HT45R37V
TinyPower C/R-F Type 8-Bit OTP MCU
TM
Technical Document
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Application Note
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HA0075E MCU Reset and Oscillator Circuits Application Note
Features
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Operating voltage:
2-channel 12-bit resolution A/D converter
1-channel 12-bit PWM output shared with I/O line
Low voltage reset function - 2.1V, 3.15V, 4.2V
Low voltage detect function - 2.2V, 3.3V, 4.4V
Bit manipulation instruction
f
f
f
f
SYS=32768Hz: 2.2V~5.5V
SYS=4MHz: 2.2V~5.5V
SYS=8MHz: 3.0V~5.5V
SYS=12MHz: 4.5V~5.5V
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OTP Program Memory: 4K´15
RAM Data Memory: 160´8
15-Bit table read instructions
63 powerful instructions
16 bidirectional I/O lines
Up to 0.33ms instruction cycle with 12MHz system
clock at VDD=5V
Three external interrupt input shared with I/O lines
Two 8-bit programmable Timer/Event Counter
with overflow interrupt and 7-stage prescaler
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All instructions executed in one or two machine
cycles
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External C/R to F converter
Idle/Sleep mode and wake-up functions to reduce
power consumption
9-Channel Capacitor/Resistor sensor inputs
Integrated Crystal, IRC, ERC and RTC oscillator
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Time-Base and RTC interrupt
Fully integrated internal RC oscillator available with
three frequencies: 4MHz, 8MHz or 12MHz
Integrated DC 24V to 5V LDO regulator
Buzzer and filament 5V to 24V output level shifter
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Watchdog Timer function
24-bit shift register/latch for VFD panel driving 24
grid/segment outputs
LIRC or RTC oscillator function for watchdog timer
PFD and Buzzer for audio frequency generation
Dual Serial Interfaces: SPI and I2C
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Integrated 3-line serial VFD interface for
grid/segment display control
4 operating modes: normal, slow, idle and sleep
6-level subroutine nesting
52-pin QFP package type
General Description
The HT45R37V is a TinyPowerTM C/R to F Type 8-bit high
performance RISC architecture microcontroller designed
especially for VFD applications. As a C/R to F type of
MCU, the device can interface to 9 external C or R type
sensors and convert their values to a frequency value for
processing. In addition its internal A/D converter allows
the device to interface directly to analog signals and its in-
tegrated dual channel Pulse Width Modulators allows con-
trol of external motors, LEDs etc.
addition to low power consumption, high performance,
I/O flexibility and low-cost, provides the device with the
versatility for a wide range of products in the home appli-
ance and industrial application areas. Some of these
products could include electronic metering, environmen-
tal monitoring, handheld instruments, electronically con-
trolled tools, motor driving in addition to many others.
The unique Holtek TinyPower technology also gives the
devices extremely low current consumption characteris-
tics, 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 applica-
tions require a minimum of external components.
The device is specifically designed for VFD applications
that interface directly to VFD panels.
With their fully integrated SPI and I2C functions, design-
ers are provided with a means of easy communication
with external peripheral hardware. The benefits of inte-
grated A/D, C/R to F converter, and PWM functions, in
Rev. 1.00
1
October 20, 2009
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