参数资料
型号: ISL29002IROZ
厂商: Intersil
文件页数: 6/10页
文件大小: 0K
描述: IC SENSOR LIGHT-DGTL I2C 8-ODFN
标准包装: 624
带接近传感器:
波长: 550nm
电源电压: 2.5 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: 8-WFDFN 裸露焊盘
包装: 管件
ISL29002
Command Register
The command register is used to define the ADC's
operations. Table 1 shows the primary commands used to
control the ADC.
Note that there are two classes of operating commands:
three for internal timing, and three for external (arbitrary)
timing.
When using any of the three internal timing commands, the
device self-times each conversion, which is nominally 110ms
When using any of the three external timing commands,
each command received by the device ends one conversion
and begins another. The integration time of the device is
thus the time between one I 2 C external timing command and
the next. The integration time can be between 1ms and
100ms. The external timing commands can be used to
synchronize the ADC’s integrating time to a PWM dimming
frequency in a backlight system in order to eliminate noise.
(with R EXT = 100k Ω).
COMMAND
8C(hex)
0C(hex)
TABLE 1. COMMAND REGISTERS AND FUNCTIONS
FUNCTION
ADC is powered-down. To enable ADC from a powered-down state, send any command to the ISL29002.
ADC is reset. A reset restarts the counter value to zero and returns the clock cycle to zero.
00(hex)
04(hex)
Internal Timing Mode. Integration
time is 110ms per photodiode.
ADC converts Diode 1’s current (I DIODE1 ) into an unsigned-magnitude 16-bit data.
ADC converts Diode 2’s current (I DIODE2 ) into unsigned-magnitude 16-bit data.
08(hex)
30(hex)
ADC converts I DIODE1 -I DIODE2 into 2’s-complement 16-bit data.
External Timing Mode. Each external ADC converts Diode 1’s current (I DIODE1 ) into unsigned-magnitude 16-bit data.
34(hex)
38(hex)
1xxx_xxxx
(binary)
timing command sent to the device
ends one integration period and
begins another.
ADC converts Diode 2’s current (I DIODE1 ) into unsigned-magnitude 16-bit data.
ADC converts I DIODE1 -I DIODE2 into 2’s-complement 16-bit data.
I 2 C communication test. The value written to the command register can be read
back via the I 2 C bus.
I 2 C DATA
Start
DEVICE ADDRESS 40(h) to 47(h)
W
A
POWER DOWN CMD 8C(h)
A
STOP
I 2 C SDA In
A6
A5
A4
A3
A2
A1
A0
W
A
R7
R6
R5
R4
R3
R2
R1
R0
A
I 2 C SDA Out
SDA DRIVEN BY MASTER
A
SDA DRIVEN BY MASTER
A
I 2 C CLK In
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
FIGURE 11A. I 2 C WRITE TIMING DIAGRAM SAMPLE
I 2 C DATA
Start
DEVICE ADDRESS 44(HEX)
R/W A
LSB OF SENSOR READING
A
MSB OF SENSOR READING
STOP
I 2 C SDA In
A6
A5
A4
A3
A2
A1
A0
R
A
SDA DRIVEN BY ISL29002
A
SDA DRIVEN BY ISL29002
A
I 2 C SDA Out
SDA DRIVEN BY MASTER
A
D7
D6
D5
D4
D3
D2
D1
D0
A
D7
D6
D5
D4
D3
D2
D1
D0
A
I 2 C CLK In
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
FIGURE 11B. I 2 C READ TIMING DIAGRAM SAMPLE
FIGURE 11.
6
FN7465.2
December 1, 2006
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