32-bit ARM Cortex™-M3 MCU
HT32F1251/51B/52/53
Power Management
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Single 3.3 V power supply: 2.7 V to 3.6 V
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Integrated 1.8 V LDO regulator for core and peripheral power supply
BAT battery power supply for RTC and backup registers
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Three power domains: 3.3V, 1.8V and Backup
Four power saving modes: Sleep, Deep-Sleep1, Deep-Sleep2, Power-Down
The Power consumption can be regarded as one of the most important issues for many embedded
system applications. Accordingly the Power Control Unit, PWRCU, in these devices provides many
types of power saving modes such as Sleep, Deep-Sleep1, Deep-Sleep2 and Power-Down mode.
These operating modes reduce the power consumption and allow the application to achieve the best
trade-off between the conflicting demands of CPU operating time, speed and power consumption.
(NOTE: HT32F1251B does not support VBAT battery power supply).
Analog to Digital Converter
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12-bit SAR ADC engine
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Up to 1 Msps conversion rate - 1 μs at 56 MHz, 1.17 μs at 72 MHz
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8 external analog input channels
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Supply voltage range: 2.7 V ~ 3.6 V
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Conversion range: VSSA ~ VDDA
A 12-bit multi-channel ADC is integrated in the device. There are a total of 10 multiplexed
channels, which include 8 external channels on which the external analog signals can be supplied,
and 2 internal channels. If the input voltage is required to remain within a specific threshold
window, the Analog Watchdog function will monitor and detect the signal. An interrupt will then
be generated to inform that the input voltage is higher or lower than the set thresholds. There are
three conversion modes to convert an analog signal to digital data. The ADC can be operated in
one shot, continuous and discontinuous conversion modes.
Analog Operational Amplifier/Comparator
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2 Operational Amplifiers or 2 Comparator functions which are software configurable
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Supply voltage range: 2.7 V ~ 3.6 V
Two Operational Amplifiers/Comparators (OPA/CMP) are implemented within the devices. They
can be configured either as Operational Amplifiers or as Analog Comparators. When configured as
comparators, they are capable of asserting interrupts to the NVIC.
Rev. 1.00
9 of 35
May 27, 2011
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
