UM1817 datasheet(16/58 Pages) STMICROELECTRONICS

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Hardware layout and configuration

UM1817

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DocID026902 Rev 3

CAUTION:

JP8 and JP12 are not allowed to be opened; otherwise STM32F091VCT6 would be

damaged due to a lack of power supply on its power pins.

Risk of explosion if battery is replaced by an incorrect type. Dispose of used batteries

according to the instructions.

2.4

Clock source

Two clock sources are available on the STM32091C-EVAL evaluation board for

STM32F091VCT6 and RTC embedded.

•

X1, 32 KHz crystal for embedded RTC

•

X2, 8 MHz crystal with socket for STM32F091VCT6 microcontroller, it can be removed

from socket when internal RC clock is used.

See Table 5 and Table 6.

Table 4. Low-voltage limitation

Peripheral

Component

IO name

Low-voltage limitation

Audio amplifier

U18

Audio input

2.2 V (VDDA)

Microphone amplifier

U15

Audio output

2.7 V (VDDA)

CAN

CN5

CAN

3 V (VDDIO2)

Smartcard

CN19

USART2

2.7 V (VDD)

Table 5. 32 KHz crystal X1 related solder bridges

Jumper

Description

SB11

PC14 is connected to the 32KHz crystal when SB11 is open.

(Default setting)

PC14 is connected to extension connector CN6 when SB11 is closed. In such case

R54 must be removed to avoid disturbance due to the 32 Khz quartz.

SB12

PC15 is connected to the32 KHz crystal when SB12 is open.

(Default setting)

PC15 is connected to extension connector CN6 when SB12 is closed. In such case

R55 must be removed to avoid disturbance due to the 32 Khz quartz.

Table 6. 8MHz crystal X2 related solder bridges

Jumper

Description

SB13

PF0 is connected to the 8 MHz crystal when SB13 is open.

(Default setting)

PF0 is connected to the extension connector CN7 when SB13 is closed. In such

case C18 and X2 must be removed.

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