MAX7313 Ver la hoja de datos (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

Table 5. Ports Configuration Registers

REGISTER

ADDRESS

R/W CODE

REGISTER DATA

(HEX)

D7

D6

D5

D4

D3

D2

D1

D0

Ports configuration P7–P0

(1 = input, 0 = output)

0

0x06

OP7 OP6 OP5 OP4 OP3 OP2 OP1 OP0

Read back ports configuration P7–P0

1

Ports configuration P15–P8

(1 = input, 0 = output)

0

0x07 OP15 OP14 OP13 OP12 OP11 OP10 OP9 OP8

Read back ports configuration P15–P8 1

Table 6. Input Ports Registers

REGISTER

Read input ports P7–P0

Read input ports P15–P8

ADDRESS

R/W CODE

REGISTER DATA

(HEX)

D7

D6

D5

D4

D3

D2

D1

D0

1

0x00

IP7 IP6 IP5 IP4 IP3 IP2 IP1 IP0

1

0x01

IP15 IP14 IP13 IP12 IP11 IP10 IP9 IP8

If blinking is enabled, then both interrupt output con-

trols O0 and O1 set the logic state of the INT/O16 pin

according to the blink phase. PWM intensity control for

O16 is set by the 4 global intensity bits in the master

and O16 intensity register (Table 13).

The blink mode is disabled by clearing the blink enable

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

mode is disabled, the state of the blink flip flag is

ignored, and the blink phase 0 registers alone control

the output ports.

Blink Mode

In blink mode, the output ports can be flipped between

using either the blink phase 0 registers or the blink phase

1 registers. Flip control is by software control (the blink

flip flag B in the configuration register) (Table 4). If hard-

ware flip control is needed, consider the MAX7314, which

includes a BLINK input, as well as software control.

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 registers are 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 registers. This tech-

nique 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 state of the blink flip flag sets the

phase, and the output ports are set by either the blink

phase 0 registers or the blink phase 1 registers (Table 7).

Blink Phase Registers

When the blink function is disabled, the two blink phase

0 registers set the logic levels of the 16 ports (P0 through

P15) when configured as outputs (Table 8). A duplicate

pair of registers called the blink phase 1 registers are

also used if the blink function is enabled (Table 9). A

logic high sets the appropriate output port high imped-

ance, while a logic low makes the port go low.

Reading a blink phase register reads the value stored

in the register, not the actual port condition. The port

output itself may or may not be at a valid logic level,

depending on the external load connected.

Table 7. Blink Controls

BLINK

ENABLE

FLAG E

0

BLINK

FLIP

FLAG B

X

0

1

1

X = Don’t care.

BLINK

FUNCTION

Disabled

Enabled

OUTPUT

REGISTERS

USED

Blink phase 0

registers

Blink phase 0

registers

Blink phase 1

registers

16 ______________________________________________________________________________________

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