WEIKAI WK2212-IQNG

The WK2212 is the first dual-channel UART device featuring 256-level FIFO, low power consumption, and support for UART/SPI/IIC/8-bit parallel bus interfaces. The chip can be configured via mode selection to operate in any of the above host interface modes, extending the selected host interface into 2 enhanced UART channels.

The extended sub-channel UARTs offer the following features:

• Baud rate, word length, and parity format of each sub-channel UART are independently configurable, supporting communication rates up to 2Mbps.
• Each sub-channel can be independently configured to operate in advanced modes including IrDA infrared communication, RS-485 auto transceiver control, 9-bit network address auto-detection, and software/hardware automatic flow control.
• Each sub-channel features independent 256-level TX/RX FIFOs with user-programmable interrupt trigger levels and timeout interrupt support.

The WK2212 adopts a QFN32 RoHS-compliant lead-free package, operates over a wide supply voltage range of 2.5～5.0V, and supports configurable auto sleep/wake-up functionality.

• Multiple host interface options: UART, SPI, IIC, or 8-bit parallel bus
• Large hardware TX/RX buffer with 256-level FIFO support
• Low-power design with configurable auto-sleep and auto-wake modes (µs-level wake-up)
• Wide operating voltage range: 2.5V～5.0V
• Simplified configuration registers and control words for easy and reliable operation
• Industrial-grade product available
• High-speed CMOS process; sub-UART max baud rate up to 2Mbps@5V, 1.5Mbps@3.3V, 1Mbps@2.5V
• RoHS-compliant QFN32 lead-free package
• Independent sub-channel UART configuration, high-speed and flexible:
  • Each sub-UART is full-duplex and can be enabled/disabled via software
  • Independently configurable baud rates, up to 2Mbps per sub-UART
  • Each sub-UART character format — data length, stop bits, and parity mode — independently configurable
• Comprehensive sub-UART status query with per-channel software reset support
• FIFO features:
  • Independent 256-level TX FIFO per sub-UART with programmable trigger level
  • Independent 256-level RX FIFO per sub-UART with programmable trigger level
  • Software FIFO enable and flush
  • FIFO status and counter output
• Flow control:
  • Hardware auto flow control via RTS/CTS
  • Software auto flow control via XON/XOFF with programmable characters for auto send/recognition
• RS-485 features:
  • RTS-controlled automatic RS-485 TX/RX direction control
  • RS-485 network address auto-recognition
  • RS-485 data length programmable as 8-bit or 9-bit
• Parity error, framing error, overflow error, and Line-Break error detection
• Start bit error detection
• Built-in SIR-compliant IrDA infrared TX/RX codec, transfer rate up to 115.2Kbit/s
• Interrupt features: sub-UART RX FIFO timeout interrupt and Line-Break error interrupt support
• Standard 3-wire UART host interface (RX, TX, GND); no additional address or control signal lines required
• Baud rate auto-adaptation technology, up to 2Mbit/s
• Selectable odd parity, even parity, and no-parity modes
• Address-line-free UART expansion via on-chip protocol processor for multi-UART expansion
• UART host interface configurable to infrared mode via pin setting
• Max 16-byte continuous TX/RX
• Max speed 10Mbit/s
• SPI slave mode only
• SPI Mode 0
• Max 256-byte continuous TX/RX
• IIC bus interface support
• Max speed 1Mbit/s
• IIC slave mode only
• Max 256-byte continuous TX/RX
• Standard 8-bit MCU bus interface
• Commands and data share an 8-bit address bus, switched via AD (data/control) signal
• Sub-channel selection controlled and indicated via command word; no additional channel indicator signal lines required
• Occupies only 2 address spaces

• Multi-port serial server / multi-port serial card
• Industrial/automation RS-485 field control
• Wireless data transmission via 2G/3G/4G
• In-vehicle telematics platform / vehicle GPS positioning system
• Automatic Meter Reading (AMR) system
• POS / tax-control POS / financial terminals
• DSP / embedded systems