MAX7313 Maxim, MAX7313 Datasheet - Page 21

• Manufacturer Part Number: MAX7313
• Description: The MAX7313 I²C-compatible serial interfaced peripheral provides microprocessors with 16 I/O ports
• Manufacturer: Maxim

Table 13. Master, O16 Intensity Register
The MAX7313 is pin compatible and software compatible
with the standard register structure used by MAX7311,
PCA9535, and PCA9555. However, some MAX7311 func-
tions are not implemented in the MAX7313, and the
MAX7313’s PWM and blink functionality is not supported
in the MAX7311. Software compatibility is clearly not
100%, but the MAX7313 was designed so the subset
(omitted) features default to the same power-up behavior
as the MAX7311, PCA9535, and PCA9555, and superset
features do not use existing registers in a different way. In
practice, many applications can use the MAX7313 as a
drop-in replacement for the MAX7311.
When driving LEDs, a resistor in series with the LED
must be used to limit the LED current to no more than
______________________________________________________________________________________________________
Control, Interrupt, and Hot-Insertion Protection
Master intensity duty cycle is 15/15 (full)
Master intensity duty cycle is 0/15 (off);
Read back master and global intensity
MASTER AND GLOBAL INTENSITY
all outputs will be static with no PWM
Master intensity duty cycle is 13/15
Master intensity duty cycle is 14/15
Master intensity duty cycle is 1/15
Master intensity duty cycle is 2/15
Master intensity duty cycle is 3/15
Write master and global intensity
O16 intensity duty cycle is 14/16
O16 intensity duty cycle is 15/16
O16 intensity duty cycle is 16/16
internal oscillator is disabled;
O16 intensity duty cycle is 1/16
O16 intensity duty cycle is 2/16
O16 intensity duty cycle is 3/16
(static output, no PWM)
REGISTER
—
—
Compatibility with MAX7311
16-Port I/O Expander with LED Intensity
Driving LED Loads
R/W
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
0
1
ADDRESS
CODE
(HEX)
0X0E
MSB
M3
D7
—
—
—
—
—
—
—
—
0
0
0
0
1
1
1
50mA. Choose the resistor value according to the fol-
lowing formula:
where:
R
LED (Ω).
V
V
V
sinking I
I
For example, to operate a 2.2V red LED at 14mA from a
5V supply, R
MASTER INTENSITY
LED
SUPPLY
LED
OL
LED
M2
is the desired operating current of the LED (A).
D6
is the output low voltage of the MAX7313 when
—
—
—
—
—
—
—
—
0
0
0
0
1
1
1
is the forward voltage of the LED (V).
is the resistance of the resistor in series with the
LED
R
is the supply voltage used to drive the LED (V).
LED
M1
D5
(V).
LED
—
—
—
—
—
—
—
—
0
0
1
1
0
1
1
= (V
= (5 - 2.2 - 0.25) / 0.014 = 182Ω.
REGISTER DATA
SUPPLY
LSB
M0
D4
—
—
—
—
—
—
—
—
0
1
0
1
1
0
1
MSB
- V
D3
G3
—
—
—
—
—
—
—
—
—
0
0
0
1
1
1
LED
O16 INTENSITY
- V
D2
G2
—
—
—
—
—
—
—
—
—
0
0
0
1
1
1
OL
) / I
LED
D1
G1
—
—
—
—
—
—
—
—
—
0
0
1
0
1
1
LSB
D0
G0
—
—
—
—
—
—
—
—
—
0
1
0
1
0
1
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