Matrix LED Display Driver

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5

80

85

95

90

100

105

2.5

3.5

3.0

4.0

4.5

5.0

5.5

DEAD CLOCK OSCILLATOR FREQUENCY

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

0.95

0.97

0.96

0.99

0.98

1.00

1.01

2.5

3.5

4.0

3.0

4.5

5.0

5.5

OUTPUT SOURCE CURRENT

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

WAVEFORMS AT O2 (PIN 3) AND O14

(PIN 28) V+ = 3.3V, 8/16 INTENSITY

GROUND FOR

ANODE

(PIN 014)

GROUND FOR

CATHODE

(PIN 03)

200µs/div

Typical Operating Characteristics (continued)

Pin Description

PIN

SSOP

PDIP

NAME

FUNCTION

1, 2, 3, 6–14, 23, 24

1, 2, 3, 7–15, 26, 27

O0 to O13

LED Cathode Drivers. O0 to O13 outputs sink current from

the display’s cathode rows.

4, 5, 17

4, 5, 6, 19

GND

Ground

15

17

ISET

Segment Current Setting. Connect ISET to GND through

16

18

AD1

Address Input 1. Sets device slave address. Connect to

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

See Table 3.

—

16, 25

N.C.

Not Connected

18

20

BLINK

Blink Output. Output is open drain.

19

21

OSC

Multiplex Clock Input. To use internal oscillator, connect

drive OSC with a 1MHz to 8MHz CMOS clock.

20

22

AD0

Address Input 0. Sets device slave address. Connect to

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

See Table 3.

21

23

SDA

I

2

C-Compatible Serial Data I/O

22

24

SCL

I

2

C-Compatible Serial Clock Input

25–31, 34, 35, 36

28–34, 38, 39, 40

O14 to O23

LED Anode Drivers. O14 to O23 outputs source current to

the display’s anode columns.

32, 33

35, 36, 37

V+

Positive Supply Voltage. Bypass V+ to GND with a 47µF

bulk capacitor and a 0.1µF ceramic capacitor.