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ISL29027IROZ-T7 데이터시트(PDF) 7 Page - Intersil Corporation

부품명 ISL29027IROZ-T7
상세설명  Proximity Sensor with Intelligent Interrupt and Sleep Modes
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제조업체  INTERSIL [Intersil Corporation]
홈페이지  http://www.intersil.com/cda/home
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ISL29027
7
FN7815.0
February 7, 2011
Principles of Operation
I2C Interface
The ISL29027’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 3 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
Philips™ I2C specification documents.
Photodiodes and ADCs
The ISL29027 contains photodiode arrays which convert photons
(light) into current. The proximity sensor is an 8-bit ADC. When
proximity sensing is enabled, the IRDR pin will drive a user-
supplied infrared LED, the emitted IR reflects off an object (i.e., a
human head) back into the ISL29027, and a sensor converts the
reflected IR wave to a current signal in 0.54ms. The ADC
subtracts the IR reading before and after the LED is driven (to
remove ambient IR such as sunlight), and converts this value to a
digital count stored in Register 0x8. Because of the conversion
times, the user must let the ADCs perform one full conversion
first before reading from I2C Registers PROX_DATA (wait
0.54ms). The proximity sensor runs continuously with a time
between conversions decided by PROX_SLP (Register 1 Bits
[6:4]).(as shown in Figure 4).
Proximity Sensing
When proximity sensing is enabled (PROX_EN = 1), the external
IR LED is driven for 0.1ms by the built-in IR LED driver through
the IRDR pin. The amplitude of the IR LED current depends on
Register 1 bit 3: PROX_DR. If this bit is low, the load will see a
TABLE 6. REGISTER 0x04 (PROX_HT) - INTERRUPT HIGH THRESHOLD FOR PROXIMITY SENSOR
BIT #
ACCESS
DEFAULT
BIT NAME
FUNCTION/OPERATION
7:0
RW
0xFF
PROX_HT
(Prox Threshold)
8-bit interrupt high threshold for proximity sensing
TABLE 7. 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 8. 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 9. 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 3. 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 ISL29027
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
(ISL29027)
FIGURE 4. CURRENT DRIVE MODE OPTIONS
PROX
SENSOR
ACTIVE
IRDR
(CURRENT
DRIVER)
0.54ms FOR
PROX
CONVERSION
SERIES OF
CURRENT
PULSES
TOTALING 0.1ms
SLEEP TIME
(PROX_SLP)
TIME
TIME


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