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MAX7360ETL

I2C-Interfaced Key-Switch Controller and LED Driver/GPIOs with Integrated ESD Protection

Maxim Integrated 

I2C-Interfaced Key-Switch Controller and LED

Driver/GPIOs with Integrated ESD Protection

Functional Block Diagram

MAX7360

INTI

INTK

SDA

SCL

I2C

AD0

INTERFACE

BUS

TIMEOUT

*GPO

128kHz

OSCILLATOR

CONTROL

REGISTERS

FIFO

POR

PWM

GPIO

LOGIC

LED ENABLE

GPIO ENABLE

GPIO INPUT

PORT GPIO

AND

CONSTANT-

CURRENT

LED DRIVE

ROTARY

COLUMN ENABLE

GPO ENABLE

CURRENT DETECT

CURRENT

SOURCE

COLUMN

DRIVES

KEY

SCAN

ROW ENABLE

OPEN-

DRAIN

ROW

DRIVES

PORT0

PORT1

PORT2

PORT3

PORT4

PORT5

PORT6

PORT7

COL0

COL1

COL2*

COL3*

COL4*

COL5*

COL6*

COL7*

ROW0

ROW1

ROW2

ROW3

ROW4

ROW5

ROW6

ROW7

Detailed Description

The MAX7360 is a microprocessor peripheral low-noise

key-switch controller that monitors up to 64 key switches

with optional autorepeat, and key events that are

presented in a 16-byte FIFO. The MAX7360 also features

eight open-drain GPIOs configured for digital I/O or

constant-current output for LED applications up to +14V.

The MAX7360 features an automatic sleep mode and

automatic wakeup that further reduce supply current

consumption. The MAX7360 can be configured to enter

sleep mode after a programmable time following a key

event. The FIFO content is maintained and can be read

in sleep mode. The MAX7360 does not enter autosleep

when a key is held down. The autowake feature takes

the MAX7360 out of sleep mode following a keypress

event. Enable/disable autosleep and autowake through

the configuration register (Table 8).

To prevent overloading the microprocessor with too

many interrupts, interrupt requests are issued on a

programmable number of FIFO entries, and/or after a

set period of time (Table 10). The key-switch status is

checked by reading the key-switch FIFO. A 1-byte read

access returns both the next key event in the FIFO (if

there is one) and the FIFO status. INTK functions as an

open-drain general-purpose output (GPO) capable of

driving an LED if key-switch interrupts are not required.

Up to six of the key-switch outputs function as open-

drain GPOs capable of driving additional LEDs when

the application requires fewer keys to be scanned. For

each key-switch output used as a GPO, the number of

monitored key switches reduces by eight.

Initial Power-Up

On power-up, all control registers are set to power-up

values and the MAX7360 is in sleep mode (Table 1).

8   _______________________________________________________________________________________

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