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ASL5015FHN bảng dữ liệu(HTML) 22 Page - NXP Semiconductors |
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22 / 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 22 / 69 60h. The blancking time is applicable from the moment the internal switch passes from a low ohmic to a high ohmic state. When there is a detection of an SC, the error bit is set and the microcontroller is aware of the fail. The microcontroller can then decide whether to close the switch associated to the shorted LED or not. If the microcontroller decides to close the switch, the rest of the LED string can continue working and just the affected LED is bypassed. Restore the fail bit flag by a bus command writing a 1 in the register 34h, bit 0 or removing the supply voltage. If the flag is restored with a CAN message (write a 1 in the CLEAR_SC bit of register 34h), then the MLC does not need a power-on-reset. In addition, an automatic recheck action is executed by the IC to confirm whether the fail is still present or not. If the fail is still present, then the MLC will flag it again. 8.6.4 Internal junction temperature warnings The maximum allowed junction temperature on the ASL5xxxyHz family is 175 °C. The user can program two warning thresholds to be activated. The default values are 140 °C for OTW_1 and 160 °C for OTW_2. As soon as the microcontroller receives these temperature warnings, it decides what action to take. For example, the microcontroller might reduce the LED string current to reduce the junction temperature and the whole system temperature. If the MLC reaches its maximum allowable internal temperature, 175 °C, it will not take any action. The microcontroller must correct any overtemperature situations to prevent a safety violation. OTW_1 and OTW_2 can be programmed in the MTP. The microcontroller triggers the junction temperature read and consequent flagging with command 13 for selective MLC or command 46 for broadcast trigger. Table 10. Junction temperature warning bits (Read) Address Register D7 D6 D5 D4 D3 D2 D1 D0 3Ah ID OTW_1 OTW_2 POK LHM_STATUS ID[3:1] ID-FAIL Note: If the MLC junction temperature reaches the OTW_2, reduce the LED string current. The OTW measurement has a ±10 % accuracy. 8.6.5 Undervoltage detection and protection The MLC incorporates an undervoltage protection on the VCC. The device switches off below 4.3 V. When an undervoltage condition is detected, all the switches get open (high ohmic state) and the communication with the device is not possible. If Vcc gets recovered, then the IC allows the communication again and a power on reset is not required. A full system diagnosis should be run after an undervoltage condition. 8.6.6 Diagnosis registers map 8.6.6.1 Register 34h - Status register Register 34h has read and write rights. This register can be sent/received to any MLC IC individually or can be a broadcast message. It depends on the CAN frame Extended-ID command. |
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