Max7313, Functional overview, Pin description – Rainbow Electronics MAX7313 User Manual

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MAX7313

Functional Overview

The MAX7313 is a general-purpose input/output (GPIO)
peripheral that provides 16 I/O ports, P0–P15, con-
trolled through an I

C-compatible serial interface. A

17th output-only port, INT/O16, can be configured as
an interrupt output or as a general-purpose output port.
All output ports sink loads up to 50mA connected to
external supplies up to 5.5V, independent of the

MAX7313’s supply voltage. The MAX7313 is rated for a
ground current of 350mA, allowing all 17 outputs to sink
20mA at the same time. Figure 1 shows the output
structure of the MAX7313. The ports default to inputs on
power-up.

Port Inputs and Transition Detection

Input ports registers reflect the incoming logic levels of
the port pins, regardless of whether the pin is defined

16-Port I/O Expander with LED Intensity
Control and Interrupt

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Pin Description

Figure 1. Simplified Schematic of I/O Ports

DATA FROM

SHIFT REGISTER

DATA FROM

SHIFT REGISTER

WRITE

CONFIGURATION

PULSE

WRITE PULSE

READ PULSE

CONFIGURATION

INPUT PORT

OUTPUT

PORT

OUTPUT PORT
REGISTER DATA

I/O PIN

GND

INPUT PORT
REGISTER DATA

TO INT

PIN

QSOP

QFN

NAME

FUNCTION

INT/O16

Output Port. Open-drain output rated at 7V, 50mA. Configurable as interrupt
output or general-purpose output.

21, 2, 3

18, 23, 24

AD0, AD1,

AD2

Address Inputs. Sets device slave address. Connect to either GND, V+,
SCL, or SDA to give 64 logic combinations. See Table 1.

4–11, 13–20

1–8, 10–17

P0–P15

Input/Output Ports. P0–P15 are open-drain I/Os rated at 5.5V, 50mA.

GND

Ground. Do not sink more than 350mA into the GND pin.

SCL

C-Compatible Serial Clock Input

SDA

C-Compatible Serial Data I/O

V+

Positive Supply Voltage. Bypass V+ to GND with a 0.047µF ceramic
capacitor.

—

PAD

EXPOSED PAD

Exposed pad on package underside. Connect to GND.