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ASL5015FHN 数据表(PDF) 31 Page - NXP Semiconductors |
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ASL5015FHN 数据表(HTML) 31 Page - NXP Semiconductors |
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31 / 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 31 / 69 Bit Symbol Description 0 MTP_CFG MTP configuration. 0 — MLC normal operation 1 — MLC in MTP configuration mode Note: To read or write the MTP, the microcontroller must enter MTP configuration mode. [1] When refreshing the timeout timer with 111 in bits [6:4], the Limp Home mode timeout setting is written as well in bits [3:1] [2] When changing the Limp Home mode timeout setting, the LHM_EXIT bits should be set to “111” to refresh the timeout timer After MTP configuration, the limp home settings are permanently stored. Once the MLC detects a communication failure event (Limp Home mode watch dog timer runs out), the device turns the switches ON or OFF, depending on the Limp Home mode configuration stored in the MTP. In case the system recovers from the error, Limp Home mode can be left via the exit Limp Home mode sequence. With the completion of the exit sequence, the device operates in normal conditions and the configuration registers are open for write access again. The MLC keeps the LHM configuration in the output until the microcontroller starts another sequence. Limp Home and normal operation modes offer the same diagnosis behavior. This behavior includes the undervoltage protection as well as the failure behavior (open and short-circuit detection). 8.14.1 Limp Home mode activation If no write to the Limp Home mode exit bits (register 3Ch, bits 6:4) with data 111 is executed for the timeout time as defined in the Limp Home mode control register, a Limp Home mode is automatically activated. During start-up, the MLC is preconfigured to the maximum allowed watchdog timeout possible (576.7 ms). If this value wants to be changed, the user must set a new watchdog timeout during the configuration of the register. If the microcontroller does not send an LHM_Refresh command before 576.7 ms after the startup, then the MLC automatically enters in Limp Home mode. Before entering MTP configuration mode, refresh the watchdog timeout. During the MTP configuration, the watchdog is stopped and the refreshing action is not necessary during this time. 8.14.2 Limp Home mode operation Once the system has entered Limp Home mode, the MLC switches to the configuration as defined in the MTP memory. See Section 14 "Nonvolatile Multitime Programmable Memory (MTP)" for more information about the Limp Home mode configuration. During Limp Home mode, operation of the CAN interface remains functional, but only the Limp Home mode control register can be written. The other registers offer only read access. 8.14.3 Limp Home mode deactivation To deactivate Limp Home mode, a dedicated Limp Home mode deactivation sequence is written to the Limp Home mode control register. |
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