STM32F091CB datasheet(18/127 Pages) STMICROELECTRONICS

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Functional overview

STM32F091xB STM32F091xC

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DocID026284 Rev 3

3.9.2

Extended interrupt/event controller (EXTI)

The extended interrupt/event controller consists of 32 edge detector lines used to generate

interrupt/event requests and wake-up the system. Each line can be independently

configured to select the trigger event (rising edge, falling edge, both) and can be masked

independently. A pending register maintains the status of the interrupt requests. The EXTI

can detect an external line with a pulse width shorter than the internal clock period. Up to 88

GPIOs can be connected to the 16 external interrupt lines.

3.10

Analog-to-digital converter (ADC)

The 12-bit analog-to-digital converter has up to 16 external and 3 internal (temperature

sensor, voltage reference, VBAT voltage measurement) channels and performs conversions

in single-shot or scan modes. 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.

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

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

3.10.2

Internal voltage reference (VREFINT)

The internal voltage reference (VREFINT) provides a stable (bandgap) voltage output for the

ADC and comparators. VREFINT is internally connected to the ADC_IN17 input channel. The

Table 3. Temperature sensor calibration values

Calibration value name

Description

Memory address

TS_CAL1

TS ADC raw data acquired at a

temperature of 30 °C (

± 5 °C),

VDDA= 3.3 V (± 10 mV)

0x1FFF F7B8 - 0x1FFF F7B9

TS_CAL2

TS ADC raw data acquired at a

temperature of 110 °C (

± 5 °C),

VDDA= 3.3 V (± 10 mV)

0x1FFF F7C2 - 0x1FFF F7C3

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