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ASL5015FHV Datasheet(PDF) 20 Page - NXP Semiconductors |
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ASL5015FHV Datasheet(HTML) 20 Page - NXP Semiconductors |
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20 / 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 20 / 69 Registers IMMOFFREG1 and IMMOFFREG2 are used to turn all the channels OFF immediately. That means 100 % duty cycle in the internal FET gate (switch in low ohmic state and bypassing the LEDs) and 0 % PWM duty cycle in the LED or LEDs associated to this channel. These registers can be sent to a selected IC or as a broadcast message, depending on the frame ID only (command bits). The microcontroller can control every channel individually. Table 8. Start commands for each channel (Read/Write) Address Register D7 D6 D5 D4 D3 D2 D1 D0 32h START1 CH8 CH7 CH6 CH5 CH4 CH3 CH2 CH1 33h START2 unused CH12 CH11 CH10 CH9 Registers START1 and START2, are used to start the sequences. These commands should be sent after all the channels have been programmed with the desired values. The microcontroller can control every channel individually. Other way of starting a channel is programing the CURVEIDx resgister with NOW bit =1, but at least one previous START command must be performed from the moment the MLC startup. 8.5 Delay coefficient – ASL50xxyHz The delay coefficient can be set in the DELAYx register. See Section 8.4.1 "Channel programming registers map". This setting is individual for each channel and has a resolution of 8 bits. After the delay coefficient is set, a delay for a PWM curve can be programmed and the channel starts following the PWM dimming curve after the programmed step delay. This feature on the ASL50xxyHz saves many software lines in the MCU and reduces the load on the communication bus. The combination of the delay and the fade-in/fade-out curves can be used in applications such as dynamic turn indicator or welcome scenarios. The delay resolution is 4.09 ms in case the PWM frequency is set to 244 Hz or 2 ms if it is set to 488 Hz. 8.6 Diagnostics 8.6.1 Direct NTC input The MLC is able to read the voltage drop in an attached NTC from 0 V to 1.1 V. This analog voltage drop is converted to a digital value with an internal ADC. The customer can read the 6-bit digital value of this voltage drop in register 39h. The MLC uses a continuos current of 25 µA to check the NTC status. This check is to determine if an open or short condition is present. The MLC uses a current of 440 µA to measure the voltage drop in the NTC and provide the digital value (only when CAN command 13 or 46 are sent). Figure 10 shows the measurement process. The microcontroller triggers the NTC read with command 13 for selective MLC or command 46 for broadcast trigger. |
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