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L99DZ80EP データシート(PDF) 43 Page - STMicroelectronics |
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L99DZ80EP データシート(HTML) 43 Page - STMicroelectronics |
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43 / 68 page  DocID18260 Rev 6 43/68 L99DZ80EP Application information 67 If the electrochrome element is connected between the pins ECV and ECFD instead between ECV and ground, a negative voltage can be applied to the device by pulling ECFD to a higher value than ECV, which is connected to ground by a 1.6 low-side switch. In this mode the voltage at pin ECFD is controlled to the target value defined by the register EC<5:0>. This is done using an on-chip source-follower transistor (see Figure 21 for details). The negative discharge is enabled by setting bit ECND to ‘1’. When programming the ECFDLS driver to on-state, the voltage at pin ECFD is pulled to ground by a 1.6 low-side switch until the voltage at pin ECFD is less than dV ECFDhi higher than the target voltage (fast discharge). During normal (positive) voltage control the low side driver at pin ECFD must be switched on to connect the electrochrome element to ground. Pin ECDR is pulled resistively (RECDRDIS) to ground while not in electrochrome mode. Figure 20. Electrochrome mirror driver with mirror referenced to ground |
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