2-Wire Interfaced Low-EMI Key Switch

and Sounder Controllers

2

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ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

(All voltages referenced to GND.)

V+ ............................................................................-0.3V to +4V

COL2/PORT2–COL7/PORT7 ....................................-0.3V to +4V

SDA, SCL, AD0, ALERT, INT ....................................-0.3V to +6V

All Other Pins................................................-0.3V to (V+ + 0.3V)

DC Current on COL2/PORT2–COL7/PORT7 ......................25mA

DC Current on SOUNDER ................................................±25mA

GND Current .......................................................................80mA

16-Pin QSOP (derate 8.3mW/°C above +70°C)...........666mW

16-Pin TQFN (derate 16.9mW/°C above +70°C).......1349.1mW

20-Pin QSOP (derate 9.1mW/°C above +70°C)...........727mW

24-Pin QSOP (derate 9.5mW/°C above +70°C)...........761mW

24-Pin TQFN (derate 20.8mW/°C above +70°C).......1666.7mW

Junction Temperature ......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

ELECTRICAL CHARACTERISTICS

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Operating Supply Voltage

V+

2.4

3.6

V

Operating Supply Current

I+

All key switches open

75

100

µA

Shutdown Supply Current

6.44

10

µA

SOUNDER Output High Voltage

V+ -

0.45

V

SOUNDER Output Low Voltage

0.15

V

SOUNDER Frequency Accuracy

1.2

%

Key-Switch Source Current

28

40

µA

Key-Switch Source Voltage

0.35

0.65

V

Key-Switch Resistance

(Note 3)

1

k

Ω

Startup Time from Shutdown

57

200

µs

Output Low Voltage

COL2/PORT2 to COL7/PORT7,

INT Output

0.15

V

Input voltage

≤ V+

-1

+1

Input Leakage Current Alert

Input voltage

> V+

-5

+5

µA

Input High Voltage ALERT

2.2

V

Input Low Voltage ALERT

0.8

V

SERIAL-INTERFACE SPECIFICATIONS

Serial Bus Timeout

With bus timeout enabled

20

68

ms

Input High Voltage

SDA, SCL, AD0

2.2

V

Input Low Voltage

SDA, SCL, AD0

0.6

V

Input voltage

≤ V+

-1

+1

Input Leakage Current

SDA, SCL, AD0

Input voltage

> V+

-5

+5

µA