MAX7219EWG(2003) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX7219EWG
(Rev.:2003)

Serially Interfaced, 8-Digit LED Display Drivers

Maxim Integrated 

MAX7219/MAX7221

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

D15–

D12

X

X

X

X

X

X

X

X

X

ADDRESS

D11 D10 D9

000

000

001

001

010

010

011

011

100

HEX

D8 CODE

0 0xX0

1 0xX1

0 0xX2

1 0xX3

0 0xX4

1 0xX5

0 0xX6

1 0xX7

0 0xX8

X

1 0 0 1 0xX9

X

1 0 1 0 0xXA

X

1 0 1 1 0xXB

X

1 1 0 0 0xXC

X

1 1 1 1 0xXF

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) = 0xXC)

REGISTER DATA

MODE

ADDRESS CODE

(HEX)

D7

D6

D5

D4

D3

D2

Shutdown

Mode

Normal

Operation

0xXC

0xXC

X

X

X

X

X

X

X

X

X

X

X

X

Table 4. Decode-Mode Register Examples (Address (Hex) = 0xX9)

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

D7

D6

D5

D4

D3

D2

D1

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

1

1

1

1

1

1

1

1

1

1

Maxim Integrated

D1

D0

X

0

X

1

HEX

D0

CODE

0

0x00

1

0x01

1

0x0F

1

0xFF

7

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