MAX6956AAX 데이터 시트보기 (PDF) - Maxim Integrated

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MAX6956AAX

2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port LED Display Driver and I/O Expander

Maxim Integrated 

2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or

28-Port LED Display Driver and I/O Expander

HOW COMMAND BYTE AND DATA BYTE MAP INTO MAX6956's REGISTER

ACKNOWLEDGE FROM MAX6956

ACKNOWLEDGE FROM MAX6956

D15 D14 D13 D12 D11 D10 D9 D8

ACKNOWLEDGE FROM MAX6956

D7 D6 D5 D4 D3 D2 D1 D0

S

SLAVE ADDRESS

0A

COMMAND BYTE

A

DATA BYTE

AP

R/W

Figure 10. n Data Bytes Received

n BYTES

AUTOINCREMENT MEMORY WORD ADDRESS

Table 3. MAX6956 Address Map

PIN

CONNECTION

AD1

GND

AD0

GND

GND

GND

V+

SDA

GND

V+

V+

V+

V+

SDA

SDA

SDA

SDA

SCL

SCL

SCL

SCL

SCL

GND

V+

SDA

SCL

GND

V+

SDA

SCL

GND

V+

SDA

SCL

DEVICE ADDRESS

A6

A5

A4

A3

A2

A1

A0

1

0

0

0

0

0

0

1

0

0

0

0

0

1

1

0

0

0

0

1

0

1

0

0

0

0

1

1

1

0

0

0

1

0

0

1

0

0

0

1

0

1

1

0

0

0

1

1

0

1

0

0

0

1

1

1

1

0

0

1

0

0

0

1

0

0

1

0

0

1

1

0

0

1

0

1

0

1

0

0

1

0

1

1

1

0

0

1

1

0

0

1

0

0

1

1

0

1

1

0

0

1

1

1

0

1

0

0

1

1

1

1

Table 4. Autoincrement Rules

COMMAND BYTE ADDRESS RANGE

x0000000 to x1111110

x1111111

AUTOINCREMENT BEHAVIOR

Command address autoincrements after byte read or written

Command address remains at x1111111 after byte written or read

ing a write (Figure 8). The master can now read n con-

secutive bytes from the MAX6956, with the first data

byte being read from the register addressed by the ini-

tialized command byte. When performing read-after-

write verification, remember to reset the command

byte’s address because the stored control byte

address generally has been autoincremented after the

write (Table 4). Table 5 is the register address map.

Operation with Multiple Masters

If the MAX6956 is operated on a 2-wire interface with

multiple masters, a master reading the MAX6956

should use a repeated start between the write, which

sets the MAX6956’s address pointer, and the read(s)

that takes the data from the location(s). This is because

it is possible for master 2 to take over the bus after

master 1 has set up the MAX6956’s address pointer but

before master 1 has read the data. If master 2 subse-

______________________________________________________________________________________ 11

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