Datasheet

MAX7370
8 x 8 Key-Switch Controller and LED Driver/GPIOs
with I2C Interface and High Level of ESD Protection
31Maxim Integrated
Table 26. LED Constant-Current Setting Register (0x43)
Table 27. Common PWM Register (0x45)
Table 28. I
2
C Timeout Flag Register (0x48) (Read Only)
REGISTER BIT DESCRIPTION VALUE FUNCTION DEFAULT VALUE
D[7:6] Reserved 11 Set always as 11 11
D[5:1] Reserved 00000 — 00000
D0
Constant-current
setting
0 Constant current is 20mA
0
1 Constant current is 10mA
REGISTER DESCRIPTION
REGISTER DATA
D7 D6 D5 D4 D3 D2 D1 D0
COMMON PWM
Power-up default setting
Common PWM ratio is 0/256
0 0 0 0 0 0 0 0
Common PWM ratio is 1/256 0 0 0 0 0 0 0 1
Common PWM ratio is 2/256 0 0 0 0 0 0 1 0
Common PWM ratio is 3/256 0 0 0 0 0 0 1 1
⋮
Common PWM ratio is 252/256 1 1 1 1 1 1 0 0
Common PWM ratio is 253/256 1 1 1 1 1 1 0 1
Common PWM ratio is 254/256 1 1 1 1 1 1 1 0
Common PWM ratio is 256/256 (100% duty cycle) 1 1 1 1 1 1 1 1
REGISTER BIT DESCRIPTION VALUE FUNCTION DEFAULT VALUE
D[7:1] Reserved 0000000 — 0000000
D0 I
2
C timeout flag
0
No I
2
C timeout has occurred since last read or
POR.
0
1
I
2
C timeout has occurred since last read or POR.
This bit is reset to zero when a read is performed
on this register. I
2
C timeouts must be enabled for
this function to work (see Table 8).