Renesas R5F2138AWJFP#W4

Overview

R5F2138AWJFP from Renesas Electronics is a 16-bit R8C/38W Group single-chip microcontroller with CAN interface, 96 KB flash ROM, 1 KB × 4 data flash (BGO-enabled), and 8 KB RAM in an 80-pin LQFP package. It operates at up to 20 MHz (50 ns min instruction time), integrates 20-channel 10-bit ADC, six timer modules including three-phase PWM-capable Timer RD, and supports automotive-grade ambient temperature (−40°C to +85°C). It targets vehicle LAN and industrial FA control systems requiring integrated CAN, LIN, and high-precision timing.

For engineers reviewing the R5F2138AWJFP datasheet, R5F2138AWJFP pinout, R5F2138AWJFP application, or R5F2138AWJFP equivalent, key selection criteria include its dual CAN/LIN capability, background operation for data flash updates, 75 CMOS I/O ports with pull-up selectability, and ISO 11898-1-compliant CAN module with 16 mailboxes - all critical for real-time embedded control in constrained EMI environments.

Technical Context

The R5F2138AWJFP implements the R8C CPU core with 89 fundamental instructions and hardware multiplier (16×16→32-bit) enabling efficient motor control math and signal processing. Its clock system includes XIN oscillator, high-speed on-chip oscillator (frequency-adjustable), and low-speed on-chip oscillator, supporting wait/stop modes and oscillation stop detection for robust power management.

Peripheral integration centers on deterministic real-time control: Timer RD provides reset-synchronous and complementary PWM for three-phase inverters (6-pin output), while UART2 supports I²C-bus and IE-bus protocols. The CAN module operates as a full-featured controller (not transceiver) with message filtering, FIFO buffering, and error handling per ISO 11898-1.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (PLQP0080KB-A), 0.5 mm pitch, 12 mm × 12 mm body. Pin assignment follows Renesas standard top-view layout with dedicated CAN, LIN, UART, ADC, and timer I/O functions distributed across Ports P0–P9.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with R5F2138AXJFP and R5F2138AYJFP, the R5F2138AWJFP uniquely combines CAN interface and BGO-enabled data flash in a single J-grade device - making it the only option among these three for automotive body controllers needing both network connectivity and runtime reconfigurability.

Availability

R5F2138AWJFP is available at Aetrix Electronics and suitable for automotive body control modules, industrial motor drives, vehicle diagnostic interfaces, and smart power distribution units requiring stable component supply across extended product lifecycles.

Supply support for R5F2138AWJFP 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, and power solutions for automotive, industrial, and IoT markets.

The R8C/38W Group, including R5F2138AWJFP, was designed for cost-sensitive, real-time embedded control in automotive and factory automation - emphasizing CAN/LIN integration, low-power operation, and robust peripheral sets for motor and sensor interfacing.

FAQ

What is the operating temperature range for the R5F2138AWJFP?

The R5F2138AWJFP is rated for −40°C to +85°C (J version), validated for use in automotive cabin and industrial control cabinet environments. This range is confirmed in Table 1.2 of the R01DS0014EJ0100 datasheet and applies to all electrical specifications unless otherwise noted. The R5F2138AWJFP maintains full functionality across this range without derating.

Does the R5F2138AWJFP include an integrated CAN transceiver?

No, the R5F2138AWJFP contains only a CAN controller compliant with ISO 11898-1. It requires an external CAN transceiver (e.g., TJA1042, SN65HVD230) to drive the physical bus. Pins P6_1 (CTX0) and P6_2 (CRX0) are dedicated controller outputs/inputs and must be connected to the transceiver's TXD/RXD lines per Renesas hardware design guidelines.

How many ADC channels does the R5F2138AWJFP support, and what is their resolution?

The R5F2138AWJFP features a 10-bit successive approximation ADC with 20 input channels (AN0–AN19), as specified in Table 1.2. It includes sample-and-hold circuitry and sweep mode for automatic channel sequencing - enabling continuous monitoring of multiple analog sensors (e.g., temperature, current, position) without CPU intervention.

Can the R5F2138AWJFP perform flash memory updates while running application code?

Yes, the R5F2138AWJFP supports Background Operation (BGO) for its 4 KB data flash (1 KB × 4 blocks). This allows erase/write operations to execute concurrently with main program execution - essential for runtime calibration updates or firmware patching. BGO is disabled for program ROM; updates there require CPU suspension.

What debug interface does the R5F2138AWJFP provide?

The R5F2138AWJFP supports on-chip debug via Renesas' single-wire debug interface (SWD), compatible with E2 emulator Lite and E2 studio IDE. This enables full breakpoint control, register inspection, and flash programming without requiring JTAG pins - reducing pin count and simplifying board layout compared to legacy debug solutions.