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PDF SI1153 Data sheet ( Hoja de datos )
| Número de pieza | SI1153 | |
| Descripción | Proximity/Ambient Light Sensor IC | |
| Fabricantes | Silicon Laboratories | |
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Si1153 Data Sheet
Proximity/Ambient Light Sensor IC with I2C Interface
The Si1153-AA00/AA09/AA9x is an ambient light sensor, proximity, and gesture detec-
tor with I2C digital interface and programmable-event interrupt output.
This touchless sensor IC includes dual 23-bit analog-to-digital converters, an integrated
high-sensitivity array of visible and infrared photodiodes, a digital signal processor, and
three integrated LED drivers with programmable drive levels. The Si1153 offers excel-
lent performance under a wide dynamic range and a variety of light sources, including
direct sunlight. The Si1153 can also work under dark glass covers. The photodiode re-
sponse and associated digital conversion circuitry provide excellent immunity to artificial
light flicker noise and natural light flutter noise. With two or more LEDs, the Si1153 is
capable of supporting multiple-axis proximity motion detection. The Si1153 is provided in
a 10-lead 2x2 mm DFN package or in a 10-lead 2.9x4.9 mm LGA module with integra-
ted LED, and is capable of operation from 1.62 to 3.6 V over the –40 to +85 °C tempera-
ture range.
VDD
LIGHT
Regulator
ALS Photodiodes
.
.
(Filter Only in
AA09 & AA9X
versions)
Internal Osc.
ADC1
ADC2
Signal
Processor
and
Control
LED
Drivers
INT
SCL
SDA
I2C
Engine
AD I2C addr sel
LED1
LED2 *
LED3 **
* Pull up to VDD with 47 kOhm resistor to select primary I2C address (0x53),
or down to GND for alt I2C address 0x52.
** Pull up to VDD with 47 kOhm resistor
KEY FEATURES
• Proximity detector
• From under 1 cm, to 50 cm without
additional lensing.
• From under 1 cm, to 200 cm with
additional lensing (e.g., 5 mm
hemispherical lens as in our EVB).
• Up to three independent LED drivers.
• 30 current settings from 5.6 mA to 360
mA for each LED driver.
• Operates in direct sunlight with optional
on-die 940 nm passband filter.
• On die 940 bandpass filter that rejects
unwanted visible light and IR from
daylight and other sources (Si1153-
AA09/AA9X).
• Ambient light sensor
• <100 mlx resolution possible, allowing
operation under dark glass.
• Up to 128 klx dynamic range possible
across two ADC range settings.
• Industry’s lowest power consumption
• 1.62 to 3.6 V supply voltage.
• 9 μA average current (LED pulsed 25.6
μs every 800 ms at 180 mA plus 3 μA
Si1153 supply).
• <500 nA standby current.
• 25.6 μs LED “on” time keeps total power
consumption duty cycle low without
compromising performance or noise
community.
• Internal and external wake support.
• Built-in voltage supply monitor and
power-on reset controller.
APPLICATIONS
• Wearables
• Handsets
• Display backlighting control
• Consumer electronics
silabs.com | Smart. Connected. Energy-friendly.
Rev. 0.9
1 page  
Si1153 Data Sheet
Functional Description
Figure 3.3. Si1153 LGA Module Basic Application
3.1 Ambient Light Sensing
The Si1153 has photodiodes capable of measuring visible and infrared light. However, the visible photodiode is also influenced by infra-
red light. The measurement of illuminance requires the same spectral response as the human eye. If an accurate lux measurement is
desired, the extra IR response of the visible-light photodiode must be compensated. Therefore, to allow the host to make corrections to
the infrared light’s influence, the Si1153 reports the infrared light measurement on a separate channel. The separate visible and IR
photodiodes lend themselves to a variety of algorithmic solutions. The host can then take these two measurements and run an algo-
rithm to derive an equivalent lux level as perceived by a human eye. Having the IR correction algorithm running in the host allows for
the most flexibility in adjusting for system-dependent variables. For example, if the glass used in the system blocks visible light more
than infrared light, the IR correction needs to be adjusted.
If the host is not making any infrared corrections, the infrared measurement can be turned off in the CHAN_LIST parameter.
By default, the measurement parameters are optimized for indoor ambient light levels, where it is possible to detect low light levels. For
operation under direct sunlight, the ADC can be programmed to operate in a high signal operation so that it is possible to measure
direct sunlight without overflowing.
For low-light applications, it is possible to increase the ADC integration time. Normally, the integration time is 24.4 µs. By increasing this
integration time, the ADC can detect light levels as low as 100 mlx. The ADC integration time for the Visible Light Ambient measure-
ment can be programmed independently of the ADC integration time of the Infrared Light Ambient measurement. The independent ADC
parameters allow operation under glass covers having a higher transmittance to Infrared Light than Visible Light.
When operating in the lower signal range, or when the integration time is increased, it is possible to saturate the ADC when the ambient
light suddenly increases. Any overflow condition will have the corresponding data registers report a value of 0xFFddFF for 16-bit mode
and 0x7FFFFF for 24-bit mode. The host can adjust the ADC sensitivity to avoid an overflow condition. If the light levels return to a
range within the capabilities of the ADC, the corresponding data registers begin to operate normally.
The Si1153 can initiate ALS measurements either when explicitly commanded by the host or periodically through an autonomous proc-
ess. Refer to Section 4. Operational Modes for additional details.
Two ADCs can be used for simultaneous readings of the visible or proximity photodiode and black dark current reference photodiode.
When subtracted, these differential measurements remove dark current, reducing noise that enables lower light sensitivity.
silabs.com | Smart. Connected. Energy-friendly.
Rev. 0.9 | 4
5 Page 
Si1153 Data Sheet
Operational Modes
4. Operational Modes
The Si1153 can be in one of many operational modes at any time. It is important to consider the operation mode, since the mode has
an impact on the overall power consumption of the Si1153. The various modes are:
• Off Mode
• Initialization Mode
• Standby Mode
• Forced Conversion Mode
• Autonomous Mode
4.1 Off Mode
The Si1153 is in the Off Mode when VDD is either not connected to a power supply or if the VDD voltage is below the stated VDD_OFF
voltage described in the electrical specifications. As long as the parameters stated in Table 8.7 Absolute Maximum Ratings on page
43 are not violated, no current will flow through the Si1153. In the Off Mode, the Si1153 SCL and SDA pins do not interfere with other
I2C devices on the bus. Keeping VDD less than VDD_OFF is not intended as a method of achieving lowest system current draw. The
reason is that the ESD protection devices on the SCL, SDA, and INT pins also draw from a current path through VDD. If VDD is groun-
ded, for example, then current flows from system power to system ground through the SCL, SDA, and INT pull-up resistors and the
ESD protection devices. Allowing VDD to be less than VDD_OFF is intended to serve as a hardware method of resetting the Si1153
without a dedicated reset pin.
The Si1153 can also re-enter the Off Mode upon receipt of a software reset sequence. Upon entering Off Mode, the Si1153 proceeds
directly from the Off Mode to the Initialization Mode.
4.2 Initialization Mode
When power is applied to VDD and is greater than the minimum VDD Supply Voltage stated in the electrical specification table, the
Si1153 enters its Initialization Mode. In the Initialization Mode, the Si1153 performs its initial startup sequence. Since the I2C may not
yet be active, it is recommended that no I2C activity occur during this brief Initialization Mode period. The “Start-up time” specification in
the electrical specification table is the minimum recommended time the host needs to wait before sending any I2C accesses following a
power-up sequence. After Initialization Mode has completed, the Si1153 enters Standby Mode. During the Initialization mode, the I2C
address selection is made according to whether LED2 is pulled up or down.
4.3 Standby Mode
The Si1153 spends most of its time in Standby Mode. After the Si1153 completes the Initialization Mode sequence, it enters Standby
Mode. While in Standby Mode, the Si1153 does not perform any Ambient Light measurements or Proximity Detection functions. Howev-
er, the I2C interface is active and ready to accept reads and writes to the Si1153 registers. The internal Digital Sequence Controller is in
its sleep state and does not draw much power. In addition, the INT output retains its state until it is cleared by the host.
I2C accesses do not necessarily cause the Si1153 to exit the Standby Mode. For example, reading Si1153 registers is accomplished
without needing the Digital Sequence Controller to wake from its sleep state.
4.4 Forced Conversion Mode
The Si1153 can operate in Forced Conversion Mode under the specific command of the host processor. The Forced Conversion Mode
is entered when the FORCE command is sent. Upon completion of the conversion, the Si1153 can generate an interrupt to the host if
the corresponding interrupt is enabled. It is possible to initiate both a proximity and ALS measurement.
4.5 Automated Operation Mode
The Si1153 can be placed in the Autonomous Operation Mode where measurements are performed automatically without requiring an
explicit host command for every measurement. The START command is used to place the Si1153 in the Autonomous Operation Mode.
The Si1153 updates the I2C registers for proximity and ALS automatically. The host can also choose to be notified when these new
measurements are available by enabling interrupts. The conversion frequency for autonomous operation is set up by the host prior to
the START command.
The Si1153 can also interrupt the host when the proximity or ALS measurement reach a pre-set threshold. To assist in the handling of
interrupts the registers are arranged so that the interrupt handler can perform an I2C burst read operation to read the necessary regis-
ters, beginning with the interrupt status register, and cycle through the various output registers.
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Rev. 0.9 | 10
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet SI1153.PDF ] | |
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