CAT9532HV6I-G datasheet(9/18 Pages) ONSEMI

Part #	CAT9532HV6I-G

Description	16-bit Programmable LED Dimmer with I2C Interface

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Manufacturer	ONSEMI [ON Semiconductor]

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CAT9532

The Input Register 0 and Input Register 1 reflect the

incoming logic levels of the I/O pins, regardless of

whether the pin is defined as an input or an output.

These registers are read only ports. Writes to the input

registers will be acknowledged but will have no effect.

Table 2. Input Register 0 and Input Register 1

INPUT0

LED

7

LED

6

LED

5

LED

4

LED

3

LED

2

LED

1

LED

0

bit

7

6

5

4

3

2

1

0

default

X

INPUT1

LED

15

LED

14

LED

13

LED

12

LED

11

LED

10

LED

9

LED

8

bit

7

6

5

4

3

2

1

0

default

X

The Frequency Prescaler 0 and Frequency Prescaler

1 registers (PSC0, PSC1) are used to program the

period of the pulse width modulated signals BLINK0

and BLINK1 respectively:

T_BLINK0 = (PSC0 + 1) / 152;

T_BLINK1 = (PSC1 + 1) / 152

Table 3. Frequency Prescaler 0 and Frequency

Prescaler 1 Registers

PSC0

bit

7

6

5

4

3

2

1

0

default

0

PSC1

bit

7

6

5

4

3

2

1

0

default

0

The PWM Register 0 and PWM Register 1 (PWM0,

PWM1) are used to program the duty cycle of BLINK0

and BLINK1 respectively:

Duty Cycle_BLINK0 = PWM0 / 256;

Duty Cycle_BLINK1 = PWM1 / 256

After writing to the PWM0/1 register an 8-bit internal

counter starts to count from 0 to 255. The outputs are

low (LED on) when the counter value is less than the

value programmed into PWM register. The LED is off

when the counter value is higher than the value

written into PWM register.

Table 4. PWM Register 0 and PWM Register 1

PWM0

bit

7

6

5

4

3

2

1

0

default

1

0

PWM1

bit

7

6

5

4

3

2

1

0

default

1

0

Every LED driver output can be programmed to one of

four states, LED OFF, LED ON, LED blinks at BLINK0

rate and LED blinks at BLINK1 rate using the LED

Selector Registers (Table 5).

Table 5. LED Selector Registers

LS0

LED 3

LED 2

LED 1

LED 0

bit

7

6

5

4

3

2

1

0

default

0

LS1

LED 7

LED 6

LED 5

LED 4

bit

7

6

5

4

3

2

1

0

default

0

LS2

LED 11

LED 10

LED 9

LED 8

bit

7

6

5

4

3

2

1

0

default

0

LS3

LED 15

LED 14

LED 13

LED 12

bit

7

6

5

4

3

2

1

0

default

0

The LED output (LED0 to LED15) is set by the 2 bits

value from the corresponding LSx Register (x = 0 to 3):

00 = LED Output set Hi-Z (LED Off – Default)

01 = LED Output set LOW (LED On)

10 = LED Output blinks at BLINK0 Rate

11 = LED Output blinks at BLINK1 Rate

9

Doc. No. MD-9001 Rev. E

Characteristics subject to change without notice

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