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Overview

The Talking Pen (reading pen) reference design reads code printed on paper and plays the corresponding audio. Using the industry's smallest low-power RL78/G14 microcontroller, the ID decoder and image sensor reproduce sound files corresponding to the scanned content. Audio data can be saved from a PC to a Micro SD card with a USB cable. It uses the ISL80505 single output low dropout voltage regulator (LDO) capable of providing up to 500mA of output current from an input voltage of 1. 8V to 6V. Battery charge control is performed by the ISL6294 high input voltage charger.

Talking Pen
Talking Pen
  • Minimum instruction execution time: Can be changed from high speed (0.03125μs at 32MHz operation with high-speed on-chip oscillator) to ultra-low speed (30.5μs at 32.768kHz operation with subsystem clock)
  • General-purpose registers: (8-bit register × 8) × 4 banks
  • ROM: 128KB, RAM: 16KB, data flash: 8KB
  • Selectable high-speed on-chip oscillator clock: 64/48/32/24/16/12/8/6/4/3/2/1 MHz (TYP.)
  • On-chip debug function
  • On-chip selectable power-on-reset (POR) circuit
  • On-chip voltage detector (LVD)
  • On-chip watchdog timer (operable with the dedicated low-speed on-chip oscillator)
  • On-chip key interrupt function
  • On-chip clock output/buzzer output controller
  • On-chip BCD (binary-coded decimal) correction circuit
  • I/O port: 26
  • Timer
    • 16-bit timer: 8 channels
    • 12-bit interval timer: 1 channel
  • Serial interface
    • CSI: 3 channels
    • UART: 3 channels
    • Simplified I*C communication: 3 channels
    • Multi-master I*C communication: 1 channel
  • 8/10-bit resolution A/D converter: 8 channels
  • 8/10-bit resolution D/A converter: 1 channel
  • Comparator: 2 channels
  • Data transfer controller (DTC)
  • Event link controller (ELC)
  • Standby function: HALT mode or STOP mode or SNOOZE mode
  • Power supply voltage: VDD = 1.6V to 5.5V
  • Operating ambient temperature: TA = -40 °C to +85 °C

Applications

  • HMI

Documentation

= Featured Documentation
Type Title Date
Manual - Hardware
RL78/G14 Talking Pen User's Manual
PDF 999 KB
1 item

Design & Development

Software Downloads

= Featured
Type Title Date
PCB Design Files
RL78/G14 Talking Pen Design Files
Log in to Download ZIP 1.06 MB
1 item

Videos & Training

Talking Pen

In this Quick Solution, the ultra-low power RL78/G14 microcontroller efficiently assists the ID decoder and image sensor in reproducing sound files corresponding to the scanned contents. Sound data can be stored on a micro SD card via a USB cable.

Video List
Talking Pen