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ASL5015FHN 数据表(PDF) 26 Page - NXP Semiconductors |
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ASL5015FHN 数据表(HTML) 26 Page - NXP Semiconductors |
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26 / 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 26 / 69 Bit Symbol Description 3 to 1 IDENTIFICATION Resistor value 000 — Resistor value 1 001 — Resistor value 2 010 — Resistor value 3 100 — Resistor value 4 011 — Resistor value 5 101 — Resistor value 6 110 — Resistor value 7 111 — Resistor value 8 In this register, the microcontroller can read the identification resistor value with a 3-bit resolution, from bit 1 to 3. Those three bits give the possibility of using eight different resistors to characterize the board or LEDs used with the MLC IC. 0 ID-FAIL Identification resistor fail 0 — No open or short condition is detected in the ID pin. 1 — An open or short condition is detected in the ID pin. Table 18. Internal Status - Internal status control register (address 3Bh) bit allocation Bit 7 6 5 4 3 2 1 0 Symbol TXD_BUFFER_OVERFLOW unused Reset 0 0 0 0 0 0 0 0 Access R R R R R R R R Table 19. Internal Status - Internal status control register (address 3Bh) bit description Bit Symbol Description 7 TXD_BUFFER_ OVERFLOW Used to flag a message buffer overflow 0 — The communication buffer has less than three messages in the queue 1 — The communication buffer has three or more messages in the queue Note: The MLC communication buffer has four free spaces. If the microcontroller continues requesting information and does not give time for the MLC to answer, then when the buffer is overflowed, the MLC will start overwriting the content of the last position. 6 to 0 unused 8.7 Internal oscillator 200 MHz for digital blocks The internal oscillator provides the clock signal for the internal digital blocks. This block is automatically trimmed to generate a 200 MHz clock signal with 10 % accuracy. The 200 MHz oscillator and an adaptive prescaler gives the 10 MHz needed for the serial CAN communication. The preamble of the CAN message (standard-ID) is used to calibrate the prescaler. Therefore, the CAN clock has an accuracy of less than 0.25 %. The internal oscillator helps to reduce the system cost and improves the system behavior when synchronizing the internal modules and different MLCs. This feature also helps the MLC system to have a superior EMC behavior. |
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