MAX7310 Ver la hoja de datos (PDF) - Maxim Integrated

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MAX7310

2-Wire-Interfaced 8-Bit I/O Port Expander with Reset

Maxim Integrated 

2-Wire-Interfaced 8-Bit I/O Port Expander

with Reset

SDA

Figure 4. Bit Transfer

SCL

DATA LINE STABLE; DATA VALID CHANGE OF DATA ALLOWED

START CONDITION

SCL

1

2

CLOCK PULSE FOR ACKNOWLEDGMENT

8

9

SDA

BY TRANSMITTER

S

SDA

BY RECEIVER

Figure 5. Acknowledge

FIXED

PROGRAMMABLE

SDA

0

A5

A4

A3

A2

A1

A0

R/W

ACK

MSB

LSB

SCL

Figure 6. Slave Address

The first bits (MSBs) of the MAX7310 slave address are

always zero. Slave address bits AD2, AD1, and AD0

choose 1 of 56 slave ID addresses (Table 7).

Registers

The register address byte is the first byte to follow the

address byte during a read/write transmission. The reg-

ister address byte acts as a pointer to determine which

register is written or read.

The input port register is a read-only port. It reflects the

incoming logic levels of the I/O ports, regardless of

whether the pin is defined as an input or an output by

the configuration register. Writes to the input port regis-

ter are ignored.

_______________________________________________________________________________________ 7

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