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L99LD01 データシート(PDF) 16 Page - STMicroelectronics |
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L99LD01 データシート(HTML) 16 Page - STMicroelectronics |
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16 / 69 page  Functional description L99LD01 16/69 DocID025319 Rev 3 Figure 7. Slow vs ramp down 2.2 Protections and functions 2.2.1 LED current adjust and temperature control The LED current can be adjusted within a range of ± 66.7 %, with respect to the default value set by the LED current sense resistor, via the SPI input, so allowing the end of line calibration. The LED chain temperature measurement is achieved by means of an external NTC resistor connected between the NTC pin and GND. The NTC resistor is supplied through a resistor connected to the 5 V internal regulator output. As soon as the voltage on the NTC resistor becomes lower than the internal threshold, VNTC_TH, (due to an overtemperature in the LED chain) an internal circuitry is activated and the internal LED current reference voltage decreases proportionally, so that the LED current is progressively |
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