MAX6950CEE datasheet(14/19 Pages) MAXIM

Part #	MAX6950CEE

Description	Serially Interfaced, 2.7V to 5.5V, 5- and 8-Digit LED Display Drivers

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Manufacturer	MAXIM [Maxim Integrated Products]

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sequence is also reset, which might give rise to a one-

time display flicker when the register is written.

Selecting External Components RSET

and CSET to Set Oscillator Frequency

and Segment Current

The RC oscillator uses an external resistor RSET and an

external capacitor CSET to set the oscillator frequency,

fOSC. The allowed range of fOSC is 1MHz to 8MHz.

RSET also sets the peak segment current. The recom-

mended values of RSET and CSET set the oscillator to

4MHz, which makes the blink frequencies 0.5Hz and

1Hz. The recommended value of RSET also sets the

peak current to 40mA, which makes the segment cur-

rent adjustable from 2.5mA to 37.5mA in 2.5mA steps.

ISEG = KI / RSET mA

fOSC = KF / (RSET ✕ CSET + CSTRAY) MHz

Where:

KI = 2240

Serially Interfaced, +2.7V to +5.5V,

5- and 8-Digit LED Display Drivers

14

______________________________________________________________________________________

Table 14. Decode-Mode Register Examples

REGISTER DATA

DECODE CODE

ADDRESS

CODE (HEX)

D7

D6

D5

D4

D3

D2

D1

D0

HEX

CODE

No decode for digits 7–0

0x01

0

0x00

Hexadecimal decode for digit 0,

no decode for digits 7–1

0x01

0

1

0x01

Hexadecimal decode for digits

2–0, no decode for digits 7–3

0x01

0

1

0x07

Hexadecimal decode for digits

7–0

0x01

1

0xFF

Table 15. Hexadecimal Font

REGISTER DATA

ON SEGMENTS = 1

7-SEGMENT

CHARACTER

D7*

D6–D4

D3

D2

D1

D0

dp*

ab

cd

e

f

g

0X

0000

1111110

1X

0001

0110000

2X

0010

1101101

3X

0011

1111001

4X

0100

0110011

5X

0101

1011011

6X

0110

1011111

7X

0111

1110000

8X

1000

1111111

9X

1001

1111011

AX

1010

1110111

BX

1011

0011111

CX

1100

1001110

DX

1101

0111111

EX

1110

1001111

FX

1111

1000111

The decimal point segment is lit when bit D7 = 1.

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