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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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P89LPC9331FDH датащи(PDF) 61 Page - NXP Semiconductors |
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P89LPC9331FDH датащи(HTML) 61 Page - NXP Semiconductors |
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61 / 93 page  P89LPC9331_9341_9351_9361_3 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 03 — 2 June 2009 61 of 93 NXP Semiconductors P89LPC9331/9341/9351/9361 8-bit microcontroller with accelerated two-clock 80C51 core 8.4 PGA (P89LPC9351/9361) Additional PGA module is integrated in each ADC module to improve the effective resolution of the ADC. A single channel can be selected for amplification. The gain of PGA can be programmable to 2, 4, 8 and 16. Please refer to Table 12 “Static characteristics” for detailed specifications. Register PGACONx and PGACONxB are used to for PGA configuration. Register PGAxTRIM2X4X and PGAxTRIM8X16X provide trim value of PGA gain level. As power-on, default trim value for each gain setting is loaded into the PGA trim registers. For accurate measurements, offset calibration is required. Please see the P89LPC9331/9341/9351/9361 User manual for detail configuration, calibration, and usage information. 8.5 Temperature sensor An on-chip wide-temperature range temperature sensor is integrated with ADC0 module. It provides temperature sensing capability of −40 °C ~ 85 °C. It is necessary to measure the 1.2 V reference voltage via the ADC before measuring temperature. In P89LPC9351/9361, the reference voltage, temperature sensor and AD03 input pin multiplex one input to PGA0. Please see the P89LPC9331/9341/9351/9361 User manual for detail usage of temperature sensor. Fig 24. P89LPC9351/9361 ADC block diagram + – comp PGA0 AD00 8 CONTROL LOGIC AD01 AD02 AD03 Vref(bg) Vsen + – comp to comparators SAR SAR 8 input MUX Anin00 Anin01 Anin02 Anin03 input MUX CCLK 002aad576 PGA1 AD10 4 AD11 AD12 AD13 DAC0 DAC1 Anin10 Anin11 Anin12 Anin13 |
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