Eddy Wireless SD Cards Series Especificaciones descargar pdf (Pagina 22)

M12 Hardware Design

M12_HD_V3.3 - 21 -

Main Serial port

PIN NAME

PIN

NO.

I/O

DESCRIPTION

DC

CHARACTERISTICS

COMMENT

DTR

59

I

Data terminal

ready

VILmin=-0.3V

VILmax=

0.25×VDD_EXT

VIHmin=

0.75×VDD_EXT

VIHmax=

VDD_EXT+0.3

VOLmax=

0.15×VDD_EXT

VOHmin=

0.85×VDD_EXT

If only use TXD,

RXD and GND to

communicate,

recommended

connecting RTS to

GND via 0R

resistor and

keeping other pins

open.

RXD

61

I

Receive data

TXD

60

O

Transmit data

RTS

58

I

Request to send

CTS

57

O

Clear to send

RI

55

O

Ring indicator

DCD

56

O

Data carrier

detection

Debug port

DBG_TXD

10

O

Serial interface for

debugging only

Same as above

If unused, keep

these pins open.

DBG_RXD

9

I

UART3

TXD3

62

O

Transmit data

Same as above

If unused, keep

these pins open.

RXD3

63

I

Receive data

SD card interface

PIN NAME

PIN

NO.

I/O

DESCRIPTION

DC

CHARACTERISTICS

COMMENT

SD_DATA

1

I/O

SD serial data

VILmin=-0.3V

VILmax=

0.25×VDD_EXT

VIHmin=

0.75×VDD_EXT

VIHmax=

VDD_EXT+0.3

VOLmax=

0.15×VDD_EXT

VOHmin=

0.85×VDD_EXT

If unused, keep

these pins open.

If used,

SD_DATA is

connected to SD

card DATA0 pin.

SD_CLK

2

O

SD serial clock

VOLmax=

0.15×VDD_EXT

VOHmax=

0.85×VDD_EXT

SD_CMD

3

O

SD command

SIM interface

PIN NAME

PIN

NO.

I/O

DESCRIPTION

DC

CHARACTERISTICS

COMMENT

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