Datasheet

MAX7370
8 x 8 Key-Switch Controller and LED Driver/GPIOs
with I2C Interface and High Level of ESD Protection
9Maxim Integrated
Table 1. Register Address Map and Power-Up Conditions (continued)
ADDRESS
CODE (hex)
READ/WRITE
POWER-UP
VALUE (hex)
REGISTER
FUNCTION
DESCRIPTION
0x38
R/W
0x00
GPIO supply
voltage 1
GPIO voltages supplied by V
CC
or V
LA
for
ROW7–ROW0
0x39
R/W
0x00
GPIO supply
voltage 2
GPIO voltages supplied by V
CC
or V
LA
for
COL7–COL0
0x3A
R/W
0xFF GPIO values 1 Debounced input or output values of ROW7–ROW0
0x3B
R/W
0xFF GPIO values 2 Debounced input or output values of COL7–COL0
0x3C
R/W
0x00
GPIO level-
shifter enable
GPIO direct level-shifter pair enable
0x40
R/W
0x00
GPIO global
configuration
GPIO global enable, GPIO reset, LED fade enable
0x42
R/W
0x00 GPIO debounce ROW7–ROW0 debounce time setting
0x43
R/W
0xC0
LED constant-
current setting
COL7–COL4 constant-current output setting
0x45
R/W
0x00 Common PWM Common PWM duty-cycle setting
0x48 Read only 0x00 I
2
C timeout flag I
2
C timeout since last POR
0x50
R/W
0x00
COL4 PWM
ratio
COL4 individual duty-cycle setting
0x51
R/W
0x00
COL5 PWM
ratio
COL5 individual duty-cycle setting
0x52
R/W
0x00
COL6 PWM
ratio
COL6 individual duty-cycle setting
0x53
R/W
0x00
COL7 PWM
ratio
COL7 individual duty-cycle setting
0x54
R/W
0x00
COL4 LED
configuration
COL4 interrupt, PWM mode control, and blink-
period settings
0x55
R/W
0x00
COL5 LED
configuration
COL5 interrupt, PWM mode control, and blink-
period settings
0x56
R/W
0x00
COL6 LED
configuration
COL6 interrupt, PWM mode control, and blink-
period settings
0x57
R/W
0x00
COL7 LED
configuration
COL7 interrupt, PWM mode control, and blink-
period settings
0x58
R/W
0xFF
Interrupt
mask 1
Interrupt mask for ROW7–ROW0
0x59
R/W
0xFF
Interrupt
mask 2
Interrupt mask for COL7–COL0
0x5A
R/W
0x00
GPI trigger
mode 1
GPI edge-triggered detection setting for
ROW7–ROW0
0x5B
R/W
0x00
GPI trigger
mode 2
GPI edge-triggered detection setting for
COL7–COL0