HP Pro 1105 User's Guide download pdf (Page 29)

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page 29

Secure Digital (SD) is a non-volatile

memory card format developed for use

in portable devices. It comes in dierent

packages and memory capacities. It is

mostly used for storing large amounts of

data. EasyMx PRO

™

v7 for STM32 features

the microSD card slot. The microSD form

factor is the smallest card format currently

available. It uses standard SPI user inter-

face with minimum additional electronics,

mainly used for stabilizing communication

lines which can be signicantly distorted

at high transfer rates. Special ferrite is

also provided to compensate the voltage

and current glitch that can occur when

pushing-in and pushing-out microSD card

into the socket.

Enabling microSD

In order to access microSD card, you

must enable SPI communication

lines using SW13.1 – SW13.3 DIP

switches, as well as Chip Select (CS)

and Card Detect (CD) lines using

SW14.3 and SW14.4 switches.

FP2

FERRITE

E13

10uF

VCC-3.3VVCC-MMC

C30

100nF

1

2

4

5

6

7

G

CS

Din

+3.3V

SCK

GND

Dout

CD

GND

CN27

MICROSD

VCC-MMC

R52

10K

R51

10K

SD-CS#

PH_MISO

PH_MOSI

PH_SCK

SD-CD#

R56

27

microSD

CA RD SLOT

1 2 3 4 5 6 7 8

O

N

SW13

1 2

3

4 5 6 7 8

O

N

SW14

PH_MOSI

PH_MISO

PH_SCK

SD-CS#

SD-CD#

PD15

PD3

MCU_MOSI

MCU_SCK

MCU_MISO

DATA BUS

microSD card slot

EasyMx PRO

v7

Figure 15-1: microSD card slot

connection schematics

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 43 44

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