MAX7314 데이터 시트보기 (PDF) - Maxim Integrated

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MAX7314

18-Port GPIO with LED Intensity Control, Interrupt, and Hot-Insertion Protection

Maxim Integrated 

18-Port GPIO with LED Intensity Control,

Interrupt, and Hot-Insertion Protection

Table 3. Power-Up Configuration

REGISTER FUNCTION

Blink phase 0 outputs P7–P0

Blink phase 0 outputs P15–P8

Ports configuration P7–P0

Ports configuration P15–P8

Blink phase 1 outputs P7–P0

Blink phase 1 outputs P15–P8

Master, O16 intensity

POWER-UP CONDITION

High-impedance outputs

High-impedance outputs

Ports P7–P0 are inputs

Ports P15–P8 are inputs

High-impedance outputs

High-impedance outputs

PWM oscillator is disabled;

O16 is static logic output

ADDRESS

CODE

REGISTER DATA

(hex)

D7 D6 D5 D4 D3 D2 D1 D0

0x02

11111111

0x03

11111111

0x06

11111111

0x07

11111111

0x0A

11111111

0x0B

11111111

0x0E

00001111

Configuration

INT/O16 is interrupt output;

blink is disabled;

global intensity is enabled

0x0F

00001100

Outputs intensity P1, P0

Outputs Intensity P3, P2

Outputs intensity P5, P4

Outputs intensity P7, P6

Outputs intensity P9, P8

Outputs intensity P11, P10

Outputs intensity P13, P12

Outputs intensity P15, P14

P1, P0 are static logic outputs

P3, P2 are static logic outputs

P5, P4 are static logic outputs

P7, P6 are static logic outputs

P9, P8 are static logic outputs

P11, P10 are static logic outputs

P13, P12 are static logic outputs

P15, P14 are static logic outputs

0x10

0x11

0x12

0x13

0x14

0x15

0x16

0x17

11111111

11111111

11111111

11111111

11111111

11111111

11111111

11111111

Transition Detection

All ports configured as inputs are always monitored for

changes in their logic status. The action of reading an

input ports register or writing to the configuration regis-

ter samples the corresponding 8 port bits’ input condi-

tion (Tables 4, 6). This sample is continuously

compared with the actual input conditions. A detected

change in input condition causes an interrupt condition.

The interrupt is cleared either automatically if the

changed input returns to its original state, or when the

appropriate input ports register is read, updating the

compared data (Figure 10). Randomly changing a port

from an output to an input may cause a false interrupt

to occur if the state of the input does not match the

content of the appropriate input ports register. The

interrupt status is available as the interrupt flag INT in

the configuration register (Table 4).

The input status of all ports is sampled immediately

after power-up as part of the MAX7314’s internal initial-

ization, so if all the ports are pulled to valid logic levels

at that time, an interrupt does not occur at power-up.

INT/O16 Output

The INT/O16 output pin can be configured as either the

INT output that reflects the interrupt flag logic state or as

a general-purpose output O16. When used as a general-

purpose output, the INT/O16 pin 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/O16 as the INT output (Table 4). Clear

interrupt enable to configure INT/O16 as the O16. The

O16 logic state is set by the 2 bits O1 and O0 in the

configuration register. O16 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/O16 pin.

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).

12 ______________________________________________________________________________________

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