Datasheet

Electrical characteristics STM32F051x4 STM32F051x6 STM32F051x8
62/121 DocID022265 Rev 6
Figure 17. Typical application with an 8 MHz crystal
1. R
EXT
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 36. 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).
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Table 36. LSE oscillator characteristics (f
LSE
= 32.768 kHz)
Symbol Parameter Conditions
(1)
Min
(2)
Typ Max
(2)
Unit
I
DD
LSE current consumption
LSEDRV[1:0]=00
lower driving capability
-0.50.9
µA
LSEDRV[1:0]= 01
medium low driving capability
--1
LSEDRV[1:0] = 10
medium high driving capability
--1.3
LSEDRV[1:0]=11
higher driving capability
--1.6
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