MAX7316 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX7316

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

Maxim Integrated 

10-Port I/O Expander with LED Intensity

Control, Interrupt, and Hot-Insertion Protection

Table 3. Power-Up Configuration

REGISTER FUNCTION

POWER-UP CONDITION

Blink phase 0 outputs P7–P0

Ports configuration P7–P0

Blink phase 1 outputs P7–P0

Master, O8 intensity

Configuration

Outputs intensity P1, P0

Outputs Intensity P3, P2

Outputs intensity P5, P4

Outputs intensity P7, P6

High-impedance outputs

Ports P7–P0 are inputs

High-impedance outputs

PWM oscillator is disabled;

O8 is static logic output

INT/O8 is interrupt output;

blink is disabled;

global intensity is enabled

P1, P0 are static logic outputs

P3, P2 are static logic outputs

P5, P4 are static logic outputs

P7, P6 are static logic outputs

ADDRESS

CODE

REGISTER DATA

(HEX)

D7 D6 D5 D4 D3 D2 D1 D0

0x01

11111111

0x03

11111111

0x09

11111111

0x0E

00001111

0x0F

0x10

0x11

0x12

0x13

00001100

11111111

11111111

11111111

11111111

INT/O8 Output

The INT/O8 output pin can be configured as either the

INT output that reflects the interrupt flag logic state or as

a general-purpose output O8. When used as a general-

purpose output, INT/O8 has the same blink and PWM

intensity control capabilities as the other ports.

Set the interrupt enable I bit in the configuration register

to configure INT/O8 as the INT output (Table 4). Clear

interrupt enable to configure INT/O8 as the O8. The O8

logic state is set by the 2 bits O1 and O0 in the configu-

ration register. O8 follows the rules for blinking selected

by the blink enable flag E in the configuration register. If

blinking is disabled, then interrupt output control O0

alone sets the logic state of the INT/O8 pin. If blinking is

enabled, then both interrupt output controls O0 and O1

set the logic state of INT/O8 according to the blink

phase. PWM intensity control for O8 is set by the 4

global intensity bits in the master and O8 intensity reg-

ister (Table 13).

Blink Mode

In blink mode, the output ports can be flipped between

using either the blink phase 0 register or the blink

phase 1 register. Flip control is both hardware (the

BLINK input) and software control (the blink flip flag B

in the configuration register) (Table 4).

The blink function can be used for LED effects by pro-

gramming different display patterns in the two sets of

output port registers, and using the software or hard-

ware controls to flip between the patterns.

If the blink phase 1 register is written with 0xFF, then

the BLINK input can be used as a hardware disable to,

for example, instantly turn off an LED pattern pro-

grammed into the blink phase 0 register. This technique

can be further extended by driving the BLINK input with

a PWM signal to modulate the LED current to provide

fading effects.

The blink mode is enabled by setting the blink enable flag

E in the configuration register (Table 4). When blink mode

is enabled, the states of the blink flip flag and the BLINK

input are EXOR’ed to set the phase, and the output ports

are set by either the blink phase 0 register or the blink

phase 1 register (Figure 11) (Table 7).

12 ______________________________________________________________________________________

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