BTM420/421

Bluetooth

Embedded Wireless Solutions Support

Center: http://ews-support.lairdtech.com

www.lairdtech.com/bluetooth

7

Laird

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Pin

Signal

Description

Voltage Specification

25

Unused

See note 3

26

Unused

See note 3

27

Unused

See note 3

28

GND

See note 3

29

ANT (BTM420)

Antenna connection (50 ohm matched)

See note 3

30

GND

See note 3

31

Unused

See note 3

32

Unused

See note 3

33

Unused

See note 3

34

Unused

See note 3

35

Unused

See note 3

36

Unused

See note 3

37

Unused

See note 3

38

Unused

39

Unused

40

Unused

41

GNd

42

GPIO1 / UART_RI

I/O for hose

VIO

43

Unused

44

Unused

45

GND

46

D-

USB D-

VUSB

47

D+

USB D+

VUSB

48

Unused

49

Unused

50

Unused

Unused pins may have internal connections and must not be connected.

Reset input is active low. Input is pulled up to VDD_IN via 22k. Minimum reset pulse width is 5 ms.

Pins 25-37 should be left not connected on modules with integrated antennae (BTM411, BTM421 and

BTM431)