STM32L152C6 datasheet(24/121 Pages) STMICROELECTRONICS

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Functional overview

STM32L151x6/8/B, STM32L152x6/8/B

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Doc ID 17659 Rev 8

3.10

ADC (analog-to-digital converter)

A 12-bit analog-to-digital converters is embedded into STM32L15xxx devices with up to 24

external channels, performing conversions in single-shot or scan mode. In scan mode,

automatic conversion is performed on a selected group of analog inputs.

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 selected 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 trigger and injection trigger, 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 (TSENSE) 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

stored by ST in the system memory area, accessible in read-only mode.

Table 6.

Temperature sensor calibration values

Calibration value name

Description

Memory address

TSENSE_CAL1

TS ADC raw data acquired at

temperature of 30 °C,

VDDA= 3 V

0x1FF8 007A-0x1FF8 007B

TSENSE_CAL2

TS ADC raw data acquired at

temperature of 110 °C

VDDA= 3 V

0x1FF8 007E-0x1FF8 007F

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