LK204-7T-1U-WB-E Matrix Orbital, LK204-7T-1U-WB-E Datasheet - Page 42
LK204-7T-1U-WB-E
Manufacturer Part Number
LK204-7T-1U-WB-E
Description
LCD DISPLAY 20X4 I2C/RS232/TTL
Manufacturer
Matrix Orbital
Datasheet
1.LK204-7T-1U-WB.pdf
(67 pages)
Specifications of LK204-7T-1U-WB-E
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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9 Keypad
9.1 Introduction
key presses to be automatically transmitted via RS-232 or polled through I
for auto-repeating key presses. The keypad is scanned whenever a key is pressed;there is no continuous key
scan. This means that key presses are dealt with immediately without any appreciable latency. This also
prevents electrical noise which is often caused by continuous key scans.
Matrix Orbital
The LK204-7T-1Usupports up to a 7 Key, matrix style, embedded keypad and may be configured to allow
The keypad is tactile with seven keys. The value of each key is listed in the table below.
Description
Remembered
This command will perform a single transaction on the 1-wire bus in
this order:
The number of bits to be transmitted and read must be specified for this
command to be successful.
NOTE To determine what functions the device will respond to, consult the devices’ data
sheet.
No
1. Bus Reset.
2. Transmit data onto the bus.
3. Receive data from the bus.
Bit
7
6
5
4
3
2
1
0
Assume last received byte is a CRC8 and validate it
Add a CRC8 to the end of the transmitted data
Code
0x00
0x01
0x02
0x03
LK204-7T-1U
Reset bus before transaction
1-Wire Error Codes
(0 for future compatibility)
(0 for future compatibility)
Unknown 1-Wire Command
1-Wire Flags
No devices on the bus
Fatal search error
Description
Description
Unused
Success
2
C. The LK204-7T-1U also allows
37
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