Renesas R5F11TLEDFB#35

Overview

R5F11TLEDFB#35 from Renesas is a 64-pin, 64 KB flash, 6 KB RAM RL78/I1C 16-bit MCU optimized for electric AMI power meter applications. It features independent-power-supply RTC, hardware AES (not mounted), 24-bit ΔΣ A/D converter (4-channel), and operates from 1.9 V to 5.5 V across –40°C to +85°C industrial temperature range.

For engineers reviewing the R5F11TLEDFB#35 datasheet, R5F11TLEDFB#35 pinout, R5F11TLEDFB#35 application, or R5F11TLEDFB#35 equivalent, key selection criteria include ultra-low-power STOP/HALT/SNOOZE modes, LCD driver support (19–42 segments), integrated voltage detectors (VDD/VBAT/VRTC/EXLVD), and dual A/D subsystems (ΔΣ + 10-bit).

Technical Context

The R5F11TLEDFB#35 implements the RL78 CPU core with CISC architecture, 3-stage pipeline, and selectable instruction execution times from 0.03125 µs (32 MHz PLL) to 66.6 µs (15 kHz low-speed oscillator). It integrates a dedicated 24-bit ΔΣ A/D converter with four analog input pairs (ANIP0–ANIP3/ANIN0–ANIN3), supported by AVRT/AVCM/AREGC/AVSS reference circuitry.

Its peripheral set includes eight 16-bit timer channels, one independent-power-supply RTC with calendar/alarm/correction, two UARTs (one LIN-capable), two simplified I²C interfaces, one full I²C interface, two CSI units, and an Event Link Controller (ELC) supporting 22 event sources. The device uses a 64-pin LFQFP (10 × 10 mm, 0.5 mm pitch) package with EVDD0/EVSS0 port power separation.

Key Specifications

Pinout & Package

Package: 64-pin plastic LFQFP (10 × 10 mm, 0.5 mm pitch), RoHS-compliant, tray packaging (#35 = LFQFP Ver.1.1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F11TLGDFB#35, the R5F11TLEDFB#35 trades flash/RAM capacity for cost-sensitive AMI deployments; versus R5F10NLEDFB#35, it removes AES to reduce silicon area and power, making it optimal for non-secure or externally secured meter designs.

Availability

R5F11TLEDFB#35 is available at Aetrix Electronics and suitable for electric AMI power metering, industrial energy monitoring, and grid-edge sensing applications requiring stable component supply over extended product lifecycles.

Supply support for R5F11TLEDFB#35 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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices for automotive, industrial, and IoT markets.

The RL78/I1C product line is designed specifically for ultra-low-power, high-precision metrology applications in electricity, gas, and water utility meters - integrating ΔΣ A/D, RTC, LCD drivers, and robust industrial temperature operation.

FAQ

What is the maximum operating frequency of the R5F11TLEDFB#35?

The R5F11TLEDFB#35 supports a maximum CPU clock of 32 MHz via its integrated PLL. This is achieved using the high-speed on-chip oscillator (24 MHz typical) as the PLL input source. At 32 MHz, the minimum instruction execution time is 0.03125 µs - enabling real-time processing of high-resolution ΔΣ A/D samples and metrology calculations within strict timing windows.

Does the R5F11TLEDFB#35 include hardware AES encryption?

No, the R5F11TLEDFB#35 does not include hardware AES. Its part number prefix "11T" explicitly denotes absence of the on-chip AES circuit, unlike "10N" variants such as R5F10NLEDFB#35. All cryptographic operations must be performed in software on the RL78 core. This design choice reduces power consumption and die cost while maintaining full metrology functionality for non-secure metering applications.

How many analog input channels does the R5F11TLEDFB#35 support for the 24-bit ΔΣ A/D converter?

The R5F11TLEDFB#35 supports four dedicated analog input channels for its 24-bit ΔΣ A/D converter, implemented as differential pairs ANIP0/ANIN0 through ANIP3/ANIN3. These inputs are isolated from the standard 10-bit SAR A/D channels and require connection to AVRT, AVCM, AREGC, and AVSS reference pins to achieve full 24-bit effective resolution and noise rejection in precision metering applications.

What LCD segment and common drive capability does the R5F11TLEDFB#35 provide?

The R5F11TLEDFB#35 provides up to 42 segment outputs and 8 common outputs (COM0–COM7), configurable for capacitor-split, internal voltage boosting, or external resistor-division LCD drive methods. In 64-pin configuration, it supports 19–42 segments depending on COM count - sufficient for full-feature numeric + status-icon displays in single-phase and three-phase electricity meters without external LCD controllers.

What are the key low-power modes supported by the R5F11TLEDFB#35 and their typical use cases?

The R5F11TLEDFB#35 supports HALT (<1 µA), STOP (RTC + RAM retention), and SNOOZE (peripheral active, CPU halted) modes. HALT is used for deep sleep between metering intervals; STOP maintains RTC and wake-on-interrupt capability during mains failure; SNOOZE enables background LCD refresh or A/D sampling while minimizing CPU activity - collectively enabling multi-year battery life in portable or backup-powered meter nodes.