Holtek takes pleasure in the announcement of a new infrared learning type remote control device, the HT45R22E. Device features include a 2.2V~3.6V operating voltage range, 4Kx15 of OTP Program Memory, 1K×8 bytes of EEPROM, 128 bytes of RAM Data Memory, an internal R-type LCD COM driver, pin-shared I/Os with expansion of 22 pins, two internal Operational Amplifiers and one comparator. The system frequency can be generated by an external high frequency crystal, an external 32kHz crystal, an external RC circuit or a fully internal RC oscillator circuit with a fixed frequency of 4095kHz. Other functions include fast wake-up, dual frequency switching, RTC function etc.
For infrared learning type remote control applications, the internal OPA and comparator in the HT45R22E can implement the voltage amplifier circuitry required by the learning circuit. The internal RC oscillator removes the need for external crystal or resonator oscillator components. In implementing a dual frequency switching function, battery power supply life can be extended considerably. By integrating all these features into a single device, the HT45R22E forms a first class solution for infrared learning type remote control products.
CPU Features
- Operating voltage: fSYS= 4MHz: 2.2V~3.6V
- Program Memory: 4K×15
- Data Memory: 128×8
- Embedded 1024×8 EEPROM
- Up to 1us instruction cycle with 4MHz system clock at VDD= 3V
- Idle/Sleep mode and wake-up functions to reduce power consumption
- Oscillator types:
- External high freuency Crystal -- HXT
- External RC -- ERC
- Internal high frequency RC -- HIRC
- External low frequency crystal -- LXT
- Internal low frequency RC -- LIRC
- Four operational modes: Normal, Slow, Idle, Sleep
- Fully integrated internal 4095kHz oscillator requires no external components
- Watchdog Timer function
- LIRC oscillator function for watchdog timer
- All instructions executed in one or two instruction cycles
- Table read instructions
- 63 powerful instructions
- 4-level subroutine nesting
- Bit manipulation instruction
- Low voltage reset function
- 20/24-pin SOP package types
Peripheral Features
- Up to 22 bidirectional I/O lines
- Software controlled 4-SCOM lines LCD COM driver with 1/2 bias
- External interrupt input shared with an I/O line
- Two 8-bit programmable Timer/Event Counter with overflow interrupt and prescaler
- Time-Base function
- Programmable Frequency Divider - PFD shared with I/O line
- Two integrated operational amplifiers with interrupt function - one with programmable gain control
- Single comparator with interrupt and low power consumption
The device includes a highly noise immune Holtek 8-bit MCU, which with its internal watchdog timer and LVR protection features, has the ability to counter any erroneous device operation. The HT45R22E is supplied in both 20 and 24-pin SOP package types.
