TM8704

tenx technology, inc.

Ver1.0

03/12/01

5

PIN DESCRIPTION

Name

I/O

Description

VDD1,2,3

P

LCD supply voltage, and positive supply voltage.

RESET

I

Input pin for external reset request signal, built-in internal pull-down resistor.

INT

I

Input pin for external interrupt request signal.

. Falling edge or rising edge triggered is defined by mask option.

. Internal pull-down or pull-up resistor is defined by mask option.

TEST

Test signal input pin.

CUP1,2

O

Switching pins for supply the LCD driving voltage to the VDD1,2,3 pins.

. Connect the CUP1 and CUP2 pins with non-polarized electrolytic capacitor when chip

operated in 1/2 or 1/3 bias mode.

. In no BIAS mode, leave these pins opened.

XIN

XOUT

I

O

Time base counter frequency (clock specified. LCD alternating frequency. Alarm signal

frequency) or system clock oscillation.

. 32KHz Crystal oscillator or External RC for SLOW ONLY or DUAL by mask option.

. In FAST ONLY mode option, connect an external resistor could compose a RC

oscillator.

COM1~5

O

Output pins for driving the common pins of the LCD panel.

SEG1-12,24-

35

O

Output pins for driving the LCD panel segment.

IOA1-4

I/O

Input / Output port A.(muxed with SEG24~27)

IOB1-4

I/O

Input / Output port B.(muxed with SEG28~30)

IOC1-4

I/O

Input / Output port C. (muxed with SEG32~35)

BZB/BZ

O

Output port for alarm generator

GND

P

Negative supply voltage.