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PDF MAX44004 Data sheet ( Hoja de datos )
| Número de pieza | MAX44004 | |
| Descripción | Digital Ambient Light Sensor | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX44004 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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19-5997; Rev 0; 5/12
EVALUATION KIT AVAILABLE
MAX44004
Digital Ambient Light Sensor
General Description
The MAX44004 is a wide dynamic range, low-
power ambient light sensor (ALS) ideal for many light
sensing applications: tablets, displays, accessories,
medical devices, and light management systems.
The on-chip ambient sensor has the power to measure
the exact visible light from 0.03 lux to 65,000 lux and com-
municate through an I2C digital communication bus. The
IC has patented sensors, filters, and circuitry to mimic the
human eye response. With on-chip calibration registers,
it performs the same in different light conditions (i.e., fluo-
rescent, incandescent). The interrupt pin minimizes the
need of constant polling of the device, freeing up micro-
controller resources for efficient communication and thus
reducing overall power consumption. The part-to-part
matching is optimized by proprietary Maxim process to
speed up end-product development time.
The IC can operate from a VDD of 1.7V to 3.6V, including
both supply and I2C times. It consumes just 5µA operat-
ing current.
Applications
Tablets and Netbooks
Displays, TVs, Projectors
Digital Lighting Management
Medical Devices
Industrial Automation
Benefits and Features
S Consumes Low Power
5µA Supply Current
Interrupt Pin Delivers Efficient Communication
S High Sensitivity
0.03 Lux Sensitivity
S Easy to Design
1.7V to 3.6V Supply Voltage
Tight Part-to-Part Variation
S Reliable Light Sensing
Perfect Rejection of 50Hz/60Hz Noise
Adjustable Visible and Infrared Sensor Gain
S Tiny, 2mm x 2mm x 0.6mm OTDFN Package
S -40°C to +105°C Temperature Range
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to www.maxim-ic.com/MAX44004.related.
Typical Application Circuit
VDD
VDD
VIS + IR
(ALS)
IR (ALS)
ALS
PGA
14-BIT
SDA
MAX44004
I2C
SCL
MICRO-
CONTROLLER
ALS
PGA
14-BIT
INT
GND A0 GND
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
MAX44004
Digital Ambient Light Sensor
Pin Configuration
TOP VIEW
VDD 1
+
GND 2
MAX44004
6 SDA
5 SCL
A0 3
EP 4 INT
Pin Description
PIN NAME
FUNCTION
1 VDD Power Supply
2
GND
Ground
3 A0 Address Select
4 INT Active-Low Interrupt
5 SCL I2C Clock
6
SDA
I2C Data
— EP Exposed Pad. EP is internally connected to GND. EP must be connected to GND.
5
5 Page 
MAX44004
Digital Ambient Light Sensor
ALS Interrupt Threshold Registers
(0x06-0x09)
ALS Interrupt Threshold registers (0x06-0x09) are
explained in Table 13.
The ALS upper threshold and ALS lower threshold
(UPTHR[13:0] and LOTHR[13:0]) set the window limits
that are used to trigger an ALS interrupt. It is important
to set these values according to the selected bit resolu-
tion/integration time chosen for the ALS measurement
based on the ALSTIM[1:0] and ALSPGA[1:0] settings.
The upper 2 bits are always ignored. If the INTE bit is set,
and the lux level is greater or lower than the respective
thresholds for a period greater than that defined by the
ALSPST persist time, the INTS bit in the Status register
are set and the INT pin is pulled low.
Threshold Persist Timer Register (0x0A)
The MAX44004 incorporates a persist function that allows
users to set the number of consecutive triggers before inter-
rupt. The Threshold Persist Timer register is explained in
Table 14.
ALSPST[1:0] sets one of four persist values that controls
how readily the interrupt logic reacts to a detected event.
This feature is useful in reducing false or nuisance interrupts
due to optical noise/minor disturbances. See Table 15.
When ALSPST[1:0] is set to 00, and the ALSINTE bit is set
to 1, the first time an ALS interrupt event is detected, the
ALSINTE interrupt bit is set and the INT pin goes low. If
ALSPST[1:0] is set to 01, then four consecutive interrupt
events must be detected on four consecutive measure-
ment cycles. Similarly, if ALSPST[1:0] is set to 10 or 11,
then 8 or 16 consecutive interrupts must be detected
before the INT pin is pulled low. If there is an intervening
measurement cycle where no interrupt is detected, then
the count is reset to zero.
Digital Gain Trim Registers (0x0F, 0x10)
Digital gain trim registers are described in Table 16.
TRIM_GAIN_GREEN [6:0] is used to modify the gain of
the green channel.
TRIM_GAIN_IR [8:0] is used to modify the gain of the IR
channel.
To tell the part to use the values written to this register,
set the TRIMB bit to 0 in the Main Configuration register
after writing new values to these registers.
Table 14. Threshold Persist Timer Register (0x0A)
REGISTER
BIT7
Threshold Persist Timer
Table 15. APSPT [1:0]
ALSPST[1:0]
00
01
10
11
BIT6
BIT5
BIT4 BIT3 BIT2 BIT1 BIT0
ALSPST[1:0]
REGISTER
ADDRESS
0x0A
POWER-
ON RESET
STATE
0x00
NO. OF CONSECUTIVE TRIGGERS BEFORE AN INTERRUPT
1
2
4
16
R/W
R/W
Table 16. Digital Gain Trim Registers (0x0F, 0x10)
REGISTER
BIT7 BIT6 BIT5 BIT4 BIT3 BIT2 BIT1
BIT0
REGISTER
ADDRESS
POWER-
ON RESET
STATE
R/W
Digital Gain Trim of
Green Channel
TRIM _GAIN_GREEN [6:0]
TRIM_GAIN_IR
0x0F
0x80
R/TW
Digital Gain Trim of
Infrared Channel
TRIM _GAIN_IR [8:1]
0x10
0x80
R/TW
Note 1: Values read from the Trim_Gain registers are the complement of the written value. This is true for reading both the factory-
programmed values and the customer-programmed values.
11
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| PDF Descargar | [ Datasheet MAX44004.PDF ] | |
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