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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PCF8545ATT датащи(PDF) 40 Page - NXP Semiconductors |
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PCF8545ATT датащи(HTML) 40 Page - NXP Semiconductors |
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40 / 103 page  PCA8530 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved. Product data sheet Rev. 2 — 25 September 2014 40 of 103 NXP Semiconductors PCA8530 Automotive 102 x 4 Chip-On-Glass LCD segment driver 8.10.4 Temperature measurement and temperature compensation of VLCD 8.10.4.1 Temperature readout The PCA8530 has a built-in temperature sensor which provides an 8-bit digital value (TD[7:0]) of the ambient temperature. This value can be read by command (see Section 8.2.6 on page 12 and Section 8.2.7 on page 13). The actual temperature is determined from TD[7:0] using Equation 3. (3) TD[7:0] = FFh means that no temperature readout is available or was performed. The measurement needs about 8 ms to complete. It is repeated periodically every second as long as bit TME is set logic 1 (see Table 17 on page 17). Due to the nature of a temperature sensor, oscillations may occur. To avoid this, a filter has been implemented in PCA8530. A control bit, TMF, is implemented to enable or disable the digital temperature filter (see Table 17 on page 17). The system is exemplified in Figure 21. The digital temperature filter introduces a certain delay in the measurement of the temperature. This behavior is illustrated in Figure 22. Fig 21. Temperature measurement block with digital temperature filter T C 0.6275 TD 7:0 40 – = |
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