Ci2451 — 2.4GHz Wireless SoC with Integrated 8-bit RISC MCU

The Ci2451 is a highly integrated System-on-Chip combining a 2.4 GHz wireless transceiver and an 8-bit RISC MCU. Ideal for cost-sensitive, low-power wireless applications.

Key Applications

• Wireless mouse & keyboard

• Wireless remote controls

• Motion-sensing devices

• Wireless data modules

• Remote-controlled toys

Main Features

Wireless Transceiver

• 2.4 GHz ISM band

• Modulation: GFSK/FSK

• Data rates: 2 Mbps / 1 Mbps / 250 kbps

• BLE 4.2 PHY & MAC compatible

• RX sensitivity: –80 dBm @ 2 Mbps

• TX power up to +11 dBm

• Up to 10 MHz tri-wire SPI interface

8-bit RISC MCU

• 1K × 14-bit EPROM

• 48 bytes SRAM

• 6 configurable GPIOs

• 1× 8-bit PWM output

• 1× buzzer driver (BZ1)

• Built-in POR, LVR, WDT

• Dual-clock (high/low speed) with four operating modes: Normal / Slow / Standby / Halt

• 38 / 57 kHz IR carrier (polarity configurable)

• 6 hardware interrupts

Other Features

• Wide supply voltage: 2.1–3.6 V

• Ultra-low sleep current: 4 µA (WDT on, MCU halted, radio off)

• Minimal external components

• SOP-8 package

Perfect for ultra-compact, low-cost, battery-powered 2.4 GHz wireless peripherals.