ISD9361RI

Overview

The ISD9361RI is a member of the Nuvoton ISD9300 series, an ARM Cortex-M0 based system-on-chip optimized for low-power audio applications. It features a core running up to 98.304MHz with 145KB Flash EPROM and 16KB SRAM. The device includes a Sigma-Delta ADC with 90dB SNR, a programmable gain amplifier (PGA) with up to 61dB gain, and a differential Class D speaker driver capable of 1W output into an 8Ω load. Operating voltage ranges from 2.4V to 5.5V, with Deep Power Down current below 1µA. It integrates multiple peripherals including UART, SPI, I2C, I2S, timers, and RTC in a 64-pin LQFP package.

Feature Summary

• Integrated high-performance audio front-end featuring a Sigma-Delta ADC with 90dB SNR and a differential PWM speaker driver delivering 1W output.
• Advanced power management supporting sub-microampere Deep Power Down modes with wake-up capabilities via dedicated pins or internal oscillators.
• Flexible memory architecture with configurable flash boundaries and pre-fetch cache for near zero-wait state execution.
• Comprehensive peripheral set including dual SPI interfaces with Quad mode support, I2S audio interface, and multiple PWM generators.

Applications

• Voice recording and playback devices
• Low-power audio messaging systems
• Interactive toys and educational electronics
• Industrial voice alert modules

Procurement Notes

Verify the specific suffix 'RI' against the manufacturer's official ordering information to confirm package type and temperature range specifications. Ensure compatibility with the required programming interface, as the device supports In-System Programming (ISP) and In-Circuit Programming (ICP) via SWD. Confirm RoHS compliance status for the specific batch if environmental regulations apply to the final assembly.

Selection Notes

Select this component when a combined microcontroller and audio codec solution is required to reduce bill-of-materials count. The integrated PGA eliminates the need for external amplification for microphone inputs. Consider the 145KB flash capacity for complex audio algorithms or large storage requirements. Evaluate the 2.4V to 5.5V operating range against the system's available power rails to determine if level shifting is necessary for other logic components.

Part Context

The ISD9361RI belongs to the ISD9300 series, which shares the same core architecture and pinout but may differ in flash memory size or specific feature subsets. This series is designed specifically for audio-centric applications where power efficiency and component integration are critical. It serves as a direct replacement for discrete MCU and audio codec combinations in compact designs.

Replacement Considerations

Direct substitutes within the ISD9300 series include parts with varying flash capacities such as ISD9300, ISD9340, or ISD9380, provided the memory requirement is met. Verify that any alternative part maintains the same 64-pin LQFP footprint and pin configuration to ensure mechanical compatibility without PCB redesign.

FAQ

How does the ISD9361RI handle microphone input without external amplifiers?

The device integrates a Programmable Gain Amplifier (PGA) with a maximum gain of 61dB and a Sigma-Delta ADC, allowing direct connection of microphones to the MIC+ and MIC- pins.

What is the minimum current consumption in Deep Power Down mode?

In Deep Power Down (DPD) mode, the device draws less than 1µA, enabling extended battery life in portable audio applications.

Can the ISD9361RI drive a speaker directly?

Yes, it includes a Differential Class D amplifier (DPWM) capable of delivering 1W of power to an 8Ω speaker load directly.