MAX7315 Просмотр технического описания (PDF) - Maxim Integrated

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MAX7315

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

Maxim Integrated 

8-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

R/W ACKNOWLEDGE FROM SLAVE

ACKNOWLEDGE FROM SLAVE

ACKNOWLEDGE FROM SLAVE

DATA1 VALID

tDV

tDV

STOP

CONDITION

DATA2 VALID

READ FROM INPUT PORTS REGISTERS

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

DATA1

LSB A MSB

DATA4

LSB NA P

START CONDITION

P7–P0

DATA1

R/W ACKNOWLEDGE FROM SLAVE

DATA2

tDH

DATA3

ACKNOWLEDGE FROM MASTER

DATA4

tDS

STOP CONDITION

NO ACKNOWLEDGE FROM

MASTER

INTERRUPT VALID/RESET

SCL 1 2 3 4 5 6 7 8 9

SLAVE ADDRESS

COMMAND BYTE

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

DATA2

LSB A MSB

DATA4

LSB NA P

START CONDITION

P7–P0

DATA1

R/W ACKNOWLEDGE FROM SLAVE

DATA2

ACKNOWLEDGE FROM MASTER

DATA3

STOP CONDITION

NO ACKNOWLEDGE FROM

MASTER

INT

tIV

tIR tIV

tIR

Figure 10. Read, Write, and Interrupt Timing Diagrams

Command Address Autoincrementing

The command address stored in the MAX7315 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

MAX7316. The MAX7316 includes a RST input, which

clears any transaction to or from the MAX7316 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

MAX7315 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/O8 output, and read back the interrupt status

(Table 4).

12 ______________________________________________________________________________________

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