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Chip Overview

CI231 series chip is a new generation of high-performance neural network intelligent speech eveloped by Chipintelli. It integrates the brain neural network processor BNPU V3 and CPU core developed by Chipintelli. The system frequency can reach 240MHz, the built-in SRAM is up to 640KByte, and the integrated PMU power management unit. Integrated dual-channel high-performance low-power Audio Codec and multi-channel UART, IIC, PWM, GPIO, PDM and other peripheral control interfaces, integrated 2.400~2.483GHz universal ISM band wireless transceiver chip, embedded baseband communication protocol. The chip only needs a small number of peripheral devices such as resistors and capacitors to realize various intelligent speech product hardware solutions, which is a low-cost wireless system solution.

CI231 series chips use industrial design standards, with high environmental reliability, chip operating temperature range between -40°C to +85°C, in line with MSL3 humidity sensitivity level, in line with IEC 61000-4-2 4KV contact discharge test standards, in line with FCC electromagnetic compatibility standards, Comply with ROHS and REACH environmental standards.

CI231 series chip adopts the 3-generation BNPU technology of Chipintelli, which supports DNN\TDNN\RNN\CNN and other neural networks and parallel vector operations, and can realize the functions of speech recognition, voice print recognition, command word self-learning, speech detection and deep learning noise reduction, with strong echo cancellation and environmental noise suppression ability. The chip solution also supports Chinese, English, Japanese and other global languages, and can be widely used in household appliances, lighting, toys, wearable devices, industrial, automotive and other product fields to achieve speech interaction and control and various intelligent speech solution applications.

Please click: ☞CI2311 chip datasheet ☞CI2312 chip datasheet

Table G-1 Chip Information

Chip model FLASH capacity RAM capacity Package information
CI2311 1MByte 640KByte TSSOP24(7.8mm*6.4mm*1.2mm)
CI2312 2MByte 640KByte TSSOP24(7.8mm*6.4mm*1.2mm)

Note: CI2312 chip built-in Flash capacity is larger, can support a larger capacity of neural network model and more broadcast and other functions, with better noise reduction effect, CI2311 and CI2312 chips do not support OTA upgrade function, and due to Flash capacity, such as support voice print recognition, do not support speech recognition.

Some applicable product fields of CI231 Serial chips:：

  • Smart home appliances

  • Smart toys

  • Intelligent lighting

  • Intelligent wearable

  • Intelligent industry

  • Smart car

CI231系列芯片应用框图

Figure G-1 Chip Application Block Diagram

The chip features are as follows:

  • Wireless features

    • speechsensitivity of 1Mbps mode can reach -90dbm; Maximum output power +8dBm
    • With hardware auto answer and auto retransmission functions
    • Fast channel switching, can achieve multi-channel frequency modulation algorithm
    • Supports BLE broadcasting

  • Neural network processor BNPU V3

    • Adopt 3-generation hardware BNPU technology, support DNN\TDNN\RNN\CNN and other neural networks and parallel vector operations, can achieve speech recognition, voice print recognition, command word self-learning, speech detection and deep learning noise reduction functions

  • CPU

    • 32-bit high-performance CPU with a maximum operating frequency of 240MHz
    • 32-bit single-period multiplier, supporting DSP expansion acceleration

  • Memory

    • Built-in 640KB SRAM
    • Built-in 512bit eFuse
    • Built-in Flash up to 2MB

  • Audio interface

    • Built-in high performance low power Audio Codec module, support dual-channel ADC sampling and single-channel DAC playback
    • Supports Automatic Level Control (ALC)
    • support 8 kHz / 16 kHz / 24 kHz / 32 kHz, 44.1 kHz, 48 kHz sampling rate
    • Supports one PDM interface for connecting to one or two digital MEMS microphones

  • Power management unit PMU

    • Built-in 3 high-performance Ldos, no need to add a power chip, only a small amount of peripheral resistance container
    • Support 5V power supply direct input, the minimum power supply range supports 3.6V input, the maximum power supply range supports 5.5V input

  • Clock

    • 16MHz external crystal oscillator

  • SAR ADC

    • 2 12bit SAR ADC input channels, sampling frequency up to 1MHz
    • ADC IO multiplexes functions with digital GPIO

  • Peripherals and timers

    • 2-channel UART ports, supporting a maximum of 3 baud rate
    • 1-channel IIC interface, which can be expanded by external IIC devices
    • 3-channel PWM interface, light control and motor applications can be driven directly
    • Built-in four groups of 32-bit timers
    • Built-in 1 Independent watchdog (IWDG)
    • Built-in 1 set of window watchdog (WWDG)

  • GPIO

    • Supports seven GPIO ports and can be used as the main control IC
    • Each GPIO port can be configured with the interrupt function
    • Some GPIOs support direct communication of wide-voltage 5V level signals without external level conversion but require external resistance pulled to 5V

  • Software development support

    • provide complete software development kit, application example and speech development platform online production firmware, and other functions, for details, please visit:https://aiplatform.chipintelli.com

  • Firmware burning and protection

    • Supports UART upgrade and firmware protection

  • EMC and ESD

    • Good EMC design, support FCC standards
    • Internal ESD enhanced design, can pass 4KV contact discharge test

  • ROHS and REACH

    • The use of environmentally friendly materials to support ROHS and REACH testing

  • Package and operating temperature range

    • Package form：TSSOP24，the size is 7.8mm long, 6.4mm wide, 1.2mm high
    • Working environment temperature:-40℃ to 85℃