MAX6955AAX+ datasheet(5/40 Pages) MAXIM

Part #	MAX6955AAX+

Description	2-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan

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Manufacturer	MAXIM [Maxim Integrated Products]

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MAX6955

2-Wire Interfaced, 2.7V to 5.5V

LED Display Driver with I/O

Expander and Key Scan

Maxim Integrated | 5

www.maximintegrated.com

INTERNAL OSCILLATOR FREQUENCY

vs. TEMPERATURE

TEMPERATURE (

°C)

110

80

50

20

-10

3.8

4.0

4.2

4.4

3.6

-40

RSET = 56k

Ω

CSET = 22pF

SUPPLY VOLTAGE (V)

5.0

4.5

4.0

3.5

3.0

2.5

5.5

INTERNAL OSCILLATOR FREQUENCY

vs. SUPPLY VOLTAGE

3.8

4.0

4.2

4.4

3.6

RSET = 56k

Ω

CSET = 22pF

100ns/div

OSC: 500mV/div

OSC_OUT: 2V/div

MAX6954 toc03

OSC

0V

OSC_OUT

INTERNAL OSCILLATOR WAVEFORM

AT OSC AND OSC_OUT PINS

RSET = 56k

Ω

CSET = 22pF

DEAD CLOCK OSCILLATOR FREQUENCY

vs. SUPPLY VOLTAGE

85

90

95

100

105

110

80

SUPPLY VOLTAGE (V)

5.0

4.5

4.0

3.5

3.0

2.5

5.5

RSET = 56k

Ω

CSET = GND

0.94

0.96

0.98

1.00

1.02

0.92

SEGMENT SOURCE CURRENT

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

5.0

4.5

4.0

3.5

3.0

2.5

5.5

VLED = 1.8V

1V/div

200

µs/div

MAX6954 toc06

O0

O18

WAVEFORM AT PINS O0 AND O18,

MAXIMUM INTENSITY

0V

GPIO SINK CURRENT

vs. TEMPERATURE

TEMPERATURE (

°C)

110

80

50

20

-10

5

10

15

20

25

30

35

40

45

0

-40

VCC = 5.5V

VCC = 3.3V

VCC = 2.5V

OUTPUT = LOW

VPORT = 0.6V

PORT INPUT PULLUP CURRENT

vs. TEMPERATURE

TEMPERATURE (

°C)

110

80

50

20

-10

0.1

0.2

0.3

0.4

0.5

0

-40

VCC = 5.5V

VCC = 3.3V

VCC = 2.5V

OUTPUT = HIGH

VPORT = 1.4V

400

µs/div

KEY_A: 1V/div

IRQ: 2V/div

MAX6954 toc09

KEY_A

0V

IRQ

KEY-SCAN OPERATION

(KEY_A AND IRQ)

Typical Operating Characteristics

(V+ = 3.3V, LED forward voltage = 2.4V, Typical Application Circuit, TA = +25°C, unless otherwise noted.)

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Manufacturer	Part #	Datasheet	Description
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MAX6955AAX+ Datasheet(PDF) 5 Page - Maxim Integrated Products

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