HT47C20 datasheet(5/46 Pages) HOLTEK

5 / 46 page

Pad Description

Pad No.

Pad Name

I/O

Mask

Option

Function

RES

Schmitt trigger reset input. Active low.

6~9

PA0/BZ

PA1/BZ

PA2/IR

PA3/PFD

PA4~PA7

I/O

Wake-up

Pull-high

or None

CMOS or

NMOS

Bidirectional 8-bit input/output port. The low nibble of the PA can be

configured as CMOS output or NMOS output with or without

pull-high resistors (mask option). NMOS output can be configured

as Schmitt trigger input with or without pull-high resistors. Each bit of

NMOS output can be configured as wake up input by mask option.

Of the eight bits, PA0~PA1 can be set as I/O pins or buzzer outputs

by mask option. PA2 can be set as an I/O pin or an IR carrier output

also by mask option. PA3 can be set as an I/O pin or a PFD output

also by mask option.

PB0/INT

PB1

PB2/TMR

PB3

Four-bit Schmitt trigger input port. The PB is configured as with

pull-high resistors. Of the four bits, PB0 can be set as an input pin or

an external interrupt input pin (INT) by software application. While

PB2 can be set as an input pin or a timer/event counter input pin

also by software application.

VSS

¾¾

Negative power supply, ground

IN1

CS1

RS1

RT1

Oscillation input pin of channel 1

Reference capacitor connection pin of channel 1

Reference resistor connection pin of channel 1

Resistor sensor connection pin for measurement of channel 1

IN0

CS0

RS0

CRT0

RT0

Oscillation input pin of channel 0

Reference capacitor connection pin of channel 0

Reference resistor connection pin of channel 0

Resistor/capacitor sensor connection pin for measurement of chan-

nel 0

Resistor sensor connection pin for measurement of channel 0

26~24

SEG19/COM3

COM2~COM0

1/3 or 1/4

Duty

SEG19/COM3 can be set as a segment or a common output driver

for LCD panel by mask option. COM2~COM0 are outputs for LCD

panel plate.

28~46

SEG18~SEG0

LCD driver outputs for LCD panel segments

49, 48, 47

51, 50

V1, V2, V3

C1, C2

¾¾

Voltage pump

OSC4

OSC3

Real time clock oscillators

VDD

¾¾

Positive power supply

OSC2

OSC1

Crystal or

OSC1 and OSC2 are connected to an RC network or a crystal

(by mask option) for the internal system clock.

Absolute Maximum Ratings

Supply Voltage .........................................

-0.3V to 5.5V

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

-0.3V to VDD+0.3V

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

-50°Cto125°C

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

-40°Cto85°C

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 reliabil-

ity.

HT47C20

Rev. 1.60

July 26, 2002

HT47C20 Datasheet(PDF) 5 Page - Holtek Semiconductor Inc

HT47C20 Datasheet(HTML) 5 Page - Holtek Semiconductor Inc

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