MAX7370 Maxim, MAX7370 Datasheet - Page 7

• Manufacturer Part Number: MAX7370
• Description: The MAX7370 I²C-interfaced peripheral provides microprocessors with management of up to 64 key switches, with optional GPIO and PWM-controlled LED drivers
• Manufacturer: Maxim

with I
TQFN
13
14
15
16
17
18
19
20
21
22
24
—
SDA
SCL
AD0
INT
8 x 8 Key-Switch Controller and LED Driver/GPIOs
PIN
BUS TIMEOUT
WLP
INTERFACE
D4
D3
D2
D1
C2
C1
A1
E4
E3
E2
E1
—
2
I
2
C
C Interface and High Level of ESD Protection
MAX7370
����������������������������������������������������������������� Maxim Integrated Products 7
NAME
ROW0
ROW1
ROW2
ROW3
ROW4
AD0
SDA
SCL
V
V
INT
EP
CC
LA
Second Logic Level for GPIO Level Shifting (where V
Address Input. Selects up to four device slave addresses (Table 3).
I
I
Active-Low Key-Switch Interrupt Output. INT is open-drain and requires a pullup resistor.
Positive Supply Voltage. Bypass to GND with a 0.1FF capacitor as close as possible to the device.
Row 0 Input from Key Matrix or GPIO Port
Row 1 Input from Key Matrix or GPIO Port
Row 2 Input from Key Matrix or GPIO Port
Row 3 Input from Key Matrix or GPIO Port
Row 4 Input from Key Matrix or GPIO Port
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.
2
2
OSCILLATOR
C-Compatible, Serial-Data I/O
C-Compatible, Serial-Clock Input
REGISTERS FIFO
128kHz
CONTROL
POR
KEY-SCAN
LOGIC
LOGIC
PWM
GPIO
I/O SUPPLY CONTROL
COLUMN ENABLE
CURRENT DETECT
PWM SIGNAL
LED ENABLE
GPIO ENABLE
ROW DETECT
GPIO ENABLE
ROW ENABLE
GPIO INPUT
GPIO INPUT
FUNCTION
Pin Description (continued)
Functional Block Diagram
CC
LED DRIVERS
PULL GPIO/
PULL GPIO
CURRENT
COLUMN
SOURCE
DRIVES/
DRIVES/
PUSH-
PUSH-
ROW
P V
V
CC
LA
P 3.6V)
V
LA
COL0
COL1
COL2
COL3
COL4
COL5
COL6
COL7
ROW0
ROW1
ROW2
ROW3
ROW4
ROW5
ROW6
ROW7
MAX7370