MAX7313 Maxim, MAX7313 Datasheet - Page 18

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

16-Port I/O Expander with LED Intensity
Control, Interrupt, and Hot-Insertion Protection
Table 10. PWM Application Scenarios
Figure 11. PWM Timing
Figure 12. Master Set to 1/15
Figure 13. Master Set to 14/15
18
All outputs static without PWM
A mix of static and PWM outputs, with PWM
outputs using different PWM settings
A mix of static and PWM outputs, with PWM
outputs all using the same PWM setting
All outputs PWM using the same PWM
setting
14
14 15
.
______________________________________________________________________________________
15
1
1
2
2
14
APPLICATION
3
3
15 16
4
4
15
5
5
1
6
6
1
2
7
7
3
8
2
8
4
9
9 10 11 12 13 14 15
5
10
3
EACH MASTER INTENSITY
TIMESLOT CONTAINS 16
6
11
PWM CYCLES
7
12
4
8
13
Set the master, O16 intensity register 0x0E to any value 0x00 to 0x0F.
The global intensity G bit in the configuration register is don't care.
The output intensity registers 0x10 through 0x17 are don't care.
Set the master, O16 intensity register 0x0E to any value from 0x10 to 0xFF.
Clear global intensity G bit to 0 in the configuration register to disable global intensity
control.
For the static outputs, set the output intensity value to 0xF.
For the PWM outputs, set the output intensity value in the range 0x0 to 0xE.
As above. Global intensity control cannot be used with a mix of static and PWM
outputs, so write the individual intensity registers with the same PWM value.
Set the master, O16 intensity register 0x0E to any value except from 0x10 to 0xFF.
Set global intensity G bit to 1 in the configuration register to enable global intensity
control.
The master, O16 intensity register 0x0E is the only intensity register used.
The output intensity registers 0x10 through 0x17 are don't care.
9 10 11 12 13 14 15 16
ONE PWM PERIOD IS 240 CYCLES OF THE 32kHz PWM
14
OSCILLATOR. A PWM PERIOD CONTAINS 15 MASTER
5
15
6
1
1
INTENSITY TIMESLOTS
2
2
.
.
7
8
Figure 14. Master Set to 15/15
RECOMMENDED CONFIGURATION
1
.
14
9
2
15
10
1
2
11
3
4
12
5
6
13
7
8
14
9
10
15
11
12
1
13
14
2
15
1
2
.