Code Mercenaries KeyWarrior24D User manual
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1. Features
• USB low speed interface
• Full USB V1.1/2.0 compliance
• Full USB HID 1.1 compliance
• Direct data input for use with microcontrollers
or simple circuits
• Supports all HID keyboard usage codes
• Modifier keys via direct control lines
• Single +5V power supply
• Low power consumption: 20mA max.
• Available as DIL24, SOIC24, and module
2. Functional Overview
KeyWarrior24D is intended for applications where
computer keyboard input has to be generated from
some kind of external data source.
Keystrokes are generated by applying the key code
and modifier key status to the KeyWarrior24D
input lines and then generating a strobe signal.
KeyWarrior24D will send the data as keyboard
input data to the host computer and issue an
acknowledge signal to indicate its readyness for
another code.
3. Pin Configuration
KeyWarrior24D-P DIL24
KeyWarrior24D-S SOIC24
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4. Pin Descriptions KeyWarrior24D
4.1 Pin Functions
D+, D-
Differential data lines of USB. Connect these
signals direct to the USB cable or type B plug.
Vreg
Regulated 3V output, to be used only for the
purpose of powering the USB D- pull up resistor.
Do not use this pin as a supply for any other circuit
than the pull up resistor.
D0..D7
Data inputs, the HID usage code for the keystroke
must be put on those lines prior to pulling /STRB
low.
Inputs with internal pull up resistors.
/L-ALT, /L-GUI, /R-Ctrl, /R-Shft, /R-ALT,
R-GUI
Inputs for modifier keys. For ALT and GUI left
and right keys are available, for Ctrl and Shift only
right keys.
Pull an input low to activate the corresponding
modifier key for the next /STRB signal.
Inputs with internal pull up resistors.
/STRB
Strobe input to tell KeyWarrior24D to send a key
code. Pulling this line low triggers KeyWarrior24D
to send the usage code and modifiers as a
keystroke.
Input with internal pull up resistor.
/ACK
Handshake output. This line gets pulled low by
KeyWarrior24D when it has accepted the data on
D0..7 and modifier inputs.
Open drain with internal pull up resistor.
HOLD
Pull this pin high to keep modifier key status active
until next /STRB signal.
Input with internal pull down resistor.
Pull to GND
This pin is used during production of the
KeyWarrior chips, connect to GND.
GND
Power supply ground.
Vcc
Supply voltage.
Name
I/O
Type
Pins
Description
D+, D-
D0, D1, D2,
D3, D4, D5,
D6, D7
I/OIspecial
inputs with internal
pull up resistor
16, 15
1, 2, 3, 4, 24, 23, 22,
21
USB differential data lines
Data input lines for the key code (HID usage code)
/L-ALT,
/L-GUI,
/R-Ctrl,
/R-Shft,
/R-ALT,
/R-GUI
/STRB
/ACK
HOLD
IIinputs with internal
pull up resistor
input with internal pull
up resistor
OIopen drain output with
internal pull up resistor
Input with internal pull
down
6, 19, 7, 18, 8, 17
5
Input lines for the modifier keys. Pull low to
activate modifier
Pull low to signal that keycode data is valid and
should be send
2012Gets pulled low by KW24D to signal that data has
been accepted
Pull high to hold modifier status
PullToGND
GND
Vcc
Vre gIPower supply
O
Power supply
Regulated 3V out
NC-109Used during manufacturing, connect to GND
Ground
1411Supply voltage
Power for D- pullup resistor
13
do not connect
V 1.0.0, December 2nd 2013, for chip revision 1.1.1.D and up
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5. Device Operation
KeyWarrior24D registers as a standard HID
keyboard and supports boot protocol. It does not
need any special drivers to be installed, standard
system drivers are sufficient.
The country code is 0 for not localized hardware,
which allows to use a single version of the chip for
all international keyboard layouts. Usage codes are
defined for 0 to 223, which includes all keys and
reserved codes below the modifiers, as well as the
compose keys for Asian languages and several
special keys that may or may not be supported by
individual operating systems.
5.1 Power Up
Every time the supply voltage is applied
KeyWarrior24D executes an internal reset
sequence. All internal pull up resistors are disabled
upon power up and will be activated during the
internal reset sequence.
5.2 How to use KW24D
KeyWarrior24D turns an 8 bit code and six status
lines for modifier keys into a USB keyboard data
report.
To generate a keystroke the HID usage code (see
the "KeyWarrior Scancode Tables" document for a
complete list of the keyboard usage codes) for the
required key is applied to D0..7. The status of any
modifier keys to be combined with this key is indicated by pulling the corresponding pin low.
For example if a capital "A" should be produced
put $04 on D0..7 and pull down /R-Shft.
After applying the data make sure /ACK is high,
then pull down /STRB. /STRB may be pulled low
only when /ACK is high.
Then wait for KeyWarrior24D to pull down /ACK.
This signals that KeyWarrior24D has accepted the
data. Release /STRB and do not pull it low again
until /ACK has returned to high state.
All minimum setup and hold times are 0.
KeyWarrior24D will send the usage code as a short
key press.
5.3 Modifier keys
Modifier keys are input to KeyWarrior24D by
separate control lines. They can be transmitted in
combination with a key code. If only a change of
the status of the modifiers is intended apply a $00
to D0..7, which is the "idle" code for no key
pressed.
If the HOLD input is pulled high the status of the
modifier keys will stay valid until the next status is
passed to KeyWarrior24D on the next falling edge
of /STRB. When HOLD is low (default status due
to internal pull down resistor) the modifier keys
will return to idle after the keystroke.
V 1.0.0, December 2nd 2013, for chip revision 1.1.1.D and up
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