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Maxim Integrated 11-2

MAX31782 User’s Guide

Revision 0; 8/11

SECTION 11: GENERAL-PURPOSE INPUT/OUTPUT (GPIO) PINS

The MAX31782 provides general-purpose input/output (GPIO) functionality on 21 pins. In addition to the GPIO function-

ality, each of these pins is multiplexed with at least one other function, which is classified as either a special function

or alternate function.

Special functions override the GPIO register settings of the port pin when they are enabled. Once the special function

takes control, normal control of the port pin is lost until the special function is disabled.

Alternate functions operate in parallel with the GPIO register settings for the port pin, and generally consist of input-only

functions. When an alternate function is enabled for a port pin, the port pin’s output state can still be controlled by the

GPIO register settings, or driven by external hardware.

Table 11-1 details all the GPIO pins as well as what other functions are multiplexed with each pin. With the exception

of a few pins, which are described in further detail later, the GPIO pins operate as shown in the GPIO block diagram

(Figure 11-1

). Some of the features of these GPIO pins include the following:

• CMOS output drivers

• Schmitt trigger inputs

• Optional weak pullup to V

when operating in input mode

Figure 11-1. GPIO Pin Block Diagram

PDp.n

SF = SPECIAL FUNCTION

AF = ALTERNATE FUNCTION

THE FORMAT FOR GPIO CONTROL BITS SHOWN IS PDp.n, WHERE

p DESIGNATES THE PORT (p = 1, 2, 6)

n IS THE PORT PIN (n = 0 TO 7)

SF ENABLE

POp.x

PIp.n , SF INPUT, OR AF INPUT

SF OUTPUT

SF DIRECTION

I/O PAD

MUXMUX

MAX31782

WEAK*

*THE pMOS AND WEAK PULLUP TRANSISTORS ARE NOT CONNECTED

TO THE SCL, SDA, MSCL, AND MSDA PINS.

EIF6.m

INTERRUPTS ONLY FOR PORT6

EIE6.m

EIES6.m

DETECT

CIRCUIT

MAX31782

1 2 ... 91 92 93 94 95 96 97 98 99 100 101 ... 222 223

MAX31782 User’s Guide 1

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