Analog-to-digital converter (ADC) RM0444
344/1390 RM0444 Rev 5
15.2 ADC main features
• High performance
– 12-bit, 10-bit, 8-bit or 6-bit configurable resolution
– ADC conversion time: 0.4 µs for 12-bit resolution (2.5Msps), faster conversion
times can be obtained by lowering resolution.
– Self-calibration
– Programmable sampling time
– Data alignment with built-in data coherency
– DMA support
• Low-power
– The application can reduce PCLK frequency for low-power operation while still
keeping optimum ADC performance. For example, 0.4 µs conversion time is kept,
whatever the PCLK frequency)
– Wait mode: prevents ADC overrun in applications with low PCLK frequency
– Auto off mode: ADC is automatically powered off except during the active
conversion phase. This dramatically reduces the power consumption of the ADC.
• Analog input channels
– 16 external analog inputs
– 1 channel for internal temperature sensor (V
SENSE
)
– 1 channel for internal reference voltage (V
REFINT
)
– 1 channel for monitoring external V
BAT
power supply pin
• Start-of-conversion can be initiated:
– By software
– By hardware triggers with configurable polarity (timer events or GPIO input
events)
• Conversion modes
– Can convert a single channel or can scan a sequence of channels.
– Single mode converts selected inputs once per trigger
– Continuous mode converts selected inputs continuously
– Discontinuous mode
• Interrupt generation at the end of sampling, end of conversion, end of sequence
conversion, and in case of analog watchdog or overrun events
• Analog watchdog
• Oversampler
– 16-bit data register
– Oversampling ratio adjustable from 2 to 256x
– Programmable data shift up to 8-bits
• ADC supply requirements: 1.62 to 3.6 V
• ADC input range: V
SSA
≤ V
IN
≤ V
REF+
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