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Renesas R5F21321ANSP#U1
- Part No.:
- R5F21321ANSP#U1
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- -
- Datasheet:
-
R5F21321ANSP#U1.pdf
- Description:
- 16-BIT, FLASH, R8C CPU, 20MHZ
- Quantity:
- Payment:
- Shipping:
Inventory:1,180
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Product details
Overview
R5F21321ANSP#U1 from Renesas Electronics is a 16-bit R8C/32A Group microcontroller featuring an R8C CPU core, 4 KB program flash ROM, 1 KB × 4 data flash with background operation (BGO), 512 bytes RAM, and operation at up to 20 MHz (VCC = 2.7–5.5 V). It integrates UART0/UART2, I²C-bus, SSU, LIN hardware module, 10-bit × 4-channel ADC, two comparators, and four 8-/16-bit timers - deployed in consumer appliance control subsystems requiring low-power, mixed-signal processing.
For engineers reviewing the R5F21321ANSP#U1 datasheet, R5F21321ANSP#U1 pinout, R5F21321ANSP#U1 application, or R5F21321ANSP#U1 equivalent, key selection criteria include its 20-pin LSSOP package, -20°C to +85°C ambient rating (N version), integrated LIN physical layer support via UART0 + Timer RA, BGO-enabled data flash for firmware updates without halting execution, and dual voltage detection circuits for robust power monitoring in cost-sensitive embedded control.
Technical Context
The R5F21321ANSP#U1 implements the R8C CPU core with 89 fundamental instructions, 16×16→32-bit hardware multiplier, and multiply-accumulate capability. Its memory map spans 1 Mbyte, with fixed interrupt vector table at 0FFDCh–0FFFFh and data flash blocks (A–D) mapped to 03000h–03FFFh.
Peripheral integration includes UART0 (LIN-capable), UART2 (I²C mode), SSU (shared with I²C), Timer RC with 4 capture/compare registers for PWM generation, and A/D converter with sample-and-hold and sweep mode - all controlled via dedicated SFRs in address range 0000h–002Fh and 02C00h–02FFFh.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | R8C 16-bit core with 89 instructions, 50 ns min. instruction time at 20 MHz |
| Memory | 4 KB program ROM + 4 KB data flash (1 KB × 4 blocks) + 512 bytes RAM |
| Operating Voltage | 1.8–5.5 V - supports single-supply operation across battery and line-powered systems |
| Current Consumption | Typ. 6.5 mA @ 5.0 V/20 MHz; 2.0 µA in stop mode - enables ultra-low-power sleep states |
| ADC | 10-bit resolution × 4 channels with sample-and-hold and sweep mode - suitable for multi-sensor analog acquisition |
| Timers | Timer RA (8-bit), RB (8-bit PWM), RC (16-bit with 4 compare/capture registers), RE (real-time clock) |
| Serial Interfaces | UART0 (LIN hardware support), UART2 (I²C-bus mode), SSU (shared with I²C), 1x LIN module |
Pinout & Package
Package: 20-pin LSSOP (PLSP0020JB-A), 0.65 mm pin pitch, surface-mount, JEDEC MS-013AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (P4_2) | VREF input | Analog reference voltage input for A/D converter - enables precise ratiometric measurements |
| 3 (RESET) | Active-low reset input | Hardware reset assertion resets CPU, peripherals, and SFRs - critical for safe power-up initialization |
| 4 (XOUT/XCOUT) | Crystal oscillator output | Drives external crystal (XIN/XOUT) or 32 kHz watch crystal (XCIN/XCOUT) - supports dual-clock domain timing |
| 6 (XIN/XCIN) | Crystal oscillator input | Accepts high-speed (1–20 MHz) or low-speed (32 kHz) crystal - enables RTC and main system clock independence |
| 8 (P3_7) | SDA2/TRAO | I²C-bus data line (SDA2) or Timer RA output - shared pin requires software configuration for function selection |
| 12 (P4_5) | ADTRG/INT0 | External trigger for A/D conversion start or external interrupt source - synchronizes sampling to system events |
| 17–20 (P1_3–P1_0) | AN11–AN8 | Four analog inputs for 10-bit ADC - supports simultaneous sensor monitoring in compact layouts |
Key Features
| Feature | Design Value |
|---|---|
| Background Operation (BGO) | Data flash erase/write during program execution - enables seamless firmware updates without interrupting real-time control |
| Hardware LIN Module | Integrated LIN 2.0/2.1 support via UART0 + Timer RA - eliminates external transceiver for automotive body electronics |
| Dual Voltage Detection | Voltage detection 0 and 1 with selectable thresholds - provides configurable brown-out protection for reliable reset behavior |
| Low-Power Modes | Wait mode (3.5 µA @ 3.0 V/32 kHz) and stop mode (2.0 µA) - extends battery life in portable appliances |
| On-Chip Debug | Fully supported via single-wire interface - allows in-circuit debugging without additional JTAG hardware |
Applications
| Home Appliance Motor Control | Office Equipment Power Management |
|---|---|
Use Scenario: Controlling BLDC fan motors in air purifiers using PWM-driven gate drivers. IC Role / Device Role / Timing Role: R5F21321ANSP#U1 executes closed-loop speed regulation, reads hall sensors via P1_0–P1_3, and generates complementary PWM on Timer RB outputs. Use Value: Integrated 10-bit ADC and programmable PWM reduce BOM count; BGO allows field firmware patching without motor shutdown. |
Use Scenario: Managing standby power sequencing and USB-C PD negotiation in multifunction printers. IC Role / Device Role / Timing Role: R5F21321ANSP#U1 monitors VBUS via ADC channel AN8, controls buck converter enable via P1_4, and handles I²C communication with PD controller. Use Value: Dual voltage detection ensures clean reset during AC dropout; 20-pin LSSOP fits tight PCB space near power stage. |
| Audio System Front-Panel Interface | Industrial Sensor Hub |
Use Scenario: Decoding rotary encoder inputs and driving LED indicators on AV receiver front panels. IC Role / Device Role / Timing Role: R5F21321ANSP#U1 scans key inputs KI0–KI3, drives LEDs via high-current I/O ports P1_4–P1_7, and communicates status via UART0 to main SoC. Use Value: Built-in key interrupt logic reduces polling overhead; CMOS I/O with pull-up resistors simplifies external component count. |
Use Scenario: Aggregating temperature, humidity, and CO₂ readings from analog and I²C sensors in smart building nodes. IC Role / Device Role / Timing Role: R5F21321ANSP#U1 samples thermistor via AN9, reads digital sensors over I²C-bus (SCL2/SDA2), and logs data to internal data flash. Use Value: Data flash BGO enables concurrent logging and wireless transmission; 1.8–5.5 V operation accommodates diverse sensor supply rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F21322ANSP | 8 KB program ROM, 1 KB RAM - no change in peripheral set or package | Suitable where larger firmware image size or more variable storage required | Select R5F21322ANSP when bootloader or feature-rich firmware exceeds 4 KB capacity |
| R5F21321ADSP | -40°C to +85°C operating range (D version), same memory/peripherals | Required for industrial environments with extended temperature cycling | Choose R5F21321ADSP only if ambient exceeds -20°C minimum specified for R5F21321ANSP#U1 |
Compared with R5F21321ANSP#U1, R5F21322ANSP offers double program memory without altering pinout or power profile, while R5F21321ADSP extends thermal reliability at identical functionality - neither is pin-compatible replacement but both share identical peripheral register mapping and toolchain support.
Availability
R5F21321ANSP#U1 is available at Aetrix Electronics and suitable for home appliance control, office equipment power management, and audio front-panel interfaces requiring stable component supply across long-lifecycle consumer programs.
Supply support for R5F21321ANSP#U1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.
The R8C/32A Group, including R5F21321ANSP#U1, was designed for cost-optimized, low-power embedded control in consumer electronics - emphasizing integrated peripherals, flash flexibility, and EMI/EMS robustness.
FAQ
What is the maximum operating frequency of the R5F21321ANSP#U1 and under what voltage conditions?
The R5F21321ANSP#U1 operates at a maximum frequency of 20 MHz when supplied at 2.7–5.5 V. At lower voltages (1.8–5.5 V), the maximum frequency is reduced to 5 MHz to ensure stable operation - this dual-voltage/frequency specification allows flexible power design across battery and line-powered applications.
Does the R5F21321ANSP#U1 support hardware LIN communication, and how is it implemented?
Yes, the R5F21321ANSP#U1 includes a dedicated hardware LIN module that combines UART0 and Timer RA to implement LIN 2.0/2.1 protocol - enabling direct connection to LIN transceivers without external logic. This integration reduces latency and firmware overhead compared to bit-banged implementations.
What debug interface does the R5F21321ANSP#U1 provide, and is external hardware required?
The R5F21321ANSP#U1 supports on-chip debug via a single-wire interface using the RESET pin - no external JTAG emulator is needed. Full debug capabilities including breakpoint setting, register inspection, and flash programming are available through Renesas' E1/E20 emulators and CS+ IDE.
Can the R5F21321ANSP#U1 perform flash writes while executing code from program memory?
Yes, the R5F21321ANSP#U1 supports Background Operation (BGO) for data flash - allowing erase and write operations to proceed concurrently with program execution from ROM. This capability is essential for over-the-air firmware updates in deployed devices without service interruption.
What is the operating temperature grade of the R5F21321ANSP#U1, and how is it indicated in the part number?
The R5F21321ANSP#U1 is rated for -20°C to +85°C ambient operation (N version), as denoted by the "N" in the fourth-to-last position of the part number. This grade targets consumer and commercial applications - industrial variants (D version) use "D" and extend the lower limit to -40°C.
R5F21321ANSP#U1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- -
- Core Size:
- -
- Speed:
- -
- Connectivity:
- -
- Peripherals:
- -
- Number of I/O:
- -
- Program Memory Size:
- -
- Program Memory Type:
- -
- EEPROM Size:
- -
- RAM Size:
- -
- Voltage - Supply (Vcc/Vdd):
- -
- Data Converters:
- -
- Oscillator Type:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
R5F21321ANSP#U1 FAQ
1.How can I place an order for R5F21321ANSP#U1 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F21321ANSP#U1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for R5F21321ANSP#U1 reliable?
The price and inventory of R5F21321ANSP#U1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F21321ANSP#U1 is usually 5 days.
3.What payment methods are accepted for R5F21321ANSP#U1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F21321ANSP#U1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F21321ANSP#U1?
R5F21321ANSP#U1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F21321ANSP#U1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for R5F21321ANSP#U1?
For technical support, including R5F21321ANSP#U1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F21321ANSP#U1 requirements.
6.How does Aetrix verify that R5F21321ANSP#U1 is sourced from the original manufacturer or authorized distributors?
All R5F21321ANSP#U1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that R5F21321ANSP#U1 meets industry standards.
7.What is the process for return or replacement of R5F21321ANSP#U1?
All R5F21321ANSP#U1 units undergo pre-shipment inspection (PSI). If there is an issue with R5F21321ANSP#U1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The R5F21321ANSP#U1 part is unused and in its original packaging.
Return procedure for R5F21321ANSP#U1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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