STM32L151XE datasheet(25/134 Pages) STMICROELECTRONICS

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STM32L151xE STM32L152xE

Functional overview

3.9

LCD (liquid crystal display)

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

VDD. 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

•

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

3.10

ADC (analog-to-digital converter)

A 12-bit analog-to-digital converters is embedded into STM32L151xE and STM32L152xE

devices with up to 40 external channels, performing conversions in single-shot or scan

mode. In scan mode, automatic conversion is performed on a selected group of analog

inputs with up to 28 external channels in a group.

The ADC can be served by the DMA controller.

An analog watchdog feature allows very precise monitoring of the converted voltage of one,

some or all scanned channels. An interrupt is generated when the converted voltage is

outside the programmed thresholds.

The events generated by the general-purpose timers (TIMx) can be internally connected to

the ADC start triggers, to allow the application to synchronize A/D conversions and timers.

An injection mode allows high priority conversions to be done by interrupting a scan mode

which runs in as a background task.

The ADC includes a specific low-power mode. The converter is able to operate at maximum

speed even if the CPU is operating at a very low frequency and has an auto-shutdown

function. The ADC’s runtime and analog front-end current consumption are thus minimized

whatever the MCU operating mode.

3.10.1

Temperature sensor

The temperature sensor (TS) generates a voltage VSENSE that varies linearly with

temperature.

The temperature sensor is internally connected to the ADC_IN16 input channel which is

used to convert the sensor output voltage into a digital value.

The sensor provides good linearity but it has to be calibrated to obtain good overall

accuracy of the temperature measurement. As the offset of the temperature sensor varies

from chip to chip due to process variation, the uncalibrated internal temperature sensor is

suitable for applications that detect temperature changes only.

To improve the accuracy of the temperature sensor measurement, each device is

individually factory-calibrated by ST. The temperature sensor factory calibration data are

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