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ISL29120
Data Registers (0x02 and 0x03)
ISL29120 has two 8-bit read-only registers to hold the LSByte
and MSByte data from the ADC. The most significant byte (MSB)
is accessed at address 0x03, and the least significant byte (LSB)
is accessed at address 0x02. For 16-bit resolution, the data is
from D0 to D15; for 12-bit resolution, the data is from D0 to D11;
for 8-bit resolution, the data is from D0 to D7. The registers are
refreshed after every conversion cycle.
periodic noise signal significantly improves the light sensor
output signal in the presence of noise.
Typical Application Circuit
A typical application for the ISL29120 is shown in Figure 6. The
ISL29120’s I 2 C address is internally hardwired as 1000110x.
The device can be connected to a system’s I 2 C bus with other I 2 C
compliant devices.
TABLE 7. DATA REGISTERS
VDD_PULLUP
VDD
INT
VDD
REXT
SDA
GND
SCL
ISL29120
ADDRESS
0x02
0x03
CONTENTS
D0 is LSB for 4, 8, 12 or 16-bit resolution; D3 is MSB for
4-bit resolution; D7 is MSB for 8-bit resolution
D15 is MSB for 16-bit resolution; D11 is MSB for 12-bit
resolution
SMBMaster
INT
SDA
SCL
PULL-UP RESISTORS
2.7k ? TO 10k ?
4
6
5
R2
100 ?
1
3
2
R1
499k ?
C1
1μF
Interrupt Threshold Registers
Registers 0x04 and 0x05 set the low (LO) threshold for the
interrupt pin and the interrupt flag. Register 0x04 is the LSByte
and 0x05 is the MSByte. By default, the Interrupt threshold LO is
00 hex for both LSByte and MSByte.
Registers 0x06 and 0x07 set the high (HI) threshold for the
interrupt pin and the interrupt flag. Register 0x06 is the LSByte
and 0x07 is the MSByte. By default, the Interrupt threshold HI is
0xFF for both LSByte and MSByte.
Note that there is only one set of threshold registers as ISL29120
performs R, G and B conversions sequentially. If different
thresholds are required for each color, then these threshold
registers must be re-configured prior to issuing a convert start
command. If a common threshold setting for the R, G and B is
desired then the threshold register can be initialized at power-up.
Interrupt threshold registers should be programmed
appropriately for the selected ADC conversion resolution. For
example, for 12-bit mode, only the corresponding 12 bits of the
threshold registers must be programmed and the remaining bits
should be set to zero.
Interrupt Function
An interrupt event (IFLG) is indicated by 0x00[2]. The user must
clear this bit during the device initialization. The ISL29120 will
issue an interrupt indication by setting the IFLG bit if the count in
Register 0x02 and 0x03 are outside the user's programmed
window in interrupt threshold registers. Read Register 0x00 to
clear the interrupt flag. Interrupt flags should also be cleared
following a interrupt threshold configuration change.
An Interrupt persistency 0x01[1:0] option is available for interrupt
event control for the RGB ambient light measurement. Persistency
requires x-in-a-row interrupt flags before the INT pin is driven low.
The user must read Register 0x0 to clear the Interrupt.
Noise/Flicker Rejection
Integrating ADC’s provide excellent flicker/noise-rejection for
periodic sources whose frequency is an integer multiple of the
conversion rate. For instance, a 60Hz AC unwanted signal’s sum
from 0ms to k*16.66ms (k = 1,2...k i ) is zero. Similarly, setting
the device’s integration time to be an integer multiple of the
6
FIGURE 6. ISL29120 TYPICAL APPLICATION CIRCUIT
Suggested PCB Footprint
It is important that users check the “Surface Mount Assembly
Guidelines for Optical Dual FlatPack No Lead (ODFN) Package”
before starting ODFN product board mounting.
http://internal.intersil.com/content/dam/Intersil/documents/tb
47/tb477.pdf
PCB Layout Considerations
The ISL29120 is relatively insensitive to PCB layout. There are
only a few considerations that will ensure best performance.
Route the supply and I 2 C traces away from sources of digital
switching noise. Use a 1μF power-supply decoupling capacitors
close to the device. A series resistor in the power supply to isolate
switching noise elsewhere in the system is recommended. The
499k ? resistor should be placed close to the device and away from
any noise sources.
Soldering Considerations
Convection heating is recommended for reflow soldering;
direct-infrared heating is not recommended. The plastic ODFN
package does not require a custom reflow soldering profile, and
is qualified to +260°C. A standard reflow soldering profile with a
+260°C maximum is recommended.
RGB Spectral Sensitivity
Typical spectral response of the ISL29120’s Red, Green and Blue
channels is shown in Figure 2. It should be observed that there is
a considerable cross-spectral sensitivity among three colors. In
addition, all three channels have a strong sensitivity to light in
infra-red spectrum.
It is therefore imperative that the a color sense system-based on
ISL29120 be calibrated for the desired application using a
mathematical model to compensate for the cross-spectral
coupling between the Red, Green and Blue channels.
For operation in infra-red rich environments, such as sunlight or
incandescent lighting, use of an external Infrared filter is required
for meaningful spectral color sensing.
FN8314.0
May 29, 2012
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