MAX7360ETL+T Maxim Integrated Products, MAX7360ETL+T Datasheet - Page 8

• Manufacturer Part Number: MAX7360ETL+T
• Description: IC CTRLR KEY-SW I2C 40TQFN-EP
• Manufacturer: Maxim Integrated Products
• Type: Controllerr

Specifications of MAX7360ETL+T

• Input Type: Logic
• Output Type: Logic
• Interface: I²C
• Current - Supply: 50µA
• Mounting Type: Surface Mount
• Package / Case: 40-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

I
Driver/GPIOs with Integrated ESD Protection
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 pre-
sented 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).
8
2
______________________________________________________________________________________
C-Interfaced Key-Switch Controller and LED
INTK
SDA
SCL
AD0
INTI
*GPO
INTERFACE
TIMEOUT
Detailed Description
BUS
I
2
C
MAX7360
OSCILLATOR
128kHz
REGISTERS
CONTROL
FIFO
POR
ROTARY
LOGIC
SCAN
PWM
GPIO
KEY
CURRENT DETECT
COLUMN ENABLE
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.
On power-up, all control registers are set to power-up
values and the MAX7360 is in sleep mode (Table 1).
GPIO ENABLE
GPO ENABLE
ROW ENABLE
LED ENABLE
GPIO INPUT
CONSTANT-
PORT GPIO
LED DRIVE
CURRENT
CURRENT
COLUMN
SOURCE
DRIVES
DRIVES
OPEN-
DRAIN
ROW
AND
Functional Block Diagram
PORT0
PORT1
PORT2
PORT3
PORT4
PORT5
PORT6
PORT7
COL0
COL1
COL2*
COL3*
COL4*
COL5*
COL6*
COL7*
ROW0
ROW1
ROW2
ROW3
ROW4
ROW5
ROW6
ROW7
Initial Power-Up