Pin

Name

Description

J1-1

GND

This pad is a signal and power supply ground.

J1-2

VIN

This is the power supply input pad. The allowed input voltage range is 2.6 to 14 V.

J1-3

VOUT

VOUT tracks 50 to 100 mV below VIN when VIN is in the range of 2.6 to 3.1 V. When VIN is in the range of 3.1

to 14 V, VOUT is regulated at 3.0 Vdc. Up to 10 mA can be supplied from this pad for powering external circuits

lated output voltage.

J1-4

BIND

This pad is connected to a logic input on the microcontroller, and is configured with a weak pull-up. When this pin

is momentarily grounded (to J1-1 or J1-10, the module is placed into the bind mode, allowing this module to be

associated with other modules to form a network.

J1-5

DIGITAL IN

This pad is connected to a logic input on the microcontroller, and is configured with a weak pull-up, allowing

both logic signals and contact closures referenced to J-1 or J-10 to be read. The value of this input is sent over

the RF channel as a response to an RF command. The input voltage range on this pad is 0 to VOUT. Applying

a voltage outside of this range may damage the module.

J1-6

ANALOG IN

This pad in the input to the microcontroller’s 10-bit analog-to-digital (ADC) converter. The ADC input range is 0

to VOUT, referenced to J1-1 or J1-10. The input voltage range on this pad is 0 to VOUT. Applying a voltage

outside of this range may damage the module. The ADC reading is sent over the RF channel as a response to

an RF command.

J1-7

DIGITAL OUT

This pad is connected to a logic output on the microcontroller through a 1 kilohm resistor, which provides

short-circuit protection. The value of this output is set or read over the RF channel as a response to an RF com-

mand.

J1-8

SERIAL RX

This pad is connected to the module’s serial data input (USART). Data to this pin is received at 9.6 kb/s, using

8 data bits, no parity, and one stop bit. The input voltage range on this pad is 0 to VOUT. Applying a voltage

outside of this range may damage the module.

J1-9

SERIAL TX

This pad is connected to the module’s serial data output (USART) through a 1 kilohm resistor, which provides

short-circuit protection. Data from this pad is sent at 9.6 kb/s, using 8 data bits, no parity, and one stop bit.

J1-10

GND

This pad is a signal and power supply ground.

J2-1

GND

This pad is a ground for the antenna port.

J2-2

ANT

This pad is the antenna port.

J2-3

GND

This pad is a ground for the antenna port.

3

DM1800-434MB I/O Pad Descriptions