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ASL5015FHN 数据表(PDF) 21 Page - NXP Semiconductors |
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ASL5015FHN 数据表(HTML) 21 Page - NXP Semiconductors |
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21 / 69 page  NXP Semiconductors ASL5xxxyHz Matrix LED Controller (MLC) ASL5xxxyHz All information provided in this document is subject to legal disclaimers. © NXP B.V. 2019. All rights reserved. Product data sheet Rev. 2.1 — 5 February 2019 21 / 69 60 PCB temperature (°C) 140 160 120 80 100 70 (1) (2) (3) 150 130 90 110 aaa-026323 0.8 1.6 2.4 0.4 1.2 2.0 0.6 1.4 2.2 0.2 1.0 1.8 NTC (KΩ) 0 (1) NTC resistance High (2) NTC resistance Typical (3) NTC resistance Low Figure 10. Typical NTC resistance vs. temperature in the range 70 °C to 130 °C 8.6.2 Direct Identification resistor input Eight resistors with 1 % precision can be connected to the ID pin to read the identification / characterization information. The current on the ID pin is fixed to 25 µA ±10 %. The value of the resistor is determined at the MLC start-up and is available to the microcontroller in register 3Ah. The ID value is only read during device startup. To get the identification value, the microcontroller can read this register directly or ask for the IC diagnosis, the register 3Ah is included in the 8 bytes of diagnosis answer. The voltage drop in the ID pin is read and converted to a digital value via an internal ADC. The ID resistors' values are not overlapping in ranges in Table 9. Table 9. Possible identification resistors for nonoverlapping Resistor 4.75 8.06 11.3 14.3 17.4 21.5 26.7 32.4 [kΩ] Value 000 001 010 011 100 101 110 111 binary 8.6.3 LED fault detection Each PWM switch has an Open Circuit and a Short Circuit comparator, even when the system is in Limp Home mode. Open Circuit detection (OC): The OC detection threshold can be set to 6 V ±1 V (default value) or 17 V ±1.5 V, see Section 10 "ASL50xxyHz Register map". In case of an OC detection event, the PWM switch is closed and an error bit set. This process allows the IC to bypass this LED and the other LEDs to continue to operate. The bit flag can be reset by removing the supply voltage (VCC) or by a bus command writing a 1 in the register 34h, bit 1. In case of clearing the flags (writing in register 34h), the action is done dynamically and a power-on-reset is not necessary. If the open circuit was just a lapse, then the system recovers automatically when clearing the flags. The open circuit is immediately detected when the switch passes from low ohmic to high ohmic state. Short Circuit detection (SC): The SC detection limit is set to 1 V ± 0.5 V. The system can use a blanking time of 16 µs (default) or 32 µs, depending on the driving current and the string capacitor. The blanking time can be selected in the internal MTP bit 4, register |
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