ISL29028IROZ-T7 Intersil, ISL29028IROZ-T7 Datasheet - Page 8

• Manufacturer Part Number: ISL29028IROZ-T7
• Description: IC SENSOR LIGHT-PROXIMITY 8ODFN
• Manufacturer: Intersil

Specifications of ISL29028IROZ-T7

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Principles of Operation
I
The ISL29028’s I
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 I
master always drives the SCL (clock) line, while either
the master or the slave can drive the SDA (data) line.
Every I
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 I
stop condition (SDA rising while SCL remains high).
I
SLAVE
I
I
MASTER
I
2
2
2
2
2
C SDA
C DATA
C SDA
C CLK
C Interface
BIT #
BIT #
BIT #
BIT #
BIT #
7:0
7:4
3:0
7:0
7:0
7:0
(ISL29028)
2
2
C transaction ends with the master asserting a
C transaction begins with the master asserting a
FIGURE 2. I
START
ACCESS
ACCESS
ACCESS
ACCESS
ACCESS
RO
RO
RO
RO
RO
A6 A5 A4 A3 A2 A1 A0 W A R7 R6 R5 R4 R3 R2 R1 R0 A
SDA DRIVEN BY MASTER
RO
1
TABLE 11. REGISTER 0x09 (ALSIR_DT1) - ALS/IR SENSOR DATA (LOWER 8 BITS)
2
TABLE 12. REGISTER 0x0A (ALSIR_DT2) - ALS/IR SENSOR DATA (UPPER 4 BITS)
C interface slave address is internally
DEVICE ADDRESS
2
2
3
C DRIVER TIMING DIAGRAM FOR MASTER AND SLAVE CONNECTED TO COMMON BUS
TABLE 10. REGISTER 0x08 (PROX_DATA) - PROXIMITY SENSOR DATA
DEFAULT
DEFAULT
DEFAULT
DEFAULT
4
DEFAULT
0x00
0x00
0x00
0x00
0x00
5
0x00
8
6
7
TABLE 14. REGISTER 0x0F (TEST2) - TEST MODE 2
TABLE 13. REGISTER 0x0E (TEST1) - TEST MODE
W A
8
A
9
(Write as 0x00)
(Write as 0x00)
(Proximity Data)
(ALS/IR Data)
(ALS/IR Data)
ALSIR_DATA
ALSIR_DATA
BIT NAME
BIT NAME
BIT NAME
BIT NAME
1
PROX_DATA
BIT NAME
(Unused)
REGISTER ADDRESS
SDA DRIVEN BY MASTER
2
3
2
4
C bus
5
ISL29028
6
Lower 8 bits (of 12 bits) from result of ALS/IR sensor conversion
Unused bits.
Upper 4 bits (of 12 bits) from result of ALS/IR sensor conversion
Test mode register. When 0x00, in normal operation.
Test mode register. When 0x00, in normal operation.
7
Results of 8-bit proximity sensor ADC conversion
8
9
A
STOP START
For more information about the I
consult the Philips
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 I
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.
SDA DRIVEN BY MASTER
A6 A5 A4 A3 A2 A1 A0 W A
1
2
DEVICE ADDRESS
FUNCTION/OPERATION
FUNCTION/OPERATION
FUNCTION/OPERATION
FUNCTION/OPERATION
FUNCTION/OPERATION
3
2
C registers 0x9 and 0xA when the ADC
4
™
5
I
6
2
C specification documents.
7
8
A
A D7 D6 D5 D4 D3 D2 D1 D0
9
1
2
2
SDA DRIVEN BY ISL29028
C standard, please
3
DATA BYTE0
4
5
6
March 2, 2010
7
8
FN6780.1
9