TCS3471

COLOR LIGHT-TO-DIGITAL CONVERTER

TAOS115 − MARCH 2011

14

r

r

Copyright

E 2011, TAOS Inc.

The LUMENOLOGY

r Company

www.taosinc.com

RGBC Interrupt Threshold Registers (0x04 − 0x07)

The RGBC interrupt threshold registers provides the values to be used as the high and low trigger points for

the comparison function for interrupt generation. If the value generated by the clear channel crosses below the

lower threshold specified, or above the higher threshold, an interrupt is asserted on the interrupt pin.

Table 6. RGBC Interrupt Threshold Registers

REGISTER

ADDRESS

BITS

DESCRIPTION

AILTL

0x04

7:0

RGBC clear channel low threshold lower byte

AILTH

0x05

7:0

RGBC clear channel low threshold upper byte

AIHTL

0x06

7:0

RGBC clear channel high threshold lower byte

AIHTH

0x07

7:0

RGBC clear channel high threshold upper byte

Persistence Register (0x0C)

The persistence register controls the filtering interrupt capabilities of the device. Configurable filtering is

provided to allow interrupts to be generated after each integration cycle or if the integration has produced a result

that is outside of the values specified by the threshold register for some specified amount of time.

Table 7. Persistence Register

6

75

4

APERS

2

31

0

PERS

Reserved

Address

0x0C

FIELD

BITS

DESCRIPTION

Reserved

7:4

Reserved

APERS

3:0

Interrupt persistence. Controls rate of interrupt to the host processor.

FIELD VALUE

MEANING

INTERRUPT PERSISTENCE FUNCTION

0000

Every

Every RGBC cycle generates an interrupt

0001

1

1 clear channel value outside of threshold range

0010

2

2 clear channel consecutive values out of range

0011

3

3 clear channel consecutive values out of range

0100

5

5 clear channel consecutive values out of range

0101

10

10 clear channel consecutive values out of range

0110

15

15 clear channel consecutive values out of range

0111

20

20 clear channel consecutive values out of range

1000

25

25 clear channel consecutive values out of range

1001

30

30 clear channel consecutive values out of range

1010

35

35 clear channel consecutive values out of range

1011

40

40 clear channel consecutive values out of range

1100

45

45 clear channel consecutive values out of range

1101

50

50 clear channel consecutive values out of range

1110

55

55 clear channel consecutive values out of range

1111

60

60 clear channel consecutive values out of range