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SFH7773 Datasheet(PDF) 7 Page - OSRAM GmbH |
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SFH7773 Datasheet(HTML) 7 Page - OSRAM GmbH |
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7 / 23 page  ambient light levels. Fig. 13 demonstrates this outstanding feature. Even in environments of 50 klx the proximity signal is completely unaffected (refer to Fig. 13) by even illumination with a halogen lamp which contains a high level of IR radiation. 6. Current Consumption The following equations give an idea on the total power consumption of the SFH 7773 during operation. By operating the PS in the free-running mode, the current consumption (including LED current, ILED) can be approximated by the following Eq. (depending on the measurement interval time trep_PS and the PS integration time tburst): () PS rep LED burst PS AVG t mA I t I _ _ 100 5 . 0 + ⋅ = Eq. (2) The current consumption during operation of the ALS depends on the ALS integration time tint as well as the repletion time trep_ALS can be approximated by: ALS rep ALS AVG t t mA I _ int _ 1 ⋅ = Eq. (3) Example for total PS current consumption: ILED = 100 mA, tburst = 300 us and trep = 100 ms => IAVG_PS = 300 μA. This compares to a stand-by current consumption of less than 5 μA (typ. 2-3 μA). 7. Operating Modes The SFH 7773 can be operated in three different modes, in which the proximity resp. the ambient light function can be used independently from each other. The three basic modes are: Mode Bit Rate Standard mode (Sm) ≤ 100 kbit/s Fast mode (Fm) ≤ 400 kbit/s High speed mode (Hs) ≤ 3.4 Mbit/s Tab. 3: The I 2C-bus protocol speed mode compatibility of the SFH 7773. free-running: The sensor measures continuously and writes the results into the relevant registers, ready to be read via the I2C-bus interface. Optionally the interrupt alert function with the user-defined threshold levels (PS and/or ALS) will be executed if such an event takes place. triggered: The measurements are initiated via I2C-bus instruction. Data are available after processing is finished (10 ms total delay time for PS, 100 ms for ALS). stand-by: The initial state after power-up. The SFH 7773 is in low power mode (IDD < 5 μA), no operations are carried out, but the device is ready to respond to I2C-bus commands. additionally, there is the off-state: off: The SFH 7773 is inactive, supply current is below 2 μA. The SDA, SCL and INT pins are in Z-state (high impedance). All register entries are reset to the default values. The transition time between the modes, ttrans, is < 10 ms. The delay time between standby and start of measurement is < 10 ms. The voltage VDD to switch the SFH 7773 into the off-state is < 1.4 V. To reach the stand-by mode at least 2.0 V are required. 8. I 2C – Bus Communication The address of the SFH 7773 is 0x38. 8.1 I²C - Bus Environment The SFH 7773 is a digital ambient light and proximity sensor. The communication is performed via a 2-wire I²C bus interface, so the device can be integrated into a typical multi-master / multi-slave I²C bus environment. A typical I²C bus network consists of a master and different I²C bus slave devices. For a more detailed discussion on the topic of I2C-bus please refer to [2]. December 12, 2011 page 7 of 23 |
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