AN4467 datasheet(29/33 Pages) STMICROELECTRONICS

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AN4467

Reference design

6.2

Component references

Table 5. Mandatory components

Reference

Component name

Value

Quantity

Comments

U1A

Microcontroller

STM32L053R8(T6)

64-pin package

C8, C9, C10, C13 Capacitor

100 nF

3 ... 5

Ceramic capacitors

(decoupling capacitors)

C11

Capacitor

4.7 µF

Tantalum / chemical / ceramic capacitor

(decoupling capacitor)

C6, C12

Capacitor

1 µF

Ceramic capacitor

(LCD booster or decoupling capacitor)

Table 6. Optional components

Reference

Component name

Value

Quantity

Comments

Resistor

390

Used for HSE: the value depends on the crystal

characteristics, refer to application note AN2687

Capacitor

100 nF

Ceramic capacitor

C1, C2

Capacitor

6.8 pF

Used for LSE: the value depends on the crystal

characteristics. Fits for MC-306 32.768K-E3, which

has a load capacitance of 6 pF.

C3, C4

Capacitor

20 pF

Used for HSE: the value depends on the crystal

characteristics, refer to application note AN2687

Quartz

8 MHz

Used for HSE

Quartz

32.764 kHz

Used for LSE

CN1

SWD connector

HE10

SW1

Switch

Used to select the right boot mode

Push-button

Ferrite bead

For EMC reduction on VDDA supply, can be replaced

by a direct connection between VDD and VDDA

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