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10MHz Serial Bus with 8Bit PWM+ 8 Bit Analog Dimming enables rich RGB colors

MILPITAS, Calif., Jan. 18, 2021 (GLOBE NEWSWIRE) -- Lumissil Microsystems, a division of ISSI, today introduced the IS31FL3748, a new class of LED driver designed for creating extremely bright and colorful LED-based signage board displays. The IS31FL3748 is targeted for applications such as indoor or outdoor LED digital sign boards, zonal backlighting of LCD TV displays and attention grabbing RGB color lights for gaming machines.

The IS31FL3748 is firstly a software configurable 24x4 LED matrix driver which designers can use to create LED array sizes of up to 96 individually addressable LED dots. Each LED can be driven by a 0~40mA current, set by an external resistor and scalable through software registers. In addition each LED dot can be replaced by a number of serially connected LEDs. The result is instead of one individually addressable LED driven at 40mA; it is now possible to drive up to 9 Red LEDs or 7 of the Blue, Green or White LEDs in place of a single LED dot. The combined light output of multiple LEDs can then be used in large signs visible in daytime or used in dynamic zonal backlighting of LCD TFT displays or integrated into bright animated RGB color lights.

LEDs used for outdoor signage must compete with the sun for visibility. Viewing digital signs in daylight requires that LEDs output more light than typically required indoors so as to compensate for bright sun conditions. Obtaining a bright LED light can be accomplished by increasing the LED current or by increasing the number of LEDs. The IS31FL3748 addresses both of these requirements by supporting a 40mA current per LED and providing the capability for stacking many LEDs. Furthermore, multiple IS31FL3748 devices can be interconnected with a serial bus to expand the total display area. IS31FL3748 has three serial bus options; HSB (high speed series bus, up to 10MHz), DSB (Manchester encoded, daisy chained serial bus, up to 2MHz) or SPI (12MHz) bus.

'LED arrays are becoming the building blocks for interactive LED signage displays,' said Ven Shan, Vice President of Marketing. 'With our latest IS31FL3748 LED matrix driver, sign developers and makers can create highly visible signs for advertising, information displays for transportation vehicles, transit terminals, sporting arenas and anywhere information needs to be displayed to the public. Other creative applications are for interactive LCD display backlighting and gaming machines found in casinos and pachinko parlors.'

The IS31FL3748 provides designers with increased system reliability and dynamic brightness control to enhance the visibility and long-term operation of large LED signboards. Power smoothing features such as LED group delay and system clock skewing minimize power supply stress and transient noise. Spread spectrum technology designed into the IS31FL3748 will further reduce EMI radiation. Additional analog and digital dimming capabilities such as 8-bit dot correction will help compensate for LED luminous mismatch and PWM control will adjust the display brightness.

Other reliability enhancement capabilities integrated into the IS31FL3748 are LED open or short detection and a thermal error flag. The device is designed to operate over a wide temperature range of -40°C to 125°C which is beyond the typical extended industrial temperature range.

Availability and pricing

The IS31FL3748 is available now in production quantities and comes in a 6x6mm 48-pin QFN package. It is priced at $1.25 each in 10K pcs quantities.

About Lumissil

Lumissil is the analog/mixed-signal product division of ISSI, a fabless semiconductor company that designs and markets high performance integrated circuits for the following key markets: (I) automotive, (ii) communications, (iii) industrial/medical, and (iv) digital consumer. Lumissil's primary products are LED drivers for low to mid-power RGB color mixing and high power lighting applications. Other products include audio, sensor, high speed wired communications, optical networking ICs and Application-specific microcontrollers. ISSI/Lumissil is headquartered in Silicon Valley with worldwide offices in Taiwan, Japan, Singapore, China, Europe, Hong Kong, India, and Korea. Visit our web site at http://www.lumissil.com/

About Integrated Silicon Solution, Inc. (ISSI)

ISSI is a fabless semiconductor company that designs, develops and markets high performance SRAM, DRAM, Flash memory (including NOR flash, NAND flash and managed NAND solutions (eMMC)), and Analog/Mixed-signal integrated circuits. ISSI provides high-quality semiconductor products and has been a committed long-term supplier to its customers. ISSI is headquartered in Silicon Valley with worldwide offices in Taiwan, Japan, Singapore, China, Europe, Hong Kong, India, and Korea. Visit our web site at http://www.issi.com/

A photo accompanying this announcement is available at https://www.globenewswire.com/NewsRoom/AttachmentNg/199278f3-bc1a-4b2e-a50d-a9b1edce2ce0

Many devices supported by OpenWrt contain an Ethernet network switch. Most switches are configurable and driver options are available. Typical features include ethernet frame tagging and VLAN support. We require two software components:

1. a utility

DSA Distributed Network Switch

The preferred contemporary driver architecture for ethernet switches in the Linux kernel is DSA (distributed switch architecture).

For a user the main difference to past OpenWrt switch drivers is that all the switch ports that on a consumer router have names such as LAN1, LAN2, … or WAN also appear as independent network interfaces in userspace and those can be handled like any other network interfaces using the ip tool or ethtool.

The Linux kernel also has userspace configuration examples on how to use the DSA switches in Linux.

DSA support will be introduced along with kernel 5.4 support, but there is no full feature parity with swconfig yet as of writing (2020-05-12). Changing VLAN tags is not supported yet at the moment, e.g..

Tagging support is more complex than with swconfig; see the kernel documentation for configuration instructions. It looks like at this point there is no automation for this yet and it needs to be configured through /etc/rc.local.

Support matrix

Only master targets actually having DSA enabled are listed.

Switchdev

Note: not to be confused with Linux switchdev, which DSA is based on.

The previous switch driver model invented by OpenWrt was switchdev and the corresponding configuration utility was swconfig. This is used in legacy patches and userspace, but is not recommended when implementing switch drivers for new devices. Please write new code using DSA and help out to convert old drivers to DSA if you can.

Ethernet Network Switch models

Realtek

• RTL8366/RTL8369 datasheet, notice that this is quite different from RTL8366RB or RTL8369S
• RealTek RTL8366RB, a 5-port Gigabit switch e.g. in the WR1043ND v1 or DIR-685
  • Upstream RTL8366RB DSA kernel driver this should become the default after incorporating kernel v4.19 or later
  • • e.g. Ticket 7977:Enhance rtl8366rb driver
    • e.g. Ticket 10202: Add support for port mirroring in rtl8366rb
  • see all changesets concerning the Realtek RTL8366RB
    • e.g. r36847: add port mirroring/monitoring capability to the RTL8366RB switch
• Realtek RTL8306SD/SDM FastEthernet, 6 Ports, 5x 100BASE-TX-PHYs e.g. in the ARV4518PW
• RTL8309G FastEthernet, 9 Ports, 8x 100BASE-TX-PHYs e.g. in the D-Link DIR-632

Qualcomm / Atheros

• AR8216 FastEthernet, 6 ports; found in Arcadyan ARV752DPW22, Netgear WNR2000v1, others
• AR8316 GigabitEthernet, e.g. in the RouterStation Pro, WBMR-HP-G300H, …
• AR8228 + AR8229 FastEthernet: 7-Ports, 5x 100BASE-TX-PHYs
• AR8327 + AR8327N GigabitEthernet: 7Ports, 5x 1000Base-T-PHYs e.g. in the WR1043ND v2 (Atheros AR8327N-BL1A)
• AR8328 + AR8328N GigabitEthernet: 7Ports, 5x 1000Base-T-PHYs
• Atheros AR934X built-in switch

Note: Atheros Switch-Chips with the 'N' designation include the Hardware NAT function.

Broadcom

Vitesse

• Vitesse have produced 4-port PHYs VSC8584 and VSC8574
• Vitesse have produced switch chips for 5+1 and 8+1 switches VSC7385, VSC7388, VSC7395 and VSC7398.
• The Vitesse switch chips family were acquired by Micosemi who were then acquired by Microchip.
• Micochip will provide complete datasheets if you sign an NDA on their website

MediaTek / Ralink

Other

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Features

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• some Switches contain a functionality called “Hardware NAT”; support for this features has not yet been included into OpenWrt. Since the cpus used in CPE Routers are relatively slow, expect 2 to 4 times performance gain if you were to use Hardware NAT, e.g. without hardware NAT some router could achieve 400Mbit/s at full CPU load, with hardware NAT it could achieve 900Mbit/s at full CPU load. OpenWrt developer is supposed to have said, that implementing HW-NAT support would be unacceptably hacky to accomplish.

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