New 8-bit Dual Slope HT46R72D-1A/HT46R73D-1A A/D MCU Product Release

08/08/2008

Adding another two devices to its Dual Slope A/D Type 8-bit OTP microcontroller range, Holtek is delighted to announce the release of the HT46R72D-1A and HT46R73D-1A. Fully compliant with industrial specifications, these devices include an OTP Partial Lock function. With a range of other useful functions integrated within the devices, they will find applications in areas such as measurement systems that utilise bridge type sensors, such as those for measuring pressure, temperature and humidity. Products could include weight scales, pressure measurement devices, thermometers, humidity meters and tyre pressure gauges etc.

The HT46R72D-1A and HT46R73D-1A specification includes 2K or 4K of internal OTP Program Memory, 96 bytes of internal RAM Data Memory, both 8-bit and 16-bit Timer/Event Counters and a hardware buzzer driver output to name but a few of the available functions. A total of 12 I/O pins are provided, which have a wake-up function, and one of which also serves as an external interrupt pin. Also included is an internal LCD driver circuit, capable of driving up to a 64-pixel LCD panel, which with its high current drive capability, is more effective at driving larger LCD panels. The HT46R72D-1A and HT46R73D-1A also include a Dual Slope Analog to Digital Converter, which is a broad application measurement type of A/D. The internal A/D function includes an operational amplifier, a voltage follower, integrator and comparator functions. Additionally, a charge pump and 3.3V voltage regulator are also integrated within the device. To minimise any adverse effects due to external noise or conditions of low voltages, both devices also includes a watchdog timer and LVD/LVR (Low Voltage Detect/Low Voltage Reset) functions.

As is the case with all of Holtek’s microcontrollers, the devices are fully supported by Holtek’s suite of hardware and software development tools. These tools include an in-circuit emulator, device programmer and the Windows based software development system, known as the HT-IDE3000. The system includes a C-language compiler, as well as a range of other application guides etc, all of which combine to ensure that application programs are written and debugged as efficiently as possible.

The devices are supplied in 52-pin QFP packages and chip form for which volume orders can be accepted and samples provided for customer evaluation.