STM32F303RBT7 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STM32F303RBT7

ARM Cortex-M4F 32b MCU+FPU, up to 256KB Flash+48KB SRAM 4 ADCs, 2 DAC ch., 7 comp, 4 PGA, timers, 2.0-3.6 V operation

STMicroelectronics 

Electrical characteristics

STM32F302xx/STM32F303xx

Low-speed external clock generated from a crystal/ceramic resonator

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

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

simulation results obtained with typical external components specified in Table 41. 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 41. LSE oscillator characteristics (fLSE = 32.768 kHz)

Symbol

Parameter

Conditions(1)

Min(2) Typ Max(2) Unit

LSEDRV[1:0]=00

lower driving capability

-

0.5 0.9

IDD

LSE current consumption

LSEDRV[1:0]=01

medium low driving capability

-

LSEDRV[1:0]=10

medium high driving capability

-

-

1

µA

-

1.3

LSEDRV[1:0]=11

higher driving capability

-

-

1.6

LSEDRV[1:0]=00

lower driving capability

5

-

-

gm

Oscillator

transconductance

LSEDRV[1:0]=01

medium low driving capability

8

-

LSEDRV[1:0]=10

medium high driving capability

15

-

-

µA/V

-

LSEDRV[1:0]=11

higher driving capability

25

-

-

tSU(LSE)(3) Startup time

VDD 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. tSU(LSE) is the startup time measured from the moment it is enabled (by software) to a stabilized 32.768 kHz oscillation is

reached. This value is measured for a standard crystal and it can vary significantly with the crystal manufacturer

Note:

For information on selecting the crystal, refer to the application note AN2867 “Oscillator

design guide for ST microcontrollers” available from the ST website www.st.com.

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Doc ID 023353 Rev 5

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