STM32F091VB 查看數據表（PDF） - STMicroelectronics

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STM32F091VB

ARM®-based 32-bit MCU, up to 256 KB Flash, CAN, 12 timers, ADC, DAC, and comm. interfaces, 2.0 - 3.6V

STMicroelectronics 

Electrical characteristics

STM32F091xB STM32F091xC

Figure 17. Typical application with an 8 MHz crystal

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1. REXT value depends on the crystal characteristics.

069

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).

Symbol

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

Parameter

Conditions(1)

Min(2) Typ Max(2) Unit

low drive capability

-

0.5 0.9

IDD

LSE current consumption

medium-low drive capability

medium-high drive capability

-

-

1

µA

-

-

1.3

high drive capability

-

-

1.6

low drive capability

5

-

-

gm

Oscillator

transconductance

medium-low drive capability

medium-high drive capability

8

-

15

-

-

µA/V

-

high drive capability

25

-

-

tSU(LSE)(3)

Startup time

VDDIOx is stabilized

-

2

-

s

1. Refer to the note and caution paragraphs below the table, and to the application note AN2867 “Oscillator design guide for

ST microcontrollers”.

2. Guaranteed by design, not tested in production.

3.

rteSaUc(LhSeEd).

is the startup

This value is

time measured

measured for a

from the moment it is enabled (by software)

standard crystal and it can vary significantly

to a stabilized 32.768 kHz oscillation

with the crystal manufacturer

is

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