Holtek New HT45FH3T Tinypower 3D Glasses MCU

In addition to including all the original functions of the previous HT45F3T, this new device also includes a 3V low dropout voltage regulator and four level shift functions. These features extensively reduce the need for peripheral components, resulting not only in reduced cost but also reduced PCB areas.

The device includes a Flash Program Memory capacity of 2K x 16 and a Data Memory capacity of 128 bytes. The internal LDO voltage source is provided by a lithium battery and is used to provide the 3.0V system operating voltage. Its system frequency is 4MHz which can be sourced from a fully internal high accuracy 4MHz RC oscillator. Additional features include an internal 4-channel 12-bit A/D converter and a single 10-bit Periodic Timer for generating PWM outputs. This latter function is used in the DC/DC step-up voltage function to generate the required 10V power supply for the 3D Glasses. A single 16-bit Periodic Timer is provided to decode the IR signals transmitted from the TV which is then used to control the 3D Glasses on/off switch. Two additional 10-bit Compact Timer Modules are also provided to give the microcontroller a range of timer functions. A range of protection features are provided, one of these is an over voltage protection feature for detecting if the external DC/DC step-up voltage converter output voltage has exceeded the required 10V. Four level shifters are provided to convert the 3V voltages on the device I/O ports to 10V for driving the 3D Glasses and controlling the 3D Glasses on/off function. Additional protection features are provided such as Low Voltage Detector, LVD, and Low Voltage Reset, LVR, which are used for system voltage monitoring. If the system voltage falls below the LVR value, then the microcontroller will be automatically reset to avoid the possibility of unstable operation.

As the device is specially designed for 3D Glasses products, it contains many of the necessary functions to implement such applications. The device is manufactured using Holtek’s unique Tinypower architecture technology, thus providing a device with significantly lower power consumption requirements. This is a necessary feature for 3D Glasses applications as it will extend battery usage time thus reducing the time between battery charge operations. The internal A/D converter can be used to measure the battery voltage to provide a battery replacement warning function.

The device is supplied in a 16-pin SSOP package, offering the advantages of reduced PCB area, an important requirement for all 3D Glasses applications. In addition, this new device meets with industrial specifications and has excellent noise immunity as is the case with other Holtek 8-bit MCUs.