Linx Technologies HUM-xxx-DT - Manual (Page 8)

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Pin Assignments
30
31
32
1
2
3
4
20
19
18
17
16
15
14
5 6 7 8 9 10 11 12 13
29 28 27 26 25 24 23 22 21
ANT
GND
GND
GND
GND
GND
GND
ACTIVE
MODE_IND
GPIO_0
GPIO_1
GPIO_4
GPIO_3
GPIO_2
GPIO_6 GPIO_5 GPIO_7
VCCD VCCD VCCD
GND
VCCD
POWER_DOWN
CTS VCCD CMD_DATA_IN CMD_DATA_OUT LNA_EN PA_EN GND VCC RESET
Figure 13: HumDT TM Series Transceiver Pin Assignments (Top View)
Pin Descriptions
Pin Number Name I/O Description
1, 2, 3, 4, 5,
6, 7, 32
GPIO_0–GPIO_7 I/O
General Purpose I/O Lines. Each line can
be configured as either an analog input, a
digital input or a digital output. The digital
inputs can be configured to have either a
20k Ω pull up or pull down resistance or high
impedance (no resistors).
8, 10, 11, 13,
29
VCCD —
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 V
CC
. The potential exists for
random noise to affect the line and cause
unexpected operation. This risk is reduced
in simple, battery powered applications, but
should be considered in all designs.
Pin Descriptions
Pin Number Name I/O Description
9, 14, 15, 16,
17, 18, 20, 25
GND — Ground
12 POWER_DOWN I
Power Down. Pulling this line low places the
module into a low-power state. The module
is not functional in this state. Pull high for
normal operation. Do not leave floating.
19 ANTENNA — 50-ohm RF Antenna Port
21 VCC — Supply Voltage
22 RESET I
This line resets the module when pulled low.
It should be pulled high for normal operation.
This line has an internal 10k resistor to
supply, so leave it unconnected if not used.
23 LNA_EN O
Low Noise Amplifier Enable. This line is
driven high when receiving. It is intended to
activate an optional external LNA.
24 PA_EN O
Power Amplifier Enable. This line is driven
high when transmitting. It is intended to
activate an optional external power amplifier.
26 CMD_DATA_OUT O
Command Data Out. Output line for the
serial interface commands
27 CMD_DATA_IN I
Command Data In. Input line for the serial
interface commands.
28 CTS O
UART Clear To Send, active low. This line
indicates to the host microcontroller when
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.
30 MODE_IND O
This output goes high when the module
is sending or receiving data over the air.
This line can directly drive an LED for visual
indication of activity.
31 ACTIVE O
This output goes high when the module is
powered on and functional. This line can
directly drive an LED for visual indication of
activity.
Figure 14: HumDT TM Series Transceiver Pin Descriptions
Pin Descriptions