LM3532TMX-40ANOPB National Semiconductor Corporation, LM3532TMX-40ANOPB Datasheet - Page 17

• Manufacturer Part Number: LM3532TMX-40ANOPB
• Description: High Efficiency White Led Driver With Programmable Ambient Light Sensing Capability And I2c-compatible Interface
• Manufacturer: National Semiconductor Corporation

AMBIENT LIGHT ZONE HYSTERESIS
For each Zone Boundary there are two Zone Boundary Reg-
isters: a Zone Boundary High Register and a Zone Boundary
Low Register. The difference between the Zone Boundary
High and Zone Boundary Low Register set points (for a spe-
cific zone) creates the hysteresis that is required to transition
FIGURE 5. Ambient Light Input to Backlight Mapping
FIGURE 6. ALS Zone Boundaries + Hysteresis
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between two adjacent zones. This hysteresis prevents the
backlight current from oscillating between zones when the
ALS voltage is close to a Zone Boundary Threshold.
6
cate the direction of the ALS input voltage. The black dots
indicate the threshold used when transitioning to a new zone.
describes this Zone Boundary Hysteresis. The arrows indi-
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Figure