Datasheet

MAX7370
8 x 8 Key-Switch Controller and LED Driver/GPIOs
with I2C Interface and High Level of ESD Protection
7Maxim Integrated
Pin Description (continued)
Functional Block Diagram
PIN
NAME FUNCTION
TQFN WLP
13 D4 V
LA
Second Logic Level for GPIO Level Shifting (where V
CC
P V
LA
P 3.6V)
14 E4 AD0 Address Input. Selects up to four device slave addresses (Table 3).
15 D3 SDA I
2
C-Compatible, Serial-Data I/O
16 E3 SCL I
2
C-Compatible, Serial-Clock Input
17 E2
INT Active-Low Key-Switch Interrupt Output. INT is open-drain and requires a pullup resistor.
18 D2 V
CC
Positive Supply Voltage. Bypass to GND with a 0.1FF capacitor as close as possible to the device.
19 E1 ROW0 Row 0 Input from Key Matrix or GPIO Port
20 D1 ROW1 Row 1 Input from Key Matrix or GPIO Port
21 C2 ROW2 Row 2 Input from Key Matrix or GPIO Port
22 C1 ROW3 Row 3 Input from Key Matrix or GPIO Port
24 A1 ROW4 Row 4 Input from Key Matrix or GPIO Port
— — EP
Exposed Pad (TQFN Only). Internally connected to GND. Connect to a large ground plane to
maximize thermal performance. Not intended as an electrical connection point.
INT
128kHz
OSCILLATOR
CONTROL
REGISTERS FIFO
BUS TIMEOUT POR
KEY-SCAN
LOGIC
ROW
DRIVES/
PUSH-
PULL GPIO
PWM
GPIO
LOGIC
ROW0
ROW1
ROW2
ROW3
ROW4
ROW5
ROW6
ROW7
COL1
COL2
COL3
COL4
COL5
COL6
COL7
LED ENABLE
I/O SUPPLY CONTROL
I
2
C
INTERFACE
PWM SIGNAL
V
LA
V
CC
AD0
SCL
SDA
CURRENT
SOURCE
COLUMN
DRIVES/
PUSH-
PULL GPIO/
LED DRIVERS
COLUMN ENABLE
GPIO ENABLE
ROW DETECT
GPIO ENABLE
CURRENT DETECT
GPIO INPUT
ROW ENABLE
GPIO INPUT
COL0
MAX7370