 |
数据搜索系统，热门电子元器件搜索 |
|
|
数据搜索系统，热门电子元器件搜索 |
|
ASL5015FHN 数据表(PDF) 29 Page - NXP Semiconductors |
|
|
|||||||||||||||||||||||||||||
ASL5015FHN 数据表(HTML) 29 Page - NXP Semiconductors |
|
|
29 / 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 29 / 69 Synchronization between MLCs is therefore done through CAN communication. There is no need for a separate sync signal, which can compromise EMI performance and board layout. The communications protocol is byte-oriented. Because up to 32 devices can be connected together, five bits are sufficient to address the MLC device. Extended ID is used for addressing the device and differentiate between oriented or broadcast message. The Standard ID includes the preamble to synchronize all devices in the bus and ensure a CAN clock accuracy of less than 0.25 %. 8.11 External IC addressing To make logistics easier, the MLC can be addressed externally with specific hardware configuration of pins from A0 to A4. Five pins are available to address the MLC externally. Therefore, the system can connect up to 32 MLCs. The same physical layer, in case of an off-board configuration, can control all of these MLCs. All these pins have an internal pull-up resistor of 60 kΩ. Thus, if a logic 1 is needed, the pin should remain floating. If a logic 0 is needed, the pin should be connected to ground. 8.12 Protection against missing VCC When VCC is missing, the MLC is off and all switches remain open. But when VCC is present and the device is working properly, it sets a bit in the diagnostics register that the microcontroller can read (POK). The microcontroller should only enable the LED driver when it is able to read this bit. 8.13 LED brightness calibration factor The LED brightness calibration factor can be programmed and read out from the MTP of the MLC by the microcontroller. This capability allows the customer to correct for any differences in the luminance of LEDs, as a result of LED production spread, automatically inside the MLC. The LED brightness calibration factor has a 5-bit resolution (from 0 to 31); and for that reason, the brightness reduction can be from 0 % to 24.22 %1. With this factor, the microcontroller does not need to adapt the PWM duty cycle for the brightness variation, because it is calculated inside the MLC. Therefore, when the microcontroller associates a prestored dimming curve that delivers 100 % duty cycle to a channel, and this channel has a brightness reduction associated to it, then the LED brightness cannot be 100 %, but reduced by the brightness calibration factor. The brightness reduction factor is applicable to any PWM duty cycle value and is not a fixed value but a percentage. Two examples are shown below: LED brightness calibration factor for both examples = 20 (10100 in the MTP) • Example 1 – The PWM duty cycle value in the curve is 100 % – Output brightness = 1 * (1 – (20/128)) = 0.84 = 84 % • Example 2 – The PWM duty cycle value in the curve is 50 % 1 The factor division inside of the MLC is by 128. |
|
链接网址 |
| ALLDATASHEET是否为您带来帮助? [ DONATE ] |
关于 Alldatasheet | 广告服务 | 联系我们 | 隐私政策 | 数据表链接 | 链接交换 | 制造商名单 All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Chinese ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
