PT6355 Просмотр технического описания (PDF) - Princeton Technology

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PT6355

VFD Driver/Controller IC

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PT6355

RESET FUNCTION

To enable the Reset Function of PT6355, the /RESET Pin must be set at “L” Level for 2 µs or more. After which the

/RESET Pin reverts back to “H” Level and then the reset is released. The /RESET Pin returned to an “H” Level when the

OSC1 oscillation is stable and the voltage of the power source is between 4.0 V and 5.5 V. It is very important to note

that the Reset Input Voltage is less than 0.2VCC when the VCC is 4 V. The figure below is an example of a RESET Circuit.

OSCILLATION CIRCUIT

An oscillation circuit is constructed by connecting a capacitor between Oscillation pins -- OSC1 and OSC2 and VSS. The

Oscillation Pins -- OSC1 and OSC2 must be as “SHORT” as possible. If you are supplying a clock externally, apply the

clock signal to OSC1 and make OSC2 Pin floating or open. Please refer to the diagram below.

SETTING UNUSED PINS

If a segment or grid pin will not be used, just leave it floating or open. The Analog Input Pin, however, must be connected

to VCC or VSS via a resistor if it is not used. Please refer to the table below.

Pin Type

Connection

Segment

Open

Grid

Open

Analog Input

Connect to VCC or VSS via a resistor

V1.6

13

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