Stanley Black and Decker WTCTX User Manual

Transmit Module User’s Manual

The WTC TX (Wireless Tool Control Transmit) module
is a 433 MHz transmitter for sending DEWALT WTC
status messages. These messages are commonly used
to signal if a tool is operating which can be used to turn
on and off a remote vacuum or dust extractor
equipped with a corresponding receiver. The WTC TX
module is based on the Microchip MICRF112 UHF
transmitter and the ATTINY416 microcontroller. The
WTC TX module is classified by the FCC as a Single­modular transmitter which is a complete RF
transmission sub-assembly designed to be
incorporated into another device.

Table of Contents

1. General description

1.1 Simplified block diagram

2. Electrical characteristics

2.1 Circuit activation

3. Compliance information

-DRAFT-

1.0 General Description

PIN #

TYPE

Label

Description

RANGE

NOM

Abs. MAX

1 (Red)

PWR

PWR-IN

Power Input

5-25VDC

5VDC

30VDC

2 (White)

INPUT

TX

Triggers Transmitter

5-20VDC

5VDC

20VDC

3 (Black)

GND

GND

Power Ground

N/A

NA

N/A

The WTC TX module is a transmit only device that is externally controlled, usually from a tool
control module. The simple circuit is composed of an LDO, buffer FET, ATTINY416 microcontroller and
Microchip MICRF112 FSK data-in/RF out transmitter.

Operation:

When the buffer FET in the WTC TX receives a logic “high” signal, the transmit circuit is
activated. The module immediately sends a “Start” command and starts a 10 second timer. If the timer
reaches 10 seconds, it re-transmits the “Start” command. This automatic, reoccurring transmission cycle
is never less than 10 seconds or more than 11 seconds. If at any time the circuit is deactivated by the
user, a “Stop” command is sent, and the circuit goes to sleep. It is important to note that circuit
activation and deactivation needs to be a user initiated event.

Block Diagram:

2.0 Electrical Characteristics: