LM8322 datasheet(6/42 Pages) NSC

6 / 42 page

Function

I/O

Description

CONFIG_1

Input

Slave address select input 1

GPIO_14

I/O

General-purpose I/O port 14

XTAL_OUT

Input

32.768 kHz crystal output

SLOWCLK

Input

32.768 kHz clock

XTAL_IN

Input

32.768 kHz crystal input

IRQ

Output

Interrupt request output

RESET

Input

Reset Input

A4, F4

n.a.

C3, C4,

D3, D4

GND

n.a.

Ground

7.1 TERMINATION OF UNUSED SIGNALS

TABLE 1. Termination of Unused Signals

Signal

Termination

RESET

Connect to V

CC if not driven from an external Supervisory circuit.

CONFIG_1

Connect to V

CC or GND through a pullup or pulldown resistor because the slave address is selected

by the level on this pin. This pin cannot be left unconnected.

XTAL_IN

This pin is a high-impedance input and must be connected to V

CC or GND if it is unused.

XTAL_OUT

This pin has a weak pullup and can be left open-circuit if it is unused.

KP-X[2:0]

These pins are dedicated keypad pins. In the minimum configuration, these pins are keypad inputs

with weak pullups.

KP-X[7:3]

These pins are in high-impedance mode after power-on initialization. There are two ways to handle

these pins if unused:

•

Connect to V

CC or GND.

•

Program as inputs with weak pullups or outputs.

Care must be taken when connecting to V

CC or GND. Erroneous parameters sent with the

WRITE_PORT_SEL or WRITE_PORT_STATE commands could cause excessive current

consumption. A better approach is to leave unused keyboard inputs open-circuit and use the

WRITE_PORT_SEL and WRITE_PORT_STATE commands to configure the pins as inputs with

weak pullups or outputs.

KP-X7 can only be an input. This pin should be programmed as an input with a weak pullup.

KP-Y[2:0]

These pins are dedicated keypad pins. In the minimum configuration, these pins are keypad outputs

driven low.

KP-Y[11:3]

These pins are in high-impedance mode after power-on initialization. There are two ways to handle

these pins if unused:

•

Connect to V

CC or GND.

•

Program as inputs with weak pullups or outputs

Care must be taken when connecting to V

CC or GND. Erroneous parameters sent with the

WRITE_PORT_SEL or WRITE_PORT_STATE commands could cause excessive current

consumption. A better approach is to leave unused keyboard inputs open-circuit and use the

WRITE_PORT_SEL and WRITE_PORT_STATE commands to configure the pins as inputs with

weak pullups or outputs.

PWM_0,

PWM_1

These pins must be connected to V

CC or GND if they are not used for any optional function

described in the datasheet.

PWM_2/

CONFIG_2

Connect to V

CC or GND through a pullup or pulldown resistor because the slave address is selected

by the level on this pin. This pin cannot be left unconnected.

IRQ

This pin must be connected.

LM8322 데이터시트(PDF) 6 Page - National Semiconductor (TI)

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