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PCA2117DUGS/DA 数据表(PDF) 38 Page - NXP Semiconductors |
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PCA2117DUGS/DA 数据表(HTML) 38 Page - NXP Semiconductors |
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38 / 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 38 of 107 NXP Semiconductors PCA2117 Automotive LCD driver for character displays Equation 1 to Equation 3 exemplify the VLCD generation with temperature compensation. (1) (2) (3) 1. VLCDx is the decimal value of the programmed VLCD factor (VLCDA[8:0] or VLCDB[8:0]). 2. VT is the binary value of the calculated temperature compensating factor (VT[8:0]) of the temperature compensation block (see Table 36). The temperature compensation block provides the value which is a two’s complement with the value of 0h at 20 C. Figure 19 shows how the VLCD changes with the programmed value of VLCDx[8:0]. Fig 18. VLCD generation including temperature compensation V prog LCD VLCDx 0.03 V 4 V + = V offset LCD VT 0.03 V = V LCD V prog LCD V offset LCD +VLCDx 0.03 V 4 VVT 0.03 V ++ == |
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