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PDF STK3171-018 Data sheet ( Hoja de datos )
| Número de pieza | STK3171-018 | |
| Descripción | Integrated Ambient Light Sensor and Proximity Sensor | |
| Fabricantes | Sitronix | |
| Logotipo |  |
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Sitronix
STK3171-018
Integrated Ambient Light Sensor and Proximity Sensor with Built-in IR-LED
DATA SHEET
Version : 1.07
Dated : 2012-05-11
Date
20120511
2012.04.18
2012.03.27
2012.03.09
2012.02.17
2012.01.13
2011.12.27
2011.12.22
2011.12.01
2011.10.28
2011.10.13
2011.10.03
Version
1.07
1.06
1.05
1.04
1.03
1.02
1.01
0.9
0.8
0.7
0.6
0.5
Modified Items
Increase ALS Dynamic Range.
Increase I2C sequential Read Diagram.
Increase SW Reset register, and SW-Reset request.
Modify PS Interrupt State Diagram and add description of
register 0x08 bit 0
Modify Package Diagram.
Add View Angle Response of PS
Modify I2C ACK Diagram (from H to L) to match IC design
Add PS Interrupt State Diagram
New Released
Add PCB Pad Layout Guideline
Add Package Information
Modify Application Circuit
Modify Pin-out Diagram
Add Package Outline Diagram
Initial Draft
publisher
Lucas
Lucas
Lucas
YL
Lucas
YL
YL
YL
YL
YL
YL
YL
Note! Information provided within this document is subject to change without notice.
Sitronix reserves the right to change the product design without notice to its users.
SEVIC Confidential
0
No Disclosure
1 page  
4. PIN DESCRIPTION
Pin No.
1
2
3
4
5
6
7
8
Pin Name
SDA
/INT
LDR
LEDK
LEDA
GND
SCL
VDD
Dir. Pin Function
B I2C serial data line.
O Interrupt pin, LO for interrupt alarming. The INT pin is an open drain.
I
IR LED driver pin connecting to the cathode of the external IR LED.
The sink current of the IR LED driver can be programmed through I2C or the external resistor.
O Cathode of the embedded IR LED, connect to LDR pin
I Anode of the embedded IR LED, connect to power.
GND Ground. The thermal pad is also connected to the GND pin.
I I2C serial clock line.
PWR Power supply: 2.5V to 3.6V.
Direction denotation:
O
I
PWR
Output
Input
Power
GND
B
NC
Ground
Bi-direction
Not Connect
Sitronix
4
5 Page 
PS Command Register (09 hex)
1. Interrupt Control; Bit 7. This bit is used to control the interrupt mode.
BIT 7
0
1
OPERATION
Set /INT pin low if FLG_ALS or FLG_PS high (logical
OR)
Set /INT pin low if FLG_ALS and FLG_PS high (logical
AND)
2. PS sleep time (SLP_PS): Bit 6, and 5. The proximity sleep time between IR LED pulses can be adjusted via I2C.
The following table lists the possible values of SLP_PS.
BITS 6:5
00
01
10
11
PROXIMITY SLEEP TIME
10ms; sleep time between IR LED pulses is 10ms
30ms; sleep time between IR LED pulses is 30ms
90ms; sleep time between IR LED pulses is 90ms
270ms; sleep time between IR LED pulses is 270ms
3. Amplitude of IR LED sinking current: Bit 4. This device provides current source to sink an external IR LED. The sink
current can be programmed through IRDR_PS.
BIT 4
0
1
IRDR PIN SINK CURRENT
100mA current sink
200mA current sink
4. IT_PS: Bit 3 and 2. The STK3171-018 fundamental refresh timing of PS can be tuned by IT_PS. To cooperate with
the PS command register, (IT1_PS :IT0_PS), the designer has a very wide rang and flexible way to choose a refresh
time for the system programming demand. In following table, STK3171-018 fundamental refresh timing, (IT1_PS :
IT0_PS) → (0 : 0) =x1, is 1T, i.e. 0.2ms. The other related refresh timing in the table are all changed by comparing
with the fundamental timing. As the example in following table, it is below showing the timing table that the system
designer can have a flexible way for choosing the desired fresh timing to STK3171-018.
BITS 3:2
RELATIVE REFRESH TIMING
REFRESH TIMING TABLE (Example)
00 1 T
0.2ms
01 1.5 T
0.3ms
10 2 T
0.4ms
11 2.5 T
0.5ms
Refresh Timing Table for PS
And the duty of the IR LED driving current can be calculated by following formula:
Duty(%) =
IT _ PS
×100
IT _ PS × 2 + SLP _ PS
5. INT_PS: Bit 1. INT_PS = 0, disable PS interrupt. INT_PS = 1, enable PS interrupt.
BIT 1
OPERATION
0 PS INT Disable
1 PS INT Enable
6. SD_PS: Bit 0. SD_PS = 0, enable PS. SD_PS = 1, disable PS.
BIT 0
OPERATION
0 PS SD Enable
1 PS SD Disable
Sitronix
10
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| PDF Descargar | [ Datasheet STK3171-018.PDF ] | |
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