The digital inputs are read by a HVS882 from Texas Instruments. It is a CMOS 10-bit switched-capacitor successive-approximation (SAR) analog-to-digital (A/D) converter. The Analog Ins are driving by a TV1544 from Texas Instruments. They are driven to have a 10V output range with a 12-bit resolution. The Analog Out are driven by a AD5724 also from Analog Devices, which is a a complete, quad, 12-/14-/16-Bit, serial input, unipolar/bipolar voltage output DAC. The Relays are HF33024-HLT, which are isolated from the CPU by two ADuM3401 from Analog Devices. During boot it is set if possible by testing various NTP servers. This allows the system to run without an internet connection, while still having a valid time. The Miniserver has a battery backed CMOS Real-Time Clock (RTC) via a PCF2123 from NXP Semiconductors. The SD Card is accessed with some logic gate directly. It doesn’t offer a lot, so most of the load for the different protocols TCP/IP and UDP, ARP, DHCP, etc. Which is a 10BASE-T/100BASE-TX Automotive Physical Layer Transceiver. The Ethernet is connected with another Chip from Microchip, the KSZ8051RNL1. The other important chips are two SD RAM chips ( H57V2562GTR from SK Hynix) as additional memory with 256MBit each adding another 64MB of memory. This flash memory also contains non-volatile memory used by the Miniserver, like encryption keys, which are not stored on the SD card. It is paired with a serial interface Flash memory ( AT25DF041A from Adesto Technologies), which is updatable by Loxone – it is one of two chips mounted on the back of the board. It is a 3,3V 400MHz ARM926 with 32kb internal SRAM and 64kb internal ROM. The CPU is an Atmel AT91SAM9G20 from Microchip. This code then loads the actual operating system from the SD Card into the additional 64MB of memory and executes it from there. The CPU is booting from a 512kb flash memory. The Miniserver (as well as all extensions) are ARM based, just like all modern mobile phones. I’d like to explain some technical details of the Loxone Miniserver.
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