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User’s Manual for Advantech SOM-A2558 series module V1.00

ØnSW_RESET : software rest input pin. The pin is pulled high in SOM-A255F. The pin is triggered by signal falling edge.

ØnSA_PWR_ON : Suspend/wake-up pin. The pin is pulled high in SOM-A255F. The pin is triggered by signal falling edge.

2.2.13 Buzzer Control Interface

SOM-A255x series all support this function. Buzzer-out control signal is designed to control the buzzer on/off status.

If users want to design buzzer on CSB to be reminding or alarm system, user could reference “Advantech SOM-A255x series CSB design guide “.

If users want to control the buzzer, users can check the memory map to do it.

2.2.14 System Management Bus (SM Bus) interface

SOM-A255x series SM Bus is implemented by PXA255 I2C bus. If users’CSB is powered by battery pack with SM bus battery gauge IC, then users could connect the SOM-A255x SM Bus to battery pack to monitor battery status. SOM-A255x series SM bus directly support TI BQ2040 gas gauge IC.

2.2.15 Power-input

SOM-A255x needs 3.3V & 5V DC power inputs. The power sources (3.3V,

5V) must always be supplied even in system sleep mode. SOM-A255x power management is completely implemented on itself; users’CSB doesn’t need to control the power supply to SOM-A255x.

2.2.16 Back-up power input

If user want to keep the real time clock(RTC) works well in power off mode, user should connect the coin battery positive pin to BAT-VCC in X2

directly .The back-up power pin (BAT_VCC) is the only power source to supply RTC power when SOM-A255x system power (3.3V, 5V) is off.

The coin battery must be 3.0V Li-ion coin type.

The coin battery charging circuit is designed on SOM-A255x, so user shouldn’t and needn’t design the charging circuit on CSB.

If users don’t need RTC function in CSB, just let the BAT_VCC pin open.

2.2.17 PCI I/F (Thru X3)

SOM-A2558 & SOM-A255F could support 4 channels PCI device controllers on CSB. The PCI clock is 33 MHz. PCI I/F comes from Advantech EVA-C210 I/O enhancement chip. The PCI I/F feature is as followings:

-Compatible with PCI specification version 2.2

-32-bit data bus interface

-Built-in PCI bus arbiter

-Supports up to 3 individual external bus master devices

-Support PCI Bus Controller (FPCI) to PCI slave I/O read/write, memory read/write, configuration read/write cycle

-PCI Bus master support all disconnect types (Master-Abort, Target-Abort, Target-Retry, Disconnect with data, Disconnect without

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Advantech SOM-A2558 Buzzer Control Interface, System Management Bus SM Bus interface, Power-input, Back-up power input
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SOM-A2558 specifications

The Advantech SOM-A2558 represents a significant advancement in system-on-module (SOM) technology, designed to meet the needs of demanding applications in industries such as industrial automation, transportation, and smart cities. Featuring the Intel Apollo Lake processor, specifically the dual-core or quad-core options, the SOM-A2558 delivers an optimal blend of performance and efficiency.

At the core of the SOM-A2558 is the Intel Atom E3950 or E3940 processors, which enable robust processing capabilities while maintaining low power consumption. This is crucial for embedded systems that require continuous operation in energy-sensitive environments. The module supports up to 8GB of DDR4 memory, enhancing its multitasking abilities and enabling it to handle complex applications with ease.

One of the standout features of the SOM-A2558 is its extensive array of I/O options, including USB 3.0, UART, I2C, SPI, and GPIO. This versatility allows for seamless integration with various peripherals and sensors, making it ideal for IoT applications and industrial automation systems. The SOM also supports dual Gigabit Ethernet ports, providing high-speed network connectivity essential for real-time data transfer and communications.

In terms of graphics, the SOM-A2558 supports Intel HD Graphics, which enhances the visual performance for display applications. With integrated hardware-accelerated video decoding and support for 4K resolution, it is suitable for applications such as digital signage and multimedia processing.

Advantech has designed the SOM-A2558 for durability and reliability, featuring a wide operating temperature range from -40°C to 85°C, making it suitable for harsh environments. Additionally, the module's compact form factor ensures easy integration into various system designs, allowing developers to create tailored solutions without significant space constraints.

The SOM-A2558 also supports multiple storage options, including eMMC, SATA III, and M.2 interfaces, which provide flexibility for different storage needs and configurations. Its support for TPM 2.0 enhances security, a vital aspect for applications handling sensitive data.

In summary, the Advantech SOM-A2558 combines cutting-edge technology, extensive connectivity options, and robust performance to facilitate the development of innovative solutions across various sectors. Its features make it an excellent choice for developers looking to create reliable and efficient embedded systems.
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