PT6315 View Datasheet(PDF) - Princeton Technology

Part Name

Description

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PT6315

VFD Driver/Controller IC

Princeton Technology 

PT6315

LED DISPLAY

PT6315 provides 4 LED Display Terminals, namely LED1 to LED4. Data is written to the LED Port starting from the least

significant bit (b0) of the port using a WRITE Command. Each bit starting from the least significant (b0) activates a

specific LED Display Terminal -- b0 corresponds LED1 Display, b1 activates LED2 and so forth. Since there are only 4

LED display terminals, bits 5 to 8 (b4 ~ b7) are not used and therefore ignored. This means that b4 to b7 does NOT in

anyway activate any LED Display, they are totally ignored.

When a bit (b0 ~ b3) in the LED Port is “1”, the corresponding LED is OFF. Conversely, when the bit is “0”, the LED

Display is turned ON. For example, Bit 1 (as designated by b0) has the value of “1”, then this means that LED1 is OFF.

It must be noted that when power is turned ON, bit 1 to bit 4 (b0 to b3) are given the value of “0” (all LEDs are turned ON).

Please refer to the diagrams below.

MSB

LSB

- - - - b3 b2 b1 b0

Not Used

LED1

LED2

LED3

LED4

COMMAND 3: ADDRESS SETTING COMMANDS

Address Setting Commands are used to set the address of the display memory. The address is considered valid if it has

a value of “00H” to “23H”. If the address is set to 24H or higher, the data is ignored until a valid address is set. When

power is turned ON, the address is set at “00H”.

Please refer to the diagram below.

MSB

LSB

1 1 b5 b4 b3 b2 b1 b0

Address: 00H to 23H

COMMAND 4: DISPLAY CONTROL COMMANDS

The Display Control Commands are used to turn ON or OFF a display. It also used to set the pulse width. Please refer to

the diagram below. When the power is turned ON, a 1/16 pulse width is selected and the displayed is turned OFF (the

key scanning is stopped).

MSB

LSB

1 0 - - b3 b2 b1 b0

V2.8

Not Relevant

Dimming Quantity Settings:

000: Pulse width = 1/16

001: Pulse width = 2/16

010: Pulse width = 4/16

011: Pulse width = 10/16

100: Pulse width = 11/16

101: Pulse width = 12/16

110: Pulse width = 13/16

111: Pulse width = 14/16

Display Settings:

0: Display Off (Key Scan Continues)

1: Display On

8

September, 2009

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