LM3533 Datasheet, PDF (20/53 Pages) Texas Instruments – Complete Lighting Power Solution for Smartphone Handsets

LM3533
FIGURE 6. ALS Zone Boundary + Hysteresis
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Note: The arrows indicate the direction of the ALS voltage.
ZONE TARGET REGISTERS (ALSM1, ALSM2, ALSM3)
For each brightness zone there is a programmable brightness target which is set via the ALS Zone Target Registers (see Table
31, Table 32, and Table 33). There are 3 sets of ALS Zone Target Registers (ALSM1, ALSM2, and ALSM3). The ALSM1 Zone
Target Registers are dedicated to only Control Bank 1. ALSM2 and ALSM3 registers can be assigned to any of the Control Banks
(B – F) (see Table 8 and Table 10). Each of the Zone Target Registers consists of an 8-bit code which is a percentage of the
programmed full-scale current. This percentage of full-scale current is dependent on the selected mapping mode. Figure 7 details
the mapping of the ALS Brightness Zone to the ALSM_ Zone Target Registers.
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