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ASL5015FHN 数据表(PDF) 30 Page - NXP Semiconductors |
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ASL5015FHN 数据表(HTML) 30 Page - NXP Semiconductors |
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30 / 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 30 / 69 – Output brightness = 0.5 * (1 – (20/128) = 0.42 = 42 % The examples above demonstrate that the reduced brightness value is not always the same for the different PWM duty cycle values. The default value for all the channels is 0 % reduction. See Section 14 "Nonvolatile Multitime Programmable Memory (MTP)" for detailed information about the MTP selectable values. 8.14 Limp Home mode operation When there is no communication with the microcontroller, but VCC is present, the MLC automatically enters Limp Home mode state (LHM). Each channel is either fully ON or fully OFF, as defined by a bit in the MTP. This bit is programmable by the user at the end of the production line. Default state of the switches is all OFF, which means all LEDs are ON. Table 22. LHM - Limp Home mode control register (address 3Ch) bit allocation Bit 7 6 5 4 3 2 1 0 Symbol BYPASS_BINNING LHM_EXIT LHM_TIMEOUT MTP_CFG Reset 0 0 0 0 0 0 0 0 Access R/W R/W R/W R/W R/W R/W R/W R/W Table 23. LHM - Limp Home mode control register (address 3Ch) bit description Bit Symbol Description 7 BYPASS_BINNING Bypass binning. 0 — Scaling/calibration factor is applied to the final PWM DC calculation 1 — Scaling/calibration factor is not applied to the final PWM DC calculation This bit can be used to: • Bypass the calibration factor during Camera calibration • Measure single LED brightness during manufacturing process Note: This bit is not related to the Limp Home Mode configuration of triggering. 6 to 4 LHM_EXIT Limp Home mode deactivation sequence and LHM timeout refresh.[1] 001 — Deactivation sequence, step 1 010 — Deactivation sequence, step 2 100 — Deactivation sequence, step 3 111 — LHM timeout refresh 3 to 1 LHM_TIMEOUT Timeout setting for activation of Limp Home mode.[2] 000 — 4.5 ms, setting 1 001 — 9 ms, setting 2 010 — 18 ms, setting 3 011 — 36 ms, setting 4 100 — 72.1 ms, setting 5 101 — 144.2 ms, setting 6 110 — 288.4 ms, setting 7 111 — 576.7 ms, setting 8 |
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