Datasheet

DS10198 Rev 8 45/270
STM32L476xx Functional overview
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The main features of the touch sensing controller are the following:
• Proven and robust surface charge transfer acquisition principle
• Supports up to 24 capacitive sensing channels
• Up to 3 capacitive sensing channels can be acquired in parallel offering a very good
response time
• Spread spectrum feature to improve system robustness in noisy environments
• Full hardware management of the charge transfer acquisition sequence
• Programmable charge transfer frequency
• Programmable sampling capacitor I/O pin
• Programmable channel I/O pin
• Programmable max count value to avoid long acquisition when a channel is faulty
• Dedicated end of acquisition and max count error flags with interrupt capability
• One sampling capacitor for up to 3 capacitive sensing channels to reduce the system
components
• Compatible with proximity, touchkey, linear and rotary touch sensor implementation
• Designed to operate with STMTouch touch sensing firmware library
Note: The number of capacitive sensing channels is dependent on the size of the packages and
subject to I/O availability.
3.21 Liquid crystal display controller (LCD)
The LCD drives up to 8 common terminals and 44 segment terminals to drive up to 320
pixels.
• Internal step-up converter to guarantee functionality and contrast control irrespective of
V
DD
. This converter can be deactivated, in which case the VLCD pin is used to provide
the voltage to the LCD
• Supports static, 1/2, 1/3, 1/4 and 1/8 duty
• Supports static, 1/2, 1/3 and 1/4 bias
• Phase inversion to reduce power consumption and EMI
• Integrated voltage output buffers for higher LCD driving capability
• Up to 8 pixels can be programmed to blink
• Unneeded segments and common pins can be used as general I/O pins
• LCD RAM can be updated at any time owing to a double-buffer
• The LCD controller can operate in Stop mode
3.22 Digital filter for Sigma-Delta Modulators (DFSDM)
The device embeds one DFSDM with 4 digital filters modules and 8 external input serial
channels (transceivers) or alternately 8 internal parallel inputs support.
The DFSDM peripheral is dedicated to interface the external  modulators to
microcontroller and then to perform digital filtering of the received data streams (which
represent analog value on  modulators inputs). DFSDM can also interface PDM (Pulse
Density Modulation) microphones and perform PDM to PCM conversion and filtering in
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