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参数资料
| 型号： | ISL29001IROZ |
| 厂商： | Intersil |
| 文件页数： | 7/11页 |
| 文件大小： | 0K |
| 描述： | IC SENSOR LIGHT-DGTL I2C 6-ODFN |
| 标准包装： | 183 |
| 带接近传感器： | 无 |
| 波长： | 550nm |
| 电源电压： | 2.3 V ~ 3.3 V |
| 输出类型： | I²C? |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WDFN 裸露焊盘 |
| 包装： | 散装 |
ISL29001
t int = 100ms ? ------------------
FSR = 10000lux ? ------------------
Data Registers
The ISL29001 contains four 8-bit data registers. These
registers cannot be specifically addressed, as is conventional
with other I 2 C peripherals; instead, performing a read operation
R EXT
100k Ω
100k Ω
R EXT
(EQ. 2)
(EQ. 3)
on the device always returns all available registers in ascending
order. See Table 2 for a description of each register.
TABLE 2. DATA REGISTERS
R EXT is nominally 100k Ω , and provides 100ms internal
timing and a 1 to 10,000lux range for Diode 1. Doubling this
resistor value to 200k Ω halves the internal oscillator
ADDRESS
00H
01H
02H
03H
CONTENTS
Least-significant byte of most recent sensor reading.
Most-significant byte of most recent sensor reading.
Least-significant byte of integration counter value
corresponding to most recent sensor reading.
Most-significant byte of integration counter value
frequency, providing 200ms internal timing. In addition, the
maximum lux range of Diode 1 is also halved, from
10,000 lux to 5,000 lux, and the resolution is doubled, from
3.3 counts per lux to 6.6 counts per lux.
The acceptable range of this resistor is 50k Ω (providing
50ms internal timing, 20,000 lux maximum reading, ~1.6
counts per lux) to 500k Ω (500ms internal timing, 2,000lux
corresponding to most recent sensor reading.
The first two 8-bit data registers contain the most recent
maximum reading, ~16 counts per lux).
TABLE 3. R EXT RESISTOR SELECTION GUIDE
sensor reading. The meaning of the specific value stored in
these data registers depends on the command written via
the I 2 C interface; see Table 1 for information on the various
commands. The first byte read over the I 2 C interface is the
R EXT
(k Ω )
50 (Min)
INTEGRATION
TIME
(ms)
50
LUX RANGE RESOLUTION,
(lux) COUNTS/LUX
20,000 1.6
least-significant byte; the second is the most significant. This
byte ordering is often called “little-endian” ordering.
The third and fourth 8-bit data registers contain the
integration counter value corresponding to the most recent
100
Recommended
200
500 (Max)
100
200
500
10,000
5,000
2,000
3
6
16
sensor reading. The ISL29001 includes a free-running
oscillator, each cycle of which increments a 16-bit counter. At
the end of each integration period, the value of this counter
is made available in these two 8-bit registers. Like the
sensor reading, the integration counter value is read across
the I 2 C bus in little-endian order.
Note that the integration counter value is only available
When using one of the three internal timing modes, the
ISL29001’s resolution is determined by the ratio of the max
lux range to 32,768, the number of clock cycles per
integration.
Equation 4 describes the light intensity as a function of the
sensor reading, and as a function of the external resistor.
E ( Lux ) = ---------------- ? Data1
E ( Lux ) = ---------------- ? ------------------------------------------- ? Data1
when using one of the three externally-timed operating
modes; when using internally-timed modes, the device will
NAK after the two-byte sensor reading has been read.
Internal Timing
FSR
32768
1 10 , 000lux
32768 ( R EXT ? 100k Ω )
(EQ. 4)
f osc = 327.6kHz ? ------------------
t int = ----------
When using one of the three internal timing modes, each
integration period of the ISL29001 is timed by 32,768 clock
cycles of an internal oscillator. The nominal frequency of the
internal oscillator is 327.6kHz, which provides 100ms
internally-timed integration periods. The oscillator frequency
is dependent upon an external resistor, R EXT , and can be
adjusted by selecting a different resistor value. The
resolution and maximum range of the device are also
affected by changes in R EXT .
The oscillator frequency can be calculated using Equation 1:
100k Ω (EQ. 1)
R EXT
Accordingly, the integration time, t int , is also a function of R EXT,
as shown in Equation 2.
The full scale range in lux, FSR, is also scaled by R EXT.
7
where E is the measured light intensity, Data1 is the sensor
reading, and R EXT is external resistor value.
External Timing
When using one of the three external timing modes, each
integration period of the ISL29001 is determined by the time
which passes between consecutive external timing
commands received over the I 2 C bus. The user starts the
integration by sending an external command and stops the
integration by sending another external command. The
integration time, t int , therefore is determined by Equation 5:
i I2C
(EQ. 5)
f I2C
where:
i I2C is the number of I 2 C clock cycles to obtain the t int.
f I2C is the I 2 C operating frequency.
FN6166.7
November 17, 2011
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| ISL29001IROZ-EVALZ | 功能描述:EVALUATION BOARD FOR ISL29001 RoHS:是 类别:编程器，开发系统 >> 评估板 - 传感器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- |
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