HT45F23/HT45F43
8-Bit Flash MCU with Op Amps & Comparators
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12-bit Audio DAC output
PFD/Buzzer for audio frequency generation
Internal 2.4V/3.3V LDO
Low voltage reset function
Low voltage detect function
16-pin NSOP, 20/24-pin SSOP package types
The two devices share the same functional features but differ in their internal operational
characteristics as shown in the following table:
Op-Amp Quiescent
Current
Op-amp Gain
Bandwidth
LDO 3.3V Current
Consumption
Op-amp/Comparator
Offset Calibration
Device
HT45F23
HT45F43
2MHz typ.
5kHz typ.
200mA typ.
1.5mA typ.
50mA typ.
7mA typ.
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General Description
The HT45F23 and HT45F43 are Flash Memory Tinypower A/D type 8-bit high performance RISC
architecture microcontrollers. The HT45F43 device has low power internal operational amplifiers
making it more suitable for power sensitive products. The HT45F23 device has a higher gain
bandwidth product than the HT45F43 at the expense of power consumption making it more suitable
for higher frequency applications.
Offering users the convenience of Flash Memory multi-programming features, these devices also
include a wide range of functions and features. Other memory includes an area of RAM Data Memory
as well as an area of EEPROM memory for storage of non-volatile data such as serial numbers,
calibration data etc.
Analog features include an integrated multi-channel Analog to Digital Converter, dual Pulse Width
Modulation outputs, dual Operational Amplifiers , dual Comparators , one internal 2.4V or 3.3V LDO
(Low Drop Out) for voltage regulator and a 12-bit DAC for voice output application, communication
with the outside world is catered for by including fully integrated SPI or I2C interface functions, two
popular interfaces which provide designers with a means of easy communication with external
peripheral hardware. Protective features such as an internal Watchdog Timer, Low Voltage Reset and
Low Voltage Detector coupled with excellent noise immunity and ESD protection ensure that reliable
operation is maintained in hostile electrical environments.
A full choice of HXT, LXT, ERC, HIRC and LIRC oscillator functions are provided including a fully
integrated system oscillator which requires no external components for its implementation. The
unique Holtek TinyPower technology also gives the devices extremely low current consumption
characteristics, an extremely important consideration in the present trend for low power battery
powered applications. The usual Holtek MCU features such as power down and wake-up functions,
oscillator options, programmable frequency divider, etc. combine to ensure user applications require a
minimum of external components.
The inclusion of flexible I/O programming features, Time-Base functions along with many other
features ensure that the devices will find excellent use in applications such as electronic metering,
environmental monitoring, handheld instruments, household appliances, electronically controlled
tools, motor driving, home security systems related to PIR products, CO detector, Smoke detector and
many others.
Rev. 1.20
8
September 15, 2011
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
