HT45R37V datasheet(4/90 Pages) HOLTEK

4 / 90 page

Pin Name

I/O

Configuration

Option

Description

PD0/PWM0/RC8

I/O

RC8

Bidirectional 1-bit input/output port. Software instructions deter-

mine if the pin is a CMOS output or Schmitt trigger input. A pull

high resistor can be connected to each pin using the PDPU regis-

ter. The PWM outputs, PWM0, are pin shared with pins PD0, the

function of which is chosen using the PWM registers. The C/R to F

converter inputs RC8 are shared with pins PD0.

PD1~PD7

¾¾

These seven pads are internal I/O and not bound out.

RCOUT/IN

Capacitor or resistor connection pin to RC OSC/ Oscillation input.

RREF

Reference resistor connection pin

CREF

Reference capacitor connection pin

F1O

High voltage filament output signal

BZO

High voltage buzzer complement output signals

BZI

Buzzer control Schmitt Trigger input.

¾¾

LDO regulator output

VCC

¾¾

High voltage positive power supply for driving the VFD filament,

F1O, BZO and BZO outputs. An external 10uF capacitor is recom-

mended to be connected to ground on the PCB to reduce surge

voltages.

VFD0~VFD23

High voltage grid/segment output for VFD panel

VDD/AVDD

¾¾

Positive power supply/analog positive power supply.

VSS/AVSS

¾¾

Negative power supply, ground/analog negative power supply,

ground

Note:

1. Pin PB2~PB5 are four internal pins only and not bound out and its port control register must setup this pin

as an output.

2. PB2~PB5 individual pins can be selected to have a pull-high resistor.

Absolute Maximum Ratings

Supply Voltage ...........................VSS

-0.3V to VSS+6.0V

Storage Temperature ............................

-50°Cto125°C

Input Voltage..............................VSS

-0.3V to VDD+0.3V

Operating Temperature...........................

-40°Cto85°C

VCC Supply Voltage.....................................12V to 24V

IOL Total ................................................................80mA

IOH Total ..............................................................

-80mA

Total Power Dissipation .....................................500mW

Note: These are stress ratings only. Stresses exceeding the range specified under

²Absolute Maximum Ratings² may

cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed

in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.

HT45R37V

Rev. 1.00

October 20, 2009

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