MAX7318 Ver la hoja de datos (PDF) - Maxim Integrated

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MAX7318

2-Wire-Interfaced, 16-Bit, I/O Port Expander with Interrupt and Hot-Insertion Protection

Maxim Integrated 

2-Wire-Interfaced, 16-Bit, I/O Port Expander

with Interrupt and Hot-Insertion Protection

Table 2. Registers 0x00, 0x01—Input Port Registers

I7

I6

I5

I4

I3

I2

I1

I0

BIT

I15

I14

I13

I12

I11

I10

I9

I8

Table 3. Registers 0x02, 0x03—Output Port Registers

O7

O6

O5

O4

O3

O2

O1

O0

BIT

O15

O14

O13

O12

O11

O10

O9

O8

Power-up default

1

1

1

1

1

1

1

1

Table 4. Registers 0x04, 0x05—Polarity Inversion Registers

I/O7

I/O6

I/O5

I/O4

I/O3

I/O2

I/O1

I/O0

BIT

I/O15

I/O14

I/O13

I/O12

I/O11

I/O10

I/O9

I/O8

Power-up default

0

0

0

0

0

0

0

0

Table 5. Registers 0x06, 0x07—Configuration Registers

I/O7

I/O6

I/O5

I/O4

I/O3

I/O2

I/O1

I/O0

BIT

I/O15

I/O14

I/O13

I/O12

I/O11

I/O10

I/O9

I/O8

Power-up default

1

1

1

1

1

1

1

1

Output Port Registers

The output port registers (Table 3) set the outgoing

logic levels of the I/Os defined as outputs by the

respective configuration register. Reads from the output

port registers reflect the value that is in the flip-flop con-

trolling the output selection, not the actual I/O value.

Polarity Inversion Registers

The polarity inversion registers (Table 4) enable polarity

inversion of pins defined as inputs by the respective

port configuration registers. Set the bit in the polarity

inversion register to invert the corresponding port pin’s

polarity. Clear the bit in the polarity inversion register to

retain the corresponding port pin’s original polarity.

Configuration Registers

The configuration registers (Table 5) configure the

directions of the I/O pins. Set the bit in the respective

configuration register to enable the corresponding port

as an input. Clear the bit in the configuration register to

enable the corresponding port as an output.

Standby

The MAX7318 goes into standby when the I2C bus is

idle. Standby supply current is typically 5.4µA.

Applications Information

Hot Insertion

The I/O ports I/O0–I/O15, interrupt output INT, and serial

interface SDA, SCL, AD0–2 remain high impedance with

up to 6V asserted on them when the MAX7318 is pow-

ered down (V+ = 0V). The MAX7318 can therefore be

used in hot-swap applications. Note that each I/O’s

100kΩ pullup effectively becomes a 100kΩ pulldown

when the MAX7318 is powered down.

Power-Supply Consideration

The MAX7318 operates from a supply voltage of 2V to

5.5V. Bypass the power supply to GND with a 0.047µF

capacitor as close to the device as possible. For the

QFN version, connect the exposed pad to GND.

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