Date: 02/11/2011

8-bit OTP MCU with internal touch-key functions for measurement apps

Holtek has announced its new 8-bit OTP dual slope A/D type MCU, the HT46R75D-3. With internal touch-key functions and other peripheral functions, this new device is suitable for the processing of analog signals from bridge sensor applications such as scales, pressure gauges, thermometers, humidity meters, tyre pressure gauges etc.

Holtek says the HT46R75D-3 contains 8K of OTP Program Memory, 192 bytes of Data Memory, two 16-bit timers and one 8-bit timer together with a Buzzer output, up to 22 I/O pins, an external wake up and interrupt touch functions. The internal LCD driver circuit can drive LCD panels of up to 192 pixels. Central to the device is its dual slope A/D converter, a function which is used in measuring systems and which includes an amplifier, voltage follower, integrator, comparator, charge-pump and 3.3V output regulator.

In addition, the device includes four touch-key functions and an external vibration sensor amplifier circuit. This combination of features provides a solution for measuring applications, which require touch key and vibration switch functions. The internal Watchdog, Low Voltage Detect and Low Voltage Reset functions, offer excellent safeguards and protection against low system voltages and noisy electrical environments