MAX7313 データシートの表示（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 13. Master, O16 Intensity Register

REGISTER

MASTER AND GLOBAL INTENSITY

Write master and global intensity

Read back master and global intensity

Master intensity duty cycle is 0/15 (off);

internal oscillator is disabled;

all outputs will be static with no PWM

Master intensity duty cycle is 1/15

Master intensity duty cycle is 2/15

Master intensity duty cycle is 3/15

—

Master intensity duty cycle is 13/15

Master intensity duty cycle is 14/15

Master intensity duty cycle is 15/15 (full)

ADDRESS

CODE

R/W (HEX)

0

1

REGISTER DATA

D7

D6

D5

D4

MSB

LSB

MASTER INTENSITY

D3

MSB

D2

D1

O16 INTENSITY

M3

M2

M1

M0

G3

G2

G1

D0

LSB

G0

—

0

0

0

0

—

—

—

—

—

—

—

—

—

0X0E

—

—

0

0

0

1

—

—

—

—

0

0

1

0

—

—

—

—

0

0

1

1

—

—

—

—

—

—

—

—

—

—

—

—

1

1

0

1

—

—

—

—

1

1

1

0

—

—

—

—

1

1

1

1

—

—

—

—

O16 intensity duty cycle is 1/16

—

O16 intensity duty cycle is 2/16

—

O16 intensity duty cycle is 3/16

—

—

—

O16 intensity duty cycle is 14/16

—

O16 intensity duty cycle is 15/16

—

O16 intensity duty cycle is 16/16

(static output, no PWM)

—

—

—

—

—

0

0

0

0

—

—

—

—

0

0

0

1

—

—

—

—

0

0

1

0

—

—

—

—

—

—

—

—

—

—

—

—

1

1

0

1

—

—

—

—

1

1

1

0

—

—

—

—

1

1

1

1

Compatibility with MAX7311

The MAX7313 is pin compatible and software compatible

with the standard register structure used by MAX7311,

PCA9535, and PCA9555. However, some MAX7311 func-

tions are not implemented in the MAX7313, and the

MAX7313’s PWM and blink functionality is not supported

in the MAX7311. Software compatibility is clearly not

100%, but the MAX7313 was designed so the subset

(omitted) features default to the same power-up behavior

as the MAX7311, PCA9535, and PCA9555, and superset

features do not use existing registers in a different way. In

practice, many applications can use the MAX7313 as a

drop-in replacement for the MAX7311.

Driving LED Loads

When driving LEDs, a resistor in series with the LED

must be used to limit the LED current to no more than

50mA. Choose the resistor value according to the fol-

lowing formula:

RLED = (VSUPPLY - VLED - VOL) / ILED

where:

RLED is the resistance of the resistor in series with the

LED (Ω).

VSUPPLY is the supply voltage used to drive the LED (V).

VLED is the forward voltage of the LED (V).

VOL is the output low voltage of the MAX7313 when

sinking ILED (V).

ILED is the desired operating current of the LED (A).

For example, to operate a 2.2V red LED at 14mA from a

5V supply, RLED = (5 - 2.2 - 0.25) / 0.014 = 182Ω.

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