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LM36011 Datasheet(PDF) 10 Page - Texas Instruments |
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LM36011 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 26 page STROBE ILED TIME-OUT Start TIME-OUT Reached VOUT goes low, LED turn off STROBE ILED 10 LM36011 SNVSAN5 – JULY 2017 www.ti.com Product Folder Links: LM36011 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated 7.3 Feature Description 7.3.1 Flash Mode In flash mode, the LED current source provides 128 target current levels from 11 mA to 1.5 A, set by the LED Flash Brightness Register (0x03 bits [6:0]). Flash mode is activated by the Enable Register (0x01), setting mode M1, M0 (bits [1:0]) to 11. Once the flash sequence is activated, the LED current source ramps up to the programmed flash current by stepping through all current steps until the programmed current is reached. When flash mode is enabled using the mode M1, M0 (bits [1:0]) of the Enable Register (0x01), the mode bits in the Enable Register are cleared after a flash time-out event. 7.3.2 Torch Mode In torch mode, the LED current source provides 128 target current levels from 2.4 mA to 376 mA, set by the LED Torch Brightness Register (0x04 bits [6:0]). Torch mode is activated by the Enable Register (0x01), setting mode M1, M0 (bits [1:0]) to 10. Once the TORCH sequence is activated, the LED current source ramps up to the programmed torch current by stepping through all current steps until the programmed current is reached. The rate at which the current ramps is determined by the value chosen in the Torch Ramp bit [0] in Timing Register (0x02). 7.3.3 IR Mode In IR mode, the target LED current is equal to the value stored in the LED Flash Brightness Register (0x03 bits [7:0]). IR mode is enabled by the Enable Register (0x01) setting mode M1, M0 (bits [1:0]) to 01. In IR mode, toggling the STROBE pin enables and disables the LED current source. The STROBE pin can only be set to be Level sensitive, as all timing of the IR pulse is externally controlled. In IR mode, the current source does not control the ramp rate of the LED output. The current transitions immediately from off to on and then on to off. Figure 17. IR Mode (1) When the flash timer elapses, the device goes into stand-by regardless of strobe state Figure 18. IR Mode Time-out |
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