Rainbow-electronics MAX7360 Manual de usuario descargar pdf (Pagina 15)

C-Interfaced Key-Switch Controller and LED

Driver/GPIOs with Integrated ESD Protection

MAX7360

______________________________________________________________________________________ 15

Figure 5. Acknowledge

Figure 6. Slave Address

Slave Addresses

The MAX7360 has a 7-bit long slave address (Figure

6). The bit following a 7-bit slave address is the R/W bit,

which is low for a write command and high for a read

command.

The first 4 bits (MSBs) of the MAX7360 slave address

are always 0111. Slave address bits A3, A2, and A1

correspond, by the matrix in Table 3, to the states of the

device address input AD0, and A0 corresponds to the

R/W bit. The AD0 input can be connected to any of four

signals (GND, V

, SDA, or SCL), giving four possible

slave address pairs and allowing up to four MAX7360

devices to share the bus. Because SDA and SCL are

dynamic signals, care must be taken to ensure that AD0

transitions no sooner than the signals on SDA and SCL.

The MAX7360 monitors the bus continuously, waiting for a

START condition, followed by its slave address. When the

MAX7360 recognizes its slave address, it acknowledges

and is then ready for continued communication.

Bus Timeout

The MAX7360 features a 20ms minimum bus timeout

on the 2-wire serial interface, largely to prevent the

MAX7360 from holding the SDA I/O low during a read

transaction should the SCL lock up for any reason before

a serial transaction is completed. Bus timeout operates

by causing the MAX7360 to internally terminate a serial

Figure 7. Command Byte Received

Figure 8. Command and Single Data Byte Received

SCL

SDA

TRANSMITTER

CLOCK PULSE FOR

ACKNOWLEDGE

START

CONDITION

SDA

RECEIVER

1 2 8 9

SDA

SCL

0 1 1 A3 A2 A11

MSB

LSB

ACKR/W

S A A P0SLAVE ADDRESS COMMAND BYTE

D7 D6 D5 D4 D3 D2 D1 D0

COMMAND BYTE IS STORED ON RECEIPT OF

ACKNOWLEDGE CONDITION

ACKNOWLEDGE FROM MAX7360

R/W

S A A A P0SLAVE ADDRESS COMMAND BYTE DATA BYTE

1 BYTE

AUTOINCREMENT

COMMAND BYTE ADDRESS

D7 D6 D5 D4 D3 D2 D1 D0 D1 D0D3 D2D5 D4D7 D6

ACKNOWLEDGE FROM MAX7360

R/W

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 30 31

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Rainbow-electronics MAX7360 Manual de usuario Pagina 15

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