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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PCA2117DUGS/DA датащи(PDF) 42 Page - NXP Semiconductors |
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PCA2117DUGS/DA датащи(HTML) 42 Page - NXP Semiconductors |
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42 / 107 page  PCA2117 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved. Product data sheet Rev. 4 — 8 April 2015 42 of 107 NXP Semiconductors PCA2117 Automotive LCD driver for character displays The digital temperature filter introduces a certain delay in the measurement of the temperature. This behavior is illustrated in Figure 24. 8.4.5.2 Temperature adjustment of the VLCD Due to the temperature dependency of the liquid crystal viscosity, the LCD supply voltage may have to be adjusted at different temperatures to maintain optimal contrast. The temperature characteristics of the liquid are provided by the LCD manufacturer. The slope has to be set to compensate for the liquid behavior. Internal temperature compensation can be enabled via bit TCE (see Table 32 on page 26). The ambient temperature range is split up into 4 regions (see Figure 25) and to each a different temperature coefficient can be applied. Fig 23. Temperature measurement block with digital temperature filter (1) Environment temperature, T1 ( C). (2) Measured temperature, T2 ( C). (3) Measurement temperature variation, T meas =T2 T1. Fig 24. Temperature measurement delay |
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