27963 Parallax Inc, 27963 Datasheet - Page 2

• Manufacturer Part Number: 27963
• Description: SOLUTIONS CUBED: MEMKEY
• Manufacturer: Parallax Inc

Specifications of 27963

• Accessory Type: Keypad Encoder
• Product: Microcontroller Accessories
• For Use With/related Products: BASIC Stamp®
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Miniature Engineering Modules – MEMKey
MEMKey
Serial and PC/AT Keypad
Encoder Module
FEATURES
u 4X5 Matrix
u Programmable rows and columns
u Programmable key values
u PC/AT or serial output
u Automatic or polled key reporting
u Programmable debounce and typematic
u 64 Bytes of user-accessible EEPROM
u Standard TTL levels
u No external components
u Easy-to-use SIP package
DESCRIPTION
encoder. Using a jumper, the MEMKey supports either
a simple serial communication protocol or the standard
PC/AT
communication mode, it can decode key matrixes of up
to 4 columns by 5 rows. The rows and columns can
be programmed to match the row-column configuration
of any off the shelf keypad.
programmed to any standard value. In addition, the
debounce
programmable. All programmable values are stored in
non-volatile memory so they are saved when power is
off.
MEMKey communicates at 2400 baud, 8N1, LSB first,
asynchronous. This can be either a 1 wire or a 2 wire
interface.
memory which is made available to the user as
scratch pad space.
SOLUTIONS CUBED
530-891-8045
times
The MEMKey is a fully programmable keypad
The value returned by the MEMKey can be
When operating with the serial protocol, the
In addition, there are 64 bytes of EEPROM
communication
time
and
typematic
protocol.
rate
In
are
either
fully
PIN CONFIGURATION AND
MECHANICAL SPECS
1.600
0.250
1.450
VDD
GND
TM
FM
KEY
K0 à K8 Key matrix connections.
1.025
0.150
0.150
Component Side
All Dimensions In Inches
Pin Separation
Pin Diameter
Module Height
Mounting Holes
0.425
Power supply pin
Ground pin
Serial Communication to
master from MEMKey (open
collector). CLOCK line in
PC/AT communication.
Serial Communication from
master to MEMKey (open
collector). DATA line in
PC/AT communication.
Keypress output, active high,
current limited, serial mode
only.
J1
VDD GND TM FM KEY
1.025
1.725
= 0.100
K0 K1 K2 K3 K4 K5 K6 K7 K8
= 0.025 (square)
= 0.300
= 0.125
2.100
2.250
J3
MODE
J2
1