Obsolete

Product(s)

- Obsolete

Product(s)

Obsolete

Product(s)

- Obsolete

Product(s)

Pin connections

BT-STA2425

4/13

18

UART1_RXD

I

UART data input

19

UART1_TXD

O

UART data output

20

I2C0

I/O

Ω

resistor

21

I2C1

I/O

Ω

resistor

22

USB_DN

I/O

USB data - (negative) (connect to GND if not used)

23

USB_DP

I/O

USB data + (positive) (connect to GND if not used)

24

SPI_FRM

I/O

SPI frame sync

25

SPI_CLK

I/O

SPI clock

26

SPI_TXD

O

SPI transmit data

27

SPI_RXD

I

SPI receive data (connect to GND if not used)

28

GND_S

PWR

High-quality signal ground

29

BOOT

I

External downloading enable: when low it allows the

firmware to be downloaded into the internal flash at

power-up

30

GPIO 0

I/O

General purpose input / output 0

31

GPIO 1

I/O

General purpose input / output 1

32

GPIO 2

I/O

General purpose input / output 2

33

GPIO 3

I/O

General purpose input / output 3

34

GPIO 4

I/O

General purpose input / output 4

35

GPIO 5

I/O

General purpose input / output 5

36

GPIO 6

I/O

General purpose input / output 6

Not to be used, internally used for STLC2500 wake-up

37

GPIO 7

I/O

General purpose input / output 7

38

GPIO 8

I/O

General purpose input / output 8

Not to be used, internally used for STLC2500 reset

39

GPIO 9

I/O

General purpose input / output 9

40

O

32.768 kHz digital output

41

GPIO11

I/O

General purpose input / output 11

42

GPIO12

I/O

General purpose input / output 12

43

GPIO13

I/O

General purpose input / output 13

44

GPIO14

I/O

General purpose input / output 14

45

GPIO15

I/O

General purpose input / output 15

46

1V8

PWR

1.8 V internal regulator output.

Not to be used – only for test purposes

Table 1.

Pin description (continued)

Number

Name

Type

Description