging instruments. For snapshot read- ings, the TC7129 includes a latch-and-hold input to freeze the present reading. This combination of features Temperature makes the TC7129 the ideal choice for full-featured Range multimeter and digital measurement applications ...
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... INT OUT 44-Pin PLCC REF REF BUFF 34 NC TC7129CLW REF REF 31 COMMON 30 CONTINUITY 29 INT OUT © 2006 Microchip Technology Inc. ...
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... A Plastic DIP ..................................................... 1.23W PLCC ............................................................. 1.23W Plastic QFP .................................................... 1.00W Operating Temperature Range ............... 0°C to +70°C Storage Temperature Range.............. -65°C to +150°C TC7129 ELECTRICAL SPECIFICATIONS Electrical Characteristics V– = 9V, V Pin numbers refer to 40-pin DIP. Symbol Parameter Input Zero Input Reading Zero Reading Drift ...
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... TC7129 TC7129 ELECTRICAL SPECIFICATIONS (CONTINUED) Electrical Characteristics V– = 9V, V Pin numbers refer to 40-pin DIP. Symbol Parameter Power V Common Voltage COM Common Sink Current Common Source Current DGND Digital Ground Voltage Sink Current Supply Voltage Range I Supply Current Excluding S Common Current ...
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... Can be used as pre-regulator for external reference Positive side of external reference capacitor. REF C – Negative side of external reference capacitor. REF BUFFER Output of buffer amplifier Negative input voltage terminal Positive input voltage terminal. REF HI Positive reference voltage. REF LO Negative reference voltage TC7129 Function DS21459D-page 5 ...
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... TC7129 TABLE 2-1: PIN FUNCTION TABLE (CONTINUED) Pin No. Pin No. Pin No. 40-Pin PDIP 44-Pin PQFP 44-Pin PLCC — 6,17, 28, 39 12, 23, 34, 1 DS21459D-page 6 Symbol DGND Internal ground reference for digital section. See Section 4.2.1 “±5V Power Supply”. ...
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... DETAILED DESCRIPTION (All pin designations refer to 40-pin PDIP.) The TC7129 is designed to be the heart of a high- resolution analog measurement instrument. The only additional components required are a few passive elements: a voltage reference, a LCD and a power source. Most component values are not critical; ...
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... INT Using the values derived above (assuming 60 Hz operation), the equation becomes: EQUATION 3-2: 16.7 msec x 13 INT 2V DS21459D-page 8 Low Battery Continuity Display Drive Outputs TC7129 INT 0.1 µ 0.1 REF REF µF 1 µF 20 kΩ ...
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... Figure 4-1: a ±5V Power Supply. 4.2.2 Low Voltage Battery Source A battery with voltage between 3.8V and 6V can be used to power the TC7129 when used with a voltage doubler circuit, as shown in Figure 4-2. The voltage doubler uses the TC7660 DC-to-DC voltage converter and two external capacitors ...
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... Power Supply Measurements are made with respect to power supply ground. COMMON (pin 28) is connected to REF LO (pin 35). A voltage doubler is needed, since the supply voltage is less than the 6V minimum needed by the TC7129. DGND (pin 36) must be isolated from power supply ground (see Figure 4-3). + 0.1 µ ...
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... DISP 36 DGND V– 4.6 Measuring Techniques Two important techniques are used in the TC7129: successive integration Successive integration is a refinement to the traditional dual-slope conversion technique. 4.7 Dual-Slope Conversion A dual-slope conversion has two basic phases: inte- grate and de-integrate. During the integrate phase, the input signal is integrated for a fixed period of time ...
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... TC7129 Integrate Time Figure 4-9: Accuracy Errors in Dual-Slope Conversion. Zero Integrate INT 1 and Latch Integrate TC7129 Note: Shaded area greatly expanded in time and amplitude. Figure 4-10: Integration Waveform. DS21459D-page 12 De-integrate Overshoot due to zero-crossing between clock pulses Integrator Residue Voltage Overshoot caused by comparator delay of 1 clock pulse ...
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... TC7129 4.9 Digital Auto-Zeroing To eliminate the effect of amplifier offset errors, the TC7129 uses a digital auto-zeroing technique. After the input voltage is measured as described above, the measurement is repeated with the inputs shorted internally. The reading with inputs shorted is a measurement of the internal errors and is subtracted from the previous reading to obtain a corrected measurement ...
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... TC7129 TC7129 OSC1 OSC2 OSC3 RANGE L/H CONT V+ V– DGND COMMON Figure 4-11: TC7129 Functional Block Diagram. C REF REF HI REF INT DE- DE+ DE– DE+ Common INT INT , INT – – Continuity 200 mV Comparator Continuity Figure 4-12: Integrator Block Diagram. ...
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... The common and digital ground (DGND) outputs are generated from internal Zener diodes. The voltage between V+ and DGND is the internal supply voltage for the digital section of the TC7129. Common can source approximately 12 A; DGND has essentially no source capability (see Figure 4-15). DS21459D-page 15 – ...
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... V+ The L/H output goes low during the last 100 cycles of each conversion. This pulse latches the conversion 3.2V data into the display driver section of the TC7129. This COM pin can also be used as an input. When driven high, the 28 display will not be updated; the previous reading is 5V displayed ...
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... Microchip Technology Inc. Continuity Low Battery Continuity Segment Line All Off a Segment Off Off All On Figure 4-18: Typical Display Output Waveforms. TC7129 1 2 Backplane Connections Continuity Low Battery ...
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... TC7129 5.0 PACKAGING INFORMATION 5.1 Package Marking Information Package marking data not available a this time. 5.2 Taping Forms tandard R eel C omponent Orientation Component Taping Orientation for 44-Pin PQFP Devices Carrier Tape, Number of Components Per Reel and Reel Size Package 44-Pin PQFP Note: Drawing does not represent total number of pins. ...
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... L .120 .130 .135 c .008 .012 .015 .030 .050 .070 .014 .018 .022 .620 .650 .680 TC7129 MILLIMETERS NOM MAX 40 2.54 4.06 4.45 4.83 3.56 3.81 4.06 0.38 15.11 15.24 15.88 13.46 13.84 14.22 51.94 52.26 52.45 3.05 3.30 3.43 0.20 0.29 0.38 0.76 1.27 1.78 0.36 0.46 0.56 15.75 16.51 17. ...
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... TC7129 44-Lead Plastic Leaded Chip Carrier (LW) – Square (PLCC #leads= CH2 Dimension Limits Number of Pins Pitch Pins per Side Overall Height Molded Package Thickness Standoff § Side 1 Chamfer Height Corner Chamfer 1 Corner Chamfer (others) Overall Width Overall Length ...
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... A1 .010 - - L .029 .035 .041 F .077 REF. 0° 3.5° 7° E .547 BSC D .547 BSC E1 .394 BSC D1 .394 BSC c .004 - .009 B .012 - .018 5° - 16° 5° - 16° TC7129 A MILLIMETERS* MIN NOM MAX 44 0.80 BSC - - 2.45 1.95 2.00 2.10 0. 0.73 0.88 1.03 1.95 REF. 0° 3.5° 7° 13.90 BSC 13.90 BSC 10.00 BSC 10.00 BSC 0.11 - 0.23 0.30 - 0.45 5° - 16° ...
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... TC7129 NOTES: DS21459D-page 22 © 2006 Microchip Technology Inc. ...
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... To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office PART NO Device Temp. Pkg Taping Direction Device: TC7129: 4-1/2 Digit Analog-to-Digital Converter Temperature 0°C to +70° -25°C to +85°C Package 40-Pin PDIP KW = 40-Pin PQFP LW = 44-Pin PLCC ...
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... TC7129 NOTES: DS21459D-page 24 © 2006 Microchip Technology Inc. ...
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... Customers representative or field application engineer (FAE) for support. Local sales offices are also available to help customers. A listing of sales offices and locations is included in the back of this document. Technical support is available through the web site at: http://support.microchip.com TC7129 should contact their distributor, DS21459D-page 25 ...
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... Telephone: (_______) _________ - _________ Application (optional): Would you like a reply? Y Device: TC7129 Questions: 1. What are the best features of this document? 2. How does this document meet your hardware and software development needs you find the organization of this document easy to follow? If not, why? 4 ...
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... Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights. © 2006 Microchip Technology Inc. Trademarks The Microchip name and logo, the Microchip logo, Accuron, dsPIC, K ...
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... Taiwan - Kaohsiung Tel: 886-7-536-4818 Fax: 886-7-536-4803 Taiwan - Taipei Tel: 886-2-2500-6610 Fax: 886-2-2508-0102 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350 © 2006 Microchip Technology Inc. EUROPE Austria - Wels Tel: 43-7242-2244-399 Fax: 43-7242-2244-393 Denmark - Copenhagen Tel: 45-4450-2828 Fax: 45-4485-2829 France - Paris ...