ISL29004IROZ-T7【PDF 10/17 页】IC SENSOR LIGHT-DGTL I2C 8-ODFN

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ISL29004

maximum number of counts is stored in the data register

named COUNTER

constant is referenced to fixed constants 100k Ω and

655kHz:

fosc1 = --- × ------------------ × 655 kHz

R EXT

fosc2 = ------------------ × 655 kHz

COUNTER is the number increments accrued for between

integration time for External Timing Mode.

Gain/Range, Range(k)

The Gain/Range can be programmed in the control register

1 100k Ω

2

100k Ω

R EXT

(EQ. 6)

(EQ. 7)

to give Range (k) determining the FSR. Note that Range(k)

is not the FSR. See Equation 3. Range(k) provides four

constants depending on programmed k that will be scaled by

R EXT . See Table 9. Unlike R EXT , Range(k) dynamically

adjusts the FSR. This function is especially useful when light

conditions are varying drastically while maintaining excellent

resolution.

Number of Clock Cycles, n-bit ADC

fosc1 is oscillator frequency when Range1 or Range2 are

set. This is nominally 327kHz when R EXT is 100k Ω .

fosc2 is the oscillator frequency when Range3 or Range4

are set. This is nominally 655kHz when R EXT is 100k Ω .

When the Range/Gain bits are set to Range1 or Range2,

fosc runs at half speed comapred to when Range/Gain bits

are set to Range3 and Range4.

f osc 1 = --- ( f osc 2 )

The number of clock cycles determines “n” in the n-bit ADC; 2 n

clock cycles is a n-bit ADC. n is programmable in the command

1

2

(EQ. 8)

register in the width function. Depending on the application, a

good balance of speed, and resolution has to be considered

when deciding for n. For fast and quick measurement, choose

the smallest n = 4. For maximum resolution without regard of

time, choose n = 16. Table 12 compares the tradeoff between

integration time and resolution. See Equations 10 and 11 for the

relation between integration time and n. See Equation 3 for the

relation of n and resolution.

TABLE 12. RESOLUTION AND INTEGRATION TIME

SELECTION

The automatic fosc adjustment feature allows significant

improvement of signal-to-noise ratio when detecting very low

Lux signals.

Integration Time or Conversion Time

Integration time is the period during which the device’s

analog-to-digital ADC converter samples the photodiode

current signal for a Lux measurement. Integration time, in

other words, is the time to complete the conversion of analog

photodiode current into a digital signal-number of counts.

RANGE1

fosc = 327kHz

RANGE4

fosc = 655kHz

Integration time affects the measurement resolution. For

better resolution, use a longer integration time. For short and

RESOLUTION

TINT

RESOLUTION

fast conversions use a shorter integration time.

n

16

12

8

4

TINT (ms)

200

12.8

0.8

0.05

LUX/COUNT

0.01

0.24

3.90

62.5

(ms)

100

6.4

0.4

0.025

(LUX/COUNT)

1

16

250

4000

The ISL29004 offer user flexibility in the integration time to

balance resolution, speed and noise rejection. Integration time

can be set internally or externally and can be programmed in

the command register 00(hex) bit 5.

INTEGRATION TIME IN INTERNAL TIMING MODE

R EXT = 100k Ω

External Scaling Resistor R EXT and f osc

The ISL29004 use an external resistor R EXT to fix its

This timing mode is programmed in the command register

00(hex) bit 5. Most applications will be using this timing

mode. When using the Internal Timing Mode, f osc and n-bits

resolution determine the integration time. T int is a function of

the number of clock cycles and fosc.

T int = 2 × ------------- For Internal Timing Mode Only

osc

internal oscillator frequency, f osc . Consequently, R EXT

determines the fosc, integration time and the FSR of the

device. Fosc, a dual speed mode oscillator, is inversely

n 1

f

(EQ. 9)

proportional to R EXT . For user simplicity, the proportionality

n = 4, 8, 12, and16. n is the number of bits of resolution.

2 n therefore is the number of clock cycles. n can be

programmed at the command register 00(hex) bits 1 and 0.

10

FN6221.1

November 17, 2011

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