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L99DZ80EP Datasheet(PDF) 42 Page - STMicroelectronics |
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L99DZ80EP Datasheet(HTML) 42 Page - STMicroelectronics |
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42 / 68 page  Application information L99DZ80EP 42/68 DocID18260 Rev 6 3.21 Controller of electrochromic glass The voltage of an electrochromic element connected at pin ECV can be controlled to a target value, which is set by the bits EC<5:0>. Setting bit ECON enables this function. An on-chip differential amplifier and an external MOS source follower, with its gate connected to pin ECDR, and which drives the electrochrome mirror voltage at pin ECV, form the control loop. The drain of the external MOS transistor is supplied by OUT10. A diode from pin ECV (anode) to pin ECDR (cathode) has been placed on the chip to protect the external MOS source follower. A capacitor of at least 5 nF has to be added to pin ECDR for loop-stability. The target voltage is binary coded with a full-scale range of 1.5 V. If Bit EC_HV s set to '0', the maximum controller output voltage is clamped to 1.2 V without changing the resolution of bits EC<5:0>. When programming the ECVLS driver to on-state, the voltage at pin ECV is pulled to ground by a 1.6 low-side switch until the voltage at pin ECV is less than dV ECVhi higher than the target voltage (fast discharge). The status of the voltage control loop is reported via SPI. Bit ECV_VHI is set, if the voltage at pin ECV is higher, whereas Bit ECV_VNR in the same status register is set, if the voltage at pin ECV is lower than the target value. Both status bits are valid, if they are stable for at least the ECVHI/ECVNR – filter time and are not latched. Since OUT10 is the output of a high-side driver, it contains the same diagnose functions as the other high-side drivers (e.g. during an overcurrent detection, the control loop is switched off). In electrochrome mode, OUT10 cannot be controlled by PWM mode. For EMS reasons, the loop capacitor at pin ECDR as well as the capacitor between ECV and GND have to be placed to the respective pins as close as possible (see Figure 20 for details). Table 27. Cross-current protection time COPT<3> COPT<2> COPT<1> COPT<0> Min Typ Max unit 0 0 0 0 150 250 360 ns 0 0 0 1 390 500 670 ns 0 0 1 0 590 750 980 ns 0 0 1 1 800 1000 1280 ns 0 1 0 0 1000 1250 1600 ns 0 1 0 1 1210 1500 1910 ns 0 1 1 0 1420 1750 2220 ns 0 1 1 1 1630 2000 2540 ns 1 0 0 0 1830 2250 2850 ns 1 0 0 1 2050 2500 3120 ns 1 0 1 0 2250 2750 3450 ns 1 0 1 1 2460 3000 3760 ns 1 1 0 0 2660 3250 4100 ns 1 1 0 1 2880 3500 4370 ns 1 1 1 0 3080 3750 4680 ns 1 1 1 1 3200 4000 5000 ns |
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