PT6964_10 Datasheet, PDF (5/15 Pages) Princeton Technology Corp – LED Driver IC

PT6964
FUNCTION DESCRIPTION
COMMANDS
A command is the first byte (b0 to b7) inputted to PT6964 via the DI/O Pin after STB Pin has changed from HIGH to
LOW State. If for some reason the STB Pin is set to HIGH while data or commands are being transmitted, the serial
communication is initialized, and the data/commands being transmitted are considered invalid.
COMMANDS 1: DISPLAY MODE SETTING COMMANDS
PT6964 provides 4 display mode settings as shown in the diagram below: As stated earlier a command is the first one
byte (b0 to b7) transmitted to PT6964 via the DI/O Pin when STB is LOW. However, for these commands, the bit 3 to bit
6 (b2 to b5) are ignored, bit 7 & bit 8 (b6 to b7) are given a value of 0.
The Display Mode Setting Commands determine the number of segments and grids to be used (10 to 13 segments, 7 to
4 grids). A display command ON must be executed in order to resume display. If the same mode setting is selected, no
command execution is take place, therefore, nothing happens.
When Power is turned ON, the 7-grid, 10-segment modes is selected.
MSB
LSB
0 0 - - - - b1 b0
Not Relevant
Display mode settings:
00: 4 digits, 13 segments
01: 5 digits, 12 segments
10: 6 digits, 11 segments
11: 7 digits, 10 segments
COMMANDS 2: DATA SETTING COMMANDS
The Data Setting Commands executes the Data Write or Data Read Modes for PT6964. The data Setting Command, the
bits 5 and 6 (b4, b5) are ignored, bit 7 (b6) is given the value of 1 while bit 8 (b7) is given the value of 0. Please refer to
the diagram below.
When power is turned ON, bit 4 to bit 1 (b3 to b0) are given the value of 0.
MSB
LSB
0 1 - - b3 b2 b1 b0
Not Relevant
Data write & read mode settings:
00: Write data to display mode
10: Read key data
Address increment mode settings (Display mode):
0: Increment address after data has been written
1: Fixed address
Mode settings:
0: Normal operation mode
1: Test mode
V1.4
5
October 2009