MAX7219CNG 데이터 시트보기 (PDF) - Maxim Integrated

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MAX7219CNG

Serially Interfaced, 8-Digit LED Display Drivers

Maxim Integrated 

Serially Interfaced, 8-Digit LED Display Drivers

Table 2. Register Address Map

REGISTER

No-Op

Digit 0

Digit 1

Digit 2

Digit 3

Digit 4

Digit 5

Digit 6

Digit 7

Decode

Mode

Intensity

Scan Limit

Shutdown

Display

Test

ADDRESS

HEX

D15–

D12

D11 D10

D9

D8

CODE

X

0000

X0

X

0001

X1

X

0010

X2

X

0011

X3

X

0100

X4

X

0101

X5

X

0110

X6

X

0111

X7

X

1000

X8

X

1001

X9

X

1010

XA

X

1011

XB

X

1100

XC

X

1111

XF

Initial Power-Up

On initial power-up, all control registers are reset, the

display is blanked, and the MAX7219/MAX7221 enter

shutdown mode. Program the display driver prior to

display use. Otherwise, it will initially be set to scan one

digit, it will not decode data in the data registers, and

the intensity register will be set to its minimum value.

Decode-Mode Register

The decode-mode register sets BCD code B (0-9, E, H,

L, P, and -) or no-decode operation for each digit. Each

bit in the register corresponds to one digit. A logic high

selects code B decoding while logic low bypasses the

decoder. Examples of the decode mode control-regis-

ter format are shown in Table 4.

When the code B decode mode is used, the decoder

looks only at the lower nibble of the data in the digit

registers (D3–D0), disregarding bits D4–D6. D7, which

sets the decimal point (SEG DP), is independent of the

decoder and is positive logic (D7 = 1 turns the decimal

point on). Table 5 lists the code B font.

When no-decode is selected, data bits D7–D0 corre-

spond to the segment lines of the MAX7219/MAX7221.

Table 6 shows the one-to-one pairing of each data bit

to the appropriate segment line.

Table 3. Shutdown Register Format (Address (Hex) = XC)

REGISTER DATA

MODE

ADDRESS CODE

(HEX)

D7

D6

D5

D4

D3

D2

D1

D0

Shutdown

Mode

Normal

Operation

XC

X

X

X

X

X

X

X

0

XC

X

X

X

X

X

X

X

1

Table 4. Decode-Mode Register Examples (Address (Hex) = X9)

DECODE MODE

No decode for digits 7–0

Code B decode for digit 0

No decode for digits 7–1

Code B decode for digits 3–0

No decode for digits 7–4

Code B decode for digits 7–0

REGISTER DATA

HEX

D7

D6

D5

D4

D3

D2

D1

D0

CODE

0

0

0

0

0

0

0

0

00

0

0

0

0

0

0

0

1

01

0

0

0

0

1

1

1

1

0F

1

1

1

1

1

1

1

1

FF

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