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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPXM2102AS датащи(PDF) 366 Page - Motorola, Inc |
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MPXM2102AS датащи(HTML) 366 Page - Motorola, Inc |
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366 / 670 page  AN1305 3–220 Motorola Sensor Device Data www.motorola.com/semiconductors PURPOSE This evaluation system, shown in Figure 1, demonstrates the ease of operation and interfacing of the Motorola MPX5100 series pressure sensors with on–chip temperature compensation, calibration and amplification. The board may be used to evaluate the sensor’s suitability for a specific application. DESCRIPTION The DEVB–114 evaluation board is constructed on a small printed circuit board. It is powered from a single +5 Vdc regulated power supply. The system will display the pressure applied to the MPX5100 sensor in pounds per square inch. The range is 0 PSI through 15 PSI, resolved to 0.1 PSI. No potentiometers are used in the system to adjust the span and offset. The sensor’s zero offset voltage with no pressure applied to the sensor is empirically computed each time power is applied to the system and stored in RAM. The sensitivity of the MPX5100 is repeatable from unit to unit. There is a facility for a small “rubbering” of the slope constant built into the program. It is accomplished with jumpers J1 and J2, and is explained in the Operation section. The board contents are further described in the schematic, silk screen plot, and parts list that appear in Figures 2, 3 and Table 1. BASIC CIRCUIT The evaluation board consists of three basic subsystems: an MPX5100GP pressure sensor, a four digit liquid crystal display (only three digits and a decimal are used) and a programmed microprocessor with the necessary external circuitry to support the operation of the microprocessor. 30 29 28 27 26 25 24 31 38 37 36 35 34 33 32 48 45 44 42 43 46 47 49 44 VSS ∼.302 V ∼4.85 V 15 OHM 453 OHM 22 pF 100 µF 52 50 TD0 RDI 5 PORTA PORTB 3 4 5 6 7 1 2 0 3 4 5 6 7 1 2 76 5 4 3 21 0 PORTC GND VPP6 15 1% 1% 1% 30.1 OHM XDCR1 RESET IN U1 U2 34064P– 5 .1 + 10K 10K 4.7K 22 pF 10MEG 4 MHz Y1 C4 C3 C2 C1 R7 R6 R5 R4 R3 R2 R1 J3 MC68HC705B5FN +5 OUT VCC MPX5100 TCAP2 TCAP1 D/A PD5 PD0 PD1 PD2 PD3 PD4 VDD +5 PD7 PD6 17 16 OSC2 OSC1 +5 8 7 VRH VRL +5 GND +5 18 RESET IRQ 19 43 J2 J1 +5 1–4, 33 39, 38, 40 28 BP IEE PART NUMBER LCD5657 OR EQUAL LIQUID CRYSTAL DISPLAY 26 37 36 35 34 32 31 30 29 27 25 24 23 22 21 20 19 14 12 11 17 18 16 15 13 10 9 8 7 6 5 14 13 12 11 10 921 22 23 LCD Figure 2. DEVB–114 System Schematic ___ ______ Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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