Si24R03 — Ultra-Low-Power RISC-V + 2.4 GHz Wireless SoC

Si24R03 is a highly integrated low-power SoC combining a RISC-V RV32IMAC MCU and a 2.4 GHz ISM-band transceiver. Designed for ultra-low-power wireless applications with minimal external components.

Key Features

MCU Core

• RISC-V RV32IMAC (2.6 CoreMark/MHz), up to 32 MHz

• 4 kB SRAM, 32 kB Flash + 4.5 kB NVM (≥100k cycles)

• 13–16 bit Σ-Δ ADC (8 ch, 0–4.8 V), 1.2 V reference

• 2× UART (up to 1 Mbps), SPI Master, I²C Master

• 2× advanced timers (Timer1 with 4× complementary PWM)

• RTC, WUP, IWDG, LVD, TRNG, up to 11 GPIOs

• 4 low-power modes, down to <0.6 μA (WDT on)

• Supply: 1.8–5.5 V

2.4 GHz Transceiver

• Frequency: 2400–2525 MHz (126× 1 MHz channels)

• Modulation: GFSK/FSK

• Data rates: 2 / 1 / 0.25 Mbps

• RX sensitivity: –83 dBm @ 2 Mbps

• TX power: up to +7 dBm

• RX current: 15 mA @ 2 Mbps

• TX current: 12 mA @ 0 dBm

• Shutdown: 1 μA | Standby: 15 μA | Startup: ≤130 μs

• Built-in smart ARQ engine, auto-ACK/retransmit

• High-PSRR LDO, 1.9–3.6 V stable operation

General

• Ultra-low total power: 1.6 μA (deep sleep + radio off)

• QFN32 5×5 mm package

• –40°C to +85°C

• Minimal BOM, mature IDE + libraries, full demo board & technical support

Ideal for battery-powered sensors, remotes, wearables, smart home, and industrial IoT devices.