Rainbow-electronics MAX7313 Manual do Utilizador descarregar pdf (Página 6)

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

6 _______________________________________________________________________________________

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

I/O PIN

GND

INPUT PORT

TO INT

QSOP QFN

NAME FUNCTION

122INT/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.

12 9 GND Ground. Do not sink more than 350mA into the GND pin.

22 19 SCL I

C-Compatible Serial Clock Input

23 20 SDA I

C-Compatible Serial Data I/O

24 21 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.

1 2 3 4 5 6 7 8 9 10 11 ... 26 27

Control and Interrupt 1

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