Shenzhen Coban Electronics Co. Ltd. CB900 用户手册

4.2. Pin description

9

GPIO81

I/O

43

LSRSTB0

I

10

ADC1

I

44

LSDIO

I/O

11

BACKUP

I/O

45

VIO18

O

12

GND

46

VIO28

O

13

MIC-

I

47

LCM_LED-

O

14

MIC+

I

48

GPIO45

I/O

15

XMIC

I

49

GPIO61

I/O

16

SPK+

O

50

UTXD2

O

17

SPK-

O

51

URXD2

I

18

MP3_R

O

52

EINT0

I

19

MP3_L

O

53

GPIO16

I/O

20

GND

54

KCOL3

I/O

21

GPIO18

I/O

55

KCOL0

I/O

22

VCHG

I

56

KCOL2

I/O

23

GND

57

KROW4

I/O

24

USB_DP

I/O

58

KROW3

I/O

25

USB_DM

I/O

59

GND

26

GND

60

NC

27

VSIM1

O

61

GND

28

SIM1_CLK

O

62

KCOL4

I/O

29

SIM1_RST

O

63

KROW0

I/O

30

SIM1_DATA

I/O

64

KROW2

I/O

31

VMC

O

65

SCL28

I/O

32

MCDA0

I/O

66

SDA28

I/O

33

MCDA2

I/O

67

URXD1

I

34

MCCM0

I/O

68

UTXD1

O

Pin

Signal Name

Signal I/O

Description

Remark

1

GND

2

RF_ANT

I/O

RF I / O 50 ohm characteristic impedance

3

GND

4

GPIO79

I/O

General Purpose IO

Not to float

5

KP_LED

I/O

Keyboard backlight

Not to float

6

PWR_KEY

I

Low PWR_KEY for a specified time

period to boot or shutdown

Internally

pulled up to

2.8V

7

VBAT

I

I

VBAT=3.5V~4.6V

Maximum

load current

8

VBAT