MAX7349AEG-T Maxim Integrated, MAX7349AEG-T Datasheet - Page 5

• Manufacturer Part Number: MAX7349AEG-T
• Description: Peripheral Drivers & Components - PCIs Low-EMI Key Switch & Sounder Controller
• Manufacturer: Maxim Integrated

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).
MAX7347
(QSOP)
10
11
12
13
14
15
16
—
—
—
—
—
—
—
—
—
1
2
3
4
5
6
7
8
9
MAX7347
(TQFN)
EP
15
16
10
11
12
13
14
—
—
—
—
—
—
—
—
1
2
3
4
5
6
7
8
9
_______________________________________________________________________________________
MAX7348
Detailed Description
2-Wire Interfaced Low-EMI Key Switch
PIN
10
11
12
13
15
17
18
19
20
14
16
—
—
—
—
—
1
2
3
4
7
8
9
5
6
MAX7349
(QSOP)
10
11
14
15
16
18
20
21
22
23
17
19
12
13
24
—
2
3
4
5
8
9
6
7
1
MAX7349
(TQFN)
EP
23
24
11
12
13
15
17
18
19
20
14
16
22
10
21
1
2
5
6
7
8
3
4
9
COL2/PORT2 Column Output to Key Matrix or GPO
COL3/PORT3 Column Output to Key Matrix or GPO
COL4/PORT4 Column Output to Key Matrix or GPO
COL7/PORT7 Column Output to Key Matrix or GPO
COL6/PORT6 Column Output to Key Matrix or GPO
COL5/PORT5 Column Output to Key Matrix or GPO
SOUNDER
ALERT
NAME
ROW0
ROW1
ROW2
ROW3
ROW4
ROW5
ROW6
ROW7
COL1
COL0
GND
SDA
AD0
SCL
INT
V+
and Sounder Controllers
EP
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
Row Input from Key Matrix. Leave open circuit if unused.
Row Input from Key Matrix. Leave open circuit if unused.
Row Input from Key Matrix. Leave open circuit if unused.
Row Input from Key Matrix. Leave open circuit if unused.
Row Input from Key Matrix. Leave open circuit if unused.
Row Input from Key Matrix. Leave open circuit if unused.
Row Input from Key Matrix. Leave open circuit if unused.
Row Input from Key Matrix. Leave open circuit if unused.
Column Output to Key Matrix
Column Output to Key Matrix
Ground
I 2 C-Compatible Serial Data I/O
I 2 C-Compatible Serial Clock Input
Active-Low Interrupt Output. Output is open drain.
Positive Supply Voltage. Bypass V+ to GND with a
0.047µF or higher ceramic capacitor.
S ound er D r i ver Outp ut. Typ i cal l y connect a p i ezo- cer am i c
sound er or other tr ansd ucer fr om thi s outp ut to g r ound .
O utp ut i s p ush- p ul l .
Address Input 0. Sets device slave address. Connect to
GND, V+, SDA, or SCL to give four logic combinations.
See Table 3.
Alert Input. Connect to GND or V+ if unused.
E xp osed P ad d l e. Inter nal l y connected to GN D . C onnect to
a l ar g e g r ound p l ane to m axi m i ze ther m al p er for m ance.
FUNCTION
Pin Description
5