Datasheet

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MAX7315

8-Port I/O Expander with LED Intensity

Control, Interrupt, and Hot-Insertion Protection

14 ______________________________________________________________________________________

Table 3. Power-Up Configuration

REGISTER DATA

REGISTER FUNCTION POWER-UP CONDITION

ADDRESS

CODE

(HEX)

D7

D6

D5

D4

D3

D2

D1

D0

Blink phase 0 outputs P7–P0

High-impedance outputs 0x01

1

1

1

1

1

1

1

1

Ports configuration P7–P0 Ports P7–P0 are inputs 0x03

1

1

1

1

1

1

1

1

Blink phase 1 outputs P7–P0

High-impedance outputs 0x09

1

1

1

1

1

1

1

1

Master, O8 intensity

PWM oscillator is disabled;

O8 is static logic output

0x0E

0

0

0

0

1

1

1

1

Configuration

INT/O8 is interrupt output;

blink is disabled;

global intensity is enabled

0x0F

0

0

0

0

1

1

0

0

Outputs intensity P1, P0

P1, P0 are static logic outputs

0x10

1

1

1

1

1

1

1

1

Outputs Intensity P3, P2

P3, P2 are static logic outputs

0x11

1

1

1

1

1

1

1

1

Outputs intensity P5, P4

P5, P4 are static logic outputs

0x12

1

1

1

1

1

1

1

1

Outputs intensity P7, P6

P7, P6 are static logic outputs

0x13

1

1

1

1

1

1

1

1

Table 4. Configuration Register

REGISTER DATA

REGISTER

ADDRESS

CODE

(HEX)

D7 D6 D5 D4 D3 D2 D1 D0

CONFIGURATION

R/W

INTERRUPT

STATUS

—

INTERRUPT

OUTPUT

CONTROL

AS GPO

INTERRUPT

ENABLE

GLOBAL

INTENSITY

BLINK FLIP

BLINK

ENABLE

Write device configuration

0

X

Read-back device configuration

1

INT

O

O1

O0 I G B E

Disable blink

—

XXXXXXX0

Enable blink

—

XXXXXXX1

—

XXXXXX01

Flip blink register (see text)

—

XXXXXX11

Disable global intensity control—intensity

is set by registers 0x10–0x13 for ports P0

through P7 when configured as outputs,

and by D3–D7 of register 0x0E for INT/O8

when INT/O8 pin is configured as an

output port

—

XXXXX0 XX

Enable global intensity control—intensity

for all ports configured as outputs is set

by D3–D0 of register 0x0E

—

0x0F

XXXXX1 XX

X = Don’t care.