As electronic products become smart, large enterprises, parking lots, elevators, and apartment occupants have increasing demand for access management; traditional door locks are no longer able to provide sufficient guarantee for safety, and smart access control systems were developed in response to this.
The architecture of access control systems includes:
1. Front end reader: Button push, RFID card reading, fingerprint identification, and facial recognition
- Reads the information of ID authentication, and sends it to the access controller for verification
- Stores/verifies/uploads legal access ID information
- Stores/uploads access records
- Responsible for the communication with the backstage host
- Controls the door lock switch
- EN_doorlock control.png (355.74 KiB) Viewed 6515 times
Front end readers can be divided into the following based on different ID authentication methods:
1. Button push (uses 8bit, Cortex-M0 class microcontroller)
- 8bit: low power consumption ML51 series and N76E003 series
- Cortex-M0: NUC029, M031, low power consumption M251 series
- 8bit: low power consumption ML51 series and N76E003 series
- Cortex-M0: NUC029, M031, low power consumption M251 series
- Cortex-M4: M4521 and M480 series
- Optical: ARM9 NUC970 series
- Capacitive: Cortex-M4 M480 series
- ARM9: NUC970 series
Back end access controllers can be divided into the following based on the different communication interfaces used to connect to the backstage:
1. TCP/IP (Ethernet) networked (uses ARM9, Cortex-M4 class microcontroller)
- ARM9: NUC970 series
- Cortex-M4: M480 series
- Cortex-M4: M480, M4521 and M451 series
Traditional access control systems mostly used RS485 to communicate with backstage. In recent years, almost all newly developed access control systems use Ethernet to communicate with the backstage. Generally speaking, split architecture (reader and access controller are separated; one access controller to multiple readers) is used for most of the access controls of entire buildings (manages multiple doors), whereas standalone architecture (reader and access controller are integrated into one machine) is used for most small business offices or home apartments.
Why is Nuvoton microcontroller your best choice?
1. Why is NUC970 series (ARM9 core) suitable for applying on access controllers?
Sufficient built-in DDR memory to support system design needs (DDR size 16/32/64/128MB)
Supports NAND/SPI interface; no limit on the plug-in Flash size
Supports the Linux operating system
Hardware cryptosystem engine accelerates the encryption/decryption process and reduces CPU load
Two Ethernet ports support TCP/IP networking
Up to 11 UART interfaces (and another 2 ISO7816 UART ports)
Supports 2 USB HS Host ports to connect external USB storage devices
Supports 2 SD card storage device ports
Up to 8-ch ADC, able to detect the power status of the backup batteries and support other sensor needs
Supports RGB interface and i80 interface, able to connect monitors
2. Why is M480 series (Cortex-M4 core) suitable for applying on access controllers?
Up to 192MHz core speed and 512KB Flash/160KB SRAM; the sufficient memory space supports the requirements for system designing
Supports the FreeRTOS/mbed operating system
Ethernet 10/100 supports TCP/IP networking
Up to 11 UART interfaces (6x LPUART + 3x ISO7816 UART + 2x USCI UART)
Hardware cryptosystem engine accelerates the encryption/decryption process and reduces CPU load
Supports 2 USB OTG ports (high speed and full speed) to connect external USB storage devices
Supports 2 SD card storage device ports (up to 2x 32GB)
Supports 5 SPI interfaces, able to plug-in SPI Flash storage
Supports EBI interface, able to plug-in SRAM storage (up to 3x 1MB) or support i80 LCD monitors
Up to 16-ch ADC, able to detect the power status of the backup batteries and support other sensor needs
SPIM interface plus cache memory function supports the running of program codes on plug-in Flash