MAX7349ATG+ datasheet(5/29 Pages) MAXIM

Part #	MAX7349ATG+

Description	2-Wire Interfaced Low-EMI Key Switch and Sounder Controllers

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Manufacturer	MAXIM [Maxim Integrated Products]

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2-Wire Interfaced Low-EMI Key Switch

and Sounder Controllers

_______________________________________________________________________________________

5

Detailed Description

The MAX7347/MAX7348/MAX7349 are microprocessor

peripherals that combine a low-noise key-switch inter-

face with a piezo sounder controller. Up to 64 key

switches can be monitored and debounced with optional

autorepeat, and the key events are presented in an

eight-deep FIFO. Key-switch functionality can be traded

to provide up to one (MAX7347), three (MAX7348), or six

(MAX7349) open-drain logic outputs. (Table 1).

The piezo sounder controller generates a variety of

audio tones. Tones are programmable for frequency

and duration, and may be intermittent, two tone, or con-

tinuous. The piezo sounder controller can be config-

ured to deliver an automatic, customizable sound on

every key press to provide a udible key-click feedback.

Interrupt requests can be configured to be issued on

every key-press event, or can be limited to a maximum

rate to prevent overloading the microprocessor with

Pin Description

MAX7347

(QSOP)

MAX7347

(TQFN)

MAX7348

MAX7349

(QSOP)

MAX7349

(TQFN)

NAME

FUNCTION

1

15

1

2

23

ROW0

Row Input from Key Matrix. Leave open circuit if unused.

2

16

2

3

24

ROW1

Row Input from Key Matrix. Leave open circuit if unused.

3

1

3

4

1

ROW2

Row Input from Key Matrix. Leave open circuit if unused.

4

2

4

5

2

ROW3

Row Input from Key Matrix. Leave open circuit if unused.

5

3

7

8

5

ROW4

Row Input from Key Matrix. Leave open circuit if unused.

6

4

8

9

6

ROW5

Row Input from Key Matrix. Leave open circuit if unused.

7

5

9

10

7

ROW6

Row Input from Key Matrix. Leave open circuit if unused.

8

6

10

11

8

ROW7

Row Input from Key Matrix. Leave open circuit if unused.

9

7

11

14

11

COL2/PORT2 Column Output to Key Matrix or GPO

10

8

12

15

12

COL1

Column Output to Key Matrix

11

9

13

16

13

COL0

Column Output to Key Matrix

12

10

15

18

15

GND

Ground

13

11

17

20

17

SDA

I2C-Compatible Serial Data I/O

14

12

18

21

18

SCL

I2C-Compatible Serial Clock Input

15

13

19

22

19

INT

Active-Low Interrupt Output. Output is open drain.

16

14

20

23

20

V+

Positive Supply Voltage. Bypass V+ to GND with a

0.047µF or higher ceramic capacitor.

—

5

6

3

COL3/PORT3 Column Output to Key Matrix or GPO

—

6

7

4

COL4/PORT4 Column Output to Key Matrix or GPO

—

14

17

14

SOUNDER

Sounder Driver Output. Typically connect a piezo-ceramic

sounder or other transducer from this output to ground.

Output is push-pull.

——16

19

16

AD0

Address Input 0. Sets device slave address. Connect to

GND, V+, SDA, or SCL to give four logic combinations.

See Table 3.

—

1

22

COL7/PORT7 Column Output to Key Matrix or GPO

—

12

9

COL6/PORT6 Column Output to Key Matrix or GPO

—

13

10

COL5/PORT5 Column Output to Key Matrix or GPO

—

24

21

ALERT

Alert Input. Connect to GND or V+ if unused.

—EP

—

EP

Exposed Paddle. Internally connected to GND. Connect to

a large ground plane to maximize thermal performance.

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