STM32F071X8 datasheet(67/122 Pages) STMICROELECTRONICS

Part #	STM32F071X8

Description	ARM-based 32-bit MCU, up to 128 KB Flash, 12 timers, ADC, DAC & communication interfaces, 2.0 - 3.6 V

PDF	122 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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STM32F071x8 STM32F071xB

Electrical characteristics

Figure 16. Typical application with an 8 MHz crystal

1. REXT value depends on the crystal characteristics.

Low-speed external clock generated from a crystal resonator

The low-speed external (LSE) clock can be supplied with a 32.768 kHz crystal resonator

oscillator. All the information given in this paragraph are based on design simulation results

obtained with typical external components specified in Table 40. In the application, the

resonator and the load capacitors have to be placed as close as possible to the oscillator

pins in order to minimize output distortion and startup stabilization time. Refer to the crystal

resonator manufacturer for more details on the resonator characteristics (frequency,

package, accuracy).

Table 40. LSE oscillator characteristics (fLSE = 32.768 kHz)

Symbol

Parameter

Conditions(1)

Min(2)

Typ

Max(2) Unit

IDD

LSE current consumption

LSEDRV[1:0]=00

lower driving capability

-0.5

0.9

µA

LSEDRV[1:0]= 01

medium low driving capability

LSEDRV[1:0] = 10

medium high driving capability

1.3

LSEDRV[1:0]=11

higher driving capability

1.6

STM32F071X8 Datasheet(PDF) 67 Page - STMicroelectronics