STM32F373RBT7(2013) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STM32F373RBT7
(Rev.:2013)

ARM Cortex-M4 32b MCU+FPU, up to 256KB Flash+32KB SRAM timers, 4 ADCs (12/16-bit), 3 DACs, 2 comp., 2.0-3.6 V operation

STMicroelectronics 

Electrical characteristics

STM32F37xxx

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 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).

Symbol

Table 41. LSE oscillator characteristics (fLSE = 32.768 kHz)

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

LSEDRV[1:0] = 10

medium high driving capability

8

-

15

-

-

µA/V

-

tSU(LSE)(3) Startup time

LSEDRV[1:0]=11

higher driving capability

VDD is stabilized

25

-

-

-

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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