MAX7313 データシートの表示（PDF） - Maxim Integrated

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MAX7313

16-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection

Maxim Integrated 

16-Port I/O Expander with LED Intensity

Control, Interrupt, and Hot-Insertion Protection

WRITE TO OUTPUT PORTS REGISTERS (BLINK PHASE 0 REGISTERS/BLINK PHASE 1 REGISTERS)

SCL 1 2 3 4 5 6 7 8 9

SLAVE ADDRESS

COMMAND BYTE

SDA S A6 A5 A4 A3 A2 A1 A0 0 A 0 0 0 0 0 0 0 1 A MSB

DATA1

LSB A MSB

DATA2

LSB A P

START CONDITION

P7–P0

P15– P8

R/W ACKNOWLEDGE FROM SLAVE

ACKNOWLEDGE FROM SLAVE

ACKNOWLEDGE FROM SLAVE

DATA1 VALID

tDV

tDV

READ FROM INPUT PORTS REGISTERS

SCL

12345678

SLAVE ADDRESS

SDA S A6 A5 A4 A3 A2 A1 A0 1

9

COMMAND BYTE

A MSB

DATA1

START CONDITION

R/W ACKNOWLEDGE FROM SLAVE

P7–P0

P15–P8

DATA1

DATA5

DATA2

tDH

DATA3

LSB A MSB

DATA6

LSB NA P

ACKNOWLEDGE FROM MASTER

DATA4

STOP CONDITION

NO ACKNOWLEDGE FROM

MASTER

DATA6

tDS

INTERRUPT VALID/RESET

SCL 1 2 3 4 5 6 7 8

SLAVE ADDRESS

SDA S A6 A5 A4 A3 A2 A1 A0 1

9

COMMAND BYTE

A MSB

DATA2

LSB A MSB

DATA4

LSB NA P

START CONDITION

P7–P0

P15–P8

DATA1

R/W ACKNOWLEDGE FROM SLAVE

DATA3

DATA2

ACKNOWLEDGE FROM MASTER

DATA4

STOP CONDITION

NO ACKNOWLEDGE FROM

MASTER

INT

tIV

tIR tIV

tIR

STOP

CONDITION

DATA2 VALID

Figure 10. Read, Write, and Interrupt Timing Diagrams

Command Address Autoincrementing

The command address stored in the MAX7313 circu-

lates around grouped register functions after each data

byte is written or read (Table 2).

Device Reset

If a device reset input is needed, consider the

MAX7314. The MAX7314 includes a RST input, which

clears any transaction to or from the MAX7314 on the

serial interface and configures the internal registers to

the same state as a power-up reset.

Detailed Description

Initial Power-Up

On power-up all control registers are reset and the

MAX7313 enters standby mode (Table 3). Power-up

status makes all ports into inputs and disables both the

PWM oscillator and blink functionality.

Configuration Register

The configuration register is used to configure the PWM

intensity mode, interrupt, and blink behavior, operate

the INT/O16 output, and read back the interrupt status

(Table 4).

12 ______________________________________________________________________________________

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