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ISL29028IROZ データシート(PDF) 8 Page - Intersil Corporation

部品番号 ISL29028IROZ
部品情報  Low Power Ambient Light and Proximity Sensor with Intelligent Interrupt and Sleep Modes
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メーカー  INTERSIL [Intersil Corporation]
ホームページ  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL29028IROZ データシート(HTML) 8 Page - Intersil Corporation

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8
FN6780.2
November 4, 2011
Principles of Operation
I2C Interface
The ISL29028’s I2C interface slave address is internally
hardwired as 0b100010<x>, where “0b” signifies binary
notation and x represents the logic level on pin ADDR0.
Figure 2 shows a sample one-byte read. The I2C bus
master always drives the SCL (clock) line, while either
the master or the slave can drive the SDA (data) line.
Every I2C transaction begins with the master asserting a
start condition (SDA falling while SCL remains high). The
first transmitted byte is initiated by the master and
includes 7 address bits and a R/W bit. The slave is
responsible for pulling SDA low during the ACK bit after
every transmitted byte.
Each I2C transaction ends with the master asserting a
stop condition (SDA rising while SCL remains high).
For more information about the I2C standard, please
consult the PhilipsI2C specification documents.
Photodiodes and ADCs
The ISL29028 contains two photodiode arrays which
convert photons (light) into current. The ALS
photodiodes are constructed to mimic the human eye’s
wavelength response curve to visible light (see Figure 6).
The ALS photodiodes’ current output is digitized by a
12-bit ADC in 100ms. These 12 bits can be accessed by
reading from I2C registers 0x9 and 0xA when the ADC
conversion is completed.
The ALS converter is a charge-balancing integrating
12-bit ADC. Charge-balancing is best for converting small
current signals in the presence of periodic AC noise.
Integrating over 100ms highly rejects both 50Hz and
60Hz light flicker by picking the lowest integer number of
cycles for both 50Hz/60Hz frequencies.
TABLE 10. REGISTER 0x08 (PROX_DATA) - PROXIMITY SENSOR DATA
BIT #
ACCESS
DEFAULT
BIT NAME
FUNCTION/OPERATION
7:0
RO
0x00
PROX_DATA
(Proximity Data)
Results of 8-bit proximity sensor ADC conversion
TABLE 11. REGISTER 0x09 (ALSIR_DT1) - ALS/IR SENSOR DATA (LOWER 8 BITS)
BIT #
ACCESS
DEFAULT
BIT NAME
FUNCTION/OPERATION
7:0
RO
0x00
ALSIR_DATA
(ALS/IR Data)
Lower 8 bits (of 12 bits) from result of ALS/IR sensor conversion
TABLE 12. REGISTER 0x0A (ALSIR_DT2) - ALS/IR SENSOR DATA (UPPER 4 BITS)
BIT #
ACCESS
DEFAULT
BIT NAME
FUNCTION/OPERATION
7:4
RO
0x00
(Unused)
Unused bits.
3:0
RO
0x00
ALSIR_DATA
(ALS/IR Data)
Upper 4 bits (of 12 bits) from result of ALS/IR sensor conversion
TABLE 13. REGISTER 0x0E (TEST1) - TEST MODE
BIT #
ACCESS
DEFAULT
BIT NAME
FUNCTION/OPERATION
7:0
RW
0x00
(Write as 0x00)
Test mode register. When 0x00, in normal operation.
TABLE 14. REGISTER 0x0F (TEST2) - TEST MODE 2
BIT #
ACCESS
DEFAULT
BIT NAME
FUNCTION/OPERATION
7:0
RW
0x00
(Write as 0x00)
Test mode register. When 0x00, in normal operation.
FIGURE 2. I2C DRIVER TIMING DIAGRAM FOR MASTER AND SLAVE CONNECTED TO COMMON BUS
START
W A
A
A6 A5 A4 A3 A2 A1 A0 W A R7 R6 R5 R4 R3 R2 R1 R0 A
A6 A5 A4 A3 A2 A1 A0 W A
A
A
A D7 D6 D5 D4 D3D2 D1D0
13
5
7
13
57
1 2 3
4 5
6
9
2
4
6
STOP START
SDA DRIVEN BY MASTER
DEVICE ADDRESS
SDA DRIVEN BY ISL29028
DATA BYTE0
REGISTER ADDRESS
SLAVE
DEVICE ADDRESS
I2C DATA
SDA DRIVEN BY MASTER
SDA DRIVEN BY MASTER
24
68 9
2
468 9
7
8
1
3
5
7 8
9
I2C SDA
I2C SDA
I2C CLK
MASTER
(ISL29028)
ISL29028


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