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EVM-900-DT

HumDT™ Series RF Transceiver Module

Unspecified 

Pin Assignments

MODE_IND

ACTIVE

GPIO_0

GPIO_1

GPIO_2

GPIO_3

GPIO_4

29 28 27 26 25 24 23 22 21

30

20

31

19

32

18

1

17

2

16

3

15

4

14

5 6 7 8 9 10 11 12 13

GND

ANT

GND

GND

GND

GND

GND

Figure 13: HumDTTM Series Transceiver Pin Assignments (Top View)

Pin Descriptions

Pin Descriptions

Pin Number

Name

1, 2, 3, 4, 5,

6, 7, 32

GPIO_0–GPIO_7

8, 10, 11, 13,

29

VCCD

I/O Description

General Purpose I/O Lines. Each line can

be configured as either an analog input, a

I/O

digital input or a digital output. The digital

inputs can be configured to have either a

20kΩ pull up or pull down resistance or high

impedance (no resistors).

These lines are inputs that are pulled

to supply internally. They can be left

unconnected, but boards in noisy

environments or with noisy components in

—

the same product are recommended to pull

these lines to

random noise

VtoCCa. fTfehcet

potential exists for

the line and cause

unexpected operation. This risk is reduced

in simple, battery powered applications, but

should be considered in all designs.

– 10 –

Pin Descriptions

Pin Number

9, 14, 15, 16,

17, 18, 20, 25

Name

GND

12

POWER_DOWN

19

ANTENNA

21

VCC

22

RESET

23

LNA_EN

24

PA_EN

26

CMD_DATA_OUT

27

CMD_DATA_IN

28

CTS

30

MODE_IND

31

ACTIVE

I/O Description

— Ground

Power Down. Pulling this line low places the

I

module into a low-power state. The module

is not functional in this state. Pull high for

normal operation. Do not leave floating.

— 50-ohm RF Antenna Port

— Supply Voltage

This line resets the module when pulled low.

I

It should be pulled high for normal operation.

This line has an internal 10k resistor to

supply, so leave it unconnected if not used.

Low Noise Amplifier Enable. This line is

O driven high when receiving. It is intended to

activate an optional external LNA.

Power Amplifier Enable. This line is driven

O high when transmitting. It is intended to

activate an optional external power amplifier.

O

Command Data Out. Output line for the

serial interface commands

I

Command Data In. Input line for the serial

interface commands.

UART Clear To Send, active low. This line

indicates to the host microcontroller when

O the module is ready to accept data. When

CTS is high, the module is busy. When CTS

is low, the module is ready for data.

This output goes high when the module

O

is sending or receiving data over the air.

This line can directly drive an LED for visual

indication of activity.

This output goes high when the module is

O

powered on and functional. This line can

directly drive an LED for visual indication of

activity.

Figure 14: HumDTTM Series Transceiver Pin Descriptions

– 11 –

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