16-Port I/O Expander with LED Intensity

Control, Interrupt, and Hot-Insertion Protection

______________________________________________________________________________________

19

Figure 16. Individual (or Global) Set to 15/16

MASTER INTENSITY TIMESLOT

1

2

3

4

5

6

7

8

9 10 11 12 13 14 15 16

NEXT MASTER INTENSITY TIMESLOT

1

2

3

4

5

6

7

8

9 10 11 12 13 14 15 16

Figure 15. Individual (or Global) Set to 1/16

MASTER INTENSITY TIMESLOT

1

2

3

4

5

6

7

8

9 10 11 12 13 14 15 16

NEXT MASTER INTENSITY TIMESLOT

1

2

3

4

5

6

7

8

9 10 11 12 13 14 15 16

Figure 17. Individual (or Global) Set to 16/16

MASTER INTENSITY TIMESLOT CONTROL IS IGNORED

1

2

3

4

5

6

7

8

9 10 11 12 13 14 15 16

1

2

3

4

5

6

7

8

9 10 11 12 13 14 15 16

Table 11. PWM Intensity Settings (Blink Disabled)

PWM DUTY CYCLE

OUTPUT BLINK PHASE 0

REGISTER BIT = 0

PWM DUTY CYCLE

OUTPUT BLINK PHASE 0

REGISTER BIT = 1

OUTPUT

(OR

GLOBAL)

INTENSITY

SETTING

LOW TIME

HIGH TIME

LED BEHAVIOR WHEN

OUTPUT BLINK PHASE 0

REGISTER BIT = 0

(LED IS ON WHEN

OUTPUT IS LOW)

LOW TIME

HIGH TIME

LED BEHAVIOR WHEN

OUTPUT BLINK PHASE 0

REGISTER BIT = 1

(LED IS ON WHEN

OUTPUT IS LOW)

0x0

1/16

15/16

Lowest PWM intensity

15/16

1/16

Highest PWM intensity

0x1

2/16

14/16

14/16

2/16

0x2

3/16

13/16

13/16

3/16

0x3

4/16

12/16

12/16

4/16

0x4

5/16

11/16

11/16

5/16

0x5

6/16

10/16

10/16

6/16

0x6

7/16

9/16

9/16

7/16

0x7

8/16

8/16

8/16

8/16

0x8

9/16

7/16

7/16

9/16

0x9

10/16

6/16

6/16

10/16

0xA

11/16

5/16

5/16

11/16

0xB

12/16

4/16

4/16

12/16

0xC

13/16

3/16

3/16

13/16

0xD

14/16

2/16

2/16

14/16

0xE

15/16

1/16

Highest PWM intensity

1/16

15/16

Lowest PWM intensity

0xF

Static low

Static low

Full intensity, no PWM

(LED on continuously)

Static high

impedance

Static high

impedance

LED off continuously