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Zone Boundary 3

Zone Boundary 2

Zone Boundary 1

Zone Boundary 0

VZB3 +

VHYST

VZB3 -

VHYST

VZB2 +

VHYST

VZB2 -

VHYST

VZB1 +

VHYST

VZB0+

VHYST

VZB0 -

VHYST

VZB1 -

VHYST

Zone 4

Zone 3

Zone 2

Zone 1

Zone 0

LM3530

SNVS606L – JUNE 2009 – REVISED DECEMBER 2014

www.ti.com

Figure 32. Zone Boundaries With Hysteresis

8.3.8

Minimum Zone Boundary Settings

The actual minimum zone boundary setting is code 0x03. Codes of 0x00, 0x01, and 0x02 are all mapped to code

0x03. Table 1 shows the Zone Boundary codes 0x00 through 0x04, the typical thresholds, and the high and low

hysteresis values. The remapping of codes 0x00 - 0x02 plus the additional 4mV of offset voltage is necessary to

prevent random offsets and noise on the ALS inputs from creating threshold levels that are below GND. This

essentially guarantees that any Zone Boundary threshold selected is achievable with positive ALS voltages.

Table 1. Ideal Zone Boundary Settings with Hysteresis (Lower 5 Codes)

ZONE BOUNDARY CODE

TYPICAL ZONE BOUNDARY

TYPICAL THRESHOLD +

TYPICAL THRESHOLD -

THRESHOLD (mV)

HYSTERESIS (mV)

0x00

15.8

19.3

12.3

0x01

15.8

19.3

12.3

0x02

15.8

19.3

12.3

0x03

15.8

19.3

12.3

0x04

19.7

23.2

16.2

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