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| 型号： | ISL76683AROZ-T7A |
| 厂商： | Intersil |
| 文件页数： | 11/17页 |
| 文件大小： | 0K |
| 描述： | IC SENSOR LIGHT-DGTL I2C 6-ODFN |
| 标准包装： | 1 |
| 带接近传感器： | 无 |
| 波长： | 540nm |
| 电源电压： | 2.5 V ~ 3.3 V |
| 输出类型： | I²C? |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 其它名称： | ISL76683AROZ-T7ADKR |
ISL76683
Gain/Range, Range (k)
The Gain/Range can be programmed in the control register 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
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 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 trade-off 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 f OSC 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).
Integration time affects the measurement resolution. For better
resolution, use a longer integration time. For short and fast
conversions, use a shorter integration time.
The ISL76683 offers 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
This timing mode is programmed in the command register
00(hex) bit 5. Most applications will be using this timing mode.
RANGE1
f OSC = 327kHz
RESOLUTION
RANGE4
f OSC = 655kHz
RESOLUTION
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 f OSC .
t int = 2 × ----------
n
16
t INT (ms)
200
LUX/COUNT
0.01
t INT (ms)
100
(LUX/COUNT)
1
n 1
f osc
for Internal Timing Mode only
(EQ. 9)
12
8
4
12.8
0.8
0.05
0.24
3.90
62.5
6.4
0.4
0.025
16
250
4000
n = 4, 8, 12, and 16. n is the number of bits of resolution.
Therefore, 2 n is the number of clock cycles. n can be programmed
at the command register 00(hex) bits 1 and 0.
fosc1 = --- × ------------------ × 655 kHz
R EXT
fosc2 = ------------------ × 655 kHz
n R EXT
t int 1 = 2 × ----------------------------------------------
n R EXT
t int 2 = 2 × ----------------------------------------------
655kHz × 100k Ω
NOTE: R EXT = 100k Ω
External Scaling Resistor R EXT and f osc
The ISL76683 uses an external resistor R EXT to fix its internal
oscillator frequency, f OSC . Consequently, R EXT determines the
f OSC , integration time and the FSR of the device. f OSC , a dual
speed mode oscillator, is inversely proportional to R EXT . For user
simplicity, the proportionality constant is referenced to fixed
constants 100k Ω and 655kHz:
1 100k Ω (EQ. 6)
2
100k Ω (EQ. 7)
R EXT
f OSC 1 is oscillator frequency when Range1 or Range2 are set.
This is nominally 327kHz when R EXT is 100k Ω .
f OSC 2 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, f OSC
runs at half speed compared to when Range/Gain bits are set to
Since f OSC is dual speed depending on the Gain/Range bit, t int is
dual time. The integration time as a function of R EXT and n is:
(EQ. 10)
327kHz × 100k Ω
t int1 is the integration time when the device is configured for
Internal Timing Mode and Gain/Range is set to Range1 or
Range2.
(EQ. 11)
t int2 is the integration time when the device is configured for
Internal Timing Mode and Gain/Range is set to Range3 or
Range4.
TABLE 13. INTEGRATION TIMES FOR TYPICAL R EXT VALUES
RANGE1 RANGE3
RANGE2 RANGE4
R EXT
(k Ω) n = 16-BIT n = 12-BIT n = 12-BIT n=4
50 100 6.4 3.2 0.013
100** 200 13 6.5 0.025
f OSC 1 = --- ( f OSC 2 )
Range3 and Range4.
1
2
(EQ. 8)
200
500
400
1000
26
64
13
32
0.050
0.125
*Integration time in milliseconds
**Recommended R EXT resistor value
11
FN7697.7
March 24, 2014
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