MAX6955 데이터 시트보기 (PDF) - Maxim Integrated

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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 

MAX6955

2-Wire Interfaced, 2.7V to 5.5V

LED Display Driver with I/O

Expander and Key Scan

Typical Operating Characteristics

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

INTERNAL OSCILLATOR FREQUENCY

vs. TEMPERATURE

4.4

RSET = 56kΩ

CSET = 22pF

4.2

INTERNAL OSCILLATOR FREQUENCY

vs. SUPPLY VOLTAGE

4.4

RSET = 56kΩ

CSET = 22pF

4.2

INTERNAL OSCILLATOR WAVEFORM

AT OSC AND OSC_OUT PINS

MAX6954 toc03

RSET = 56kΩ

CSET = 22pF

OSC

4.0

4.0

0V

3.8

3.6

-40 -10 20 50 80 110

TEMPERATURE (°C)

DEAD CLOCK OSCILLATOR FREQUENCY

vs. SUPPLY VOLTAGE

110

RSET = 56kΩ

105

CSET = GND

100

95

90

85

80

2.5 3.0 3.5 4.0 4.5 5.0 5.5

SUPPLY VOLTAGE (V)

GPIO SINK CURRENT

vs. TEMPERATURE

45

40

VCC = 5.5V

35

OUTPUT = LOW

VPORT = 0.6V

30

25

20

VCC = 3.3V

15

VCC = 2.5V

10

5

0

-40 -10 20 50 80 110

TEMPERATURE (°C)

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3.8

OSC_OUT

0V

3.6

2.5 3.0 3.5 4.0 4.5 5.0 5.5

SUPPLY VOLTAGE (V)

SEGMENT SOURCE CURRENT

vs. SUPPLY VOLTAGE

1.02

100ns/div

OSC: 500mV/div

OSC_OUT: 2V/div

WAVEFORM AT PINS O0 AND O18,

MAXIMUM INTENSITY

MAX6954 toc06

1.00

O0

0.98

0V

0.96

0.94

0.92

2.5

VLED = 1.8V

3.0 3.5 4.0 4.5 5.0 5.5

SUPPLY VOLTAGE (V)

PORT INPUT PULLUP CURRENT

vs. TEMPERATURE

0.5

OUTPUT = HIGH

VPORT = 1.4V

0.4

VCC = 5.5V

0.3

O18

0V

KEY_A

1V/div

200µs/div

KEY-SCAN OPERATION

(KEY_A AND IRQ)

MAX6954 toc09

0.2

0V

VCC = 3.3V

0.1

VCC = 2.5V

IRQ

0V

0

-40 -10 20

50 80 110

TEMPERATURE (°C)

400µs/div

KEY_A: 1V/div

IRQ: 2V/div

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