AX88796BLF datasheet(80/82 Pages) ASIX

tên linh kiện	AX88796BLF

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ASIX ELECTRONICS CORPORATION

AX88796BLF / AX88796BLI

Appendix B: Disable AX88796B voltage regulator

AX88796B integrates an on-chip 3.3V to 1.8V voltage regulator for single-power supply system design. If the

system have 1.8V power source already, user may like to disable AX88796B voltage regulator and use the existing

1.8V power source (probably a higher efficiency version). In that case, user can connect VCC3R3 (pin-10) and

GND3R3 (pin-11) to ground, keep V18F (pin-9) open, and set REGSTB bit of PMR register (see Page3 Offset 0BH

bit-4 in section 5.1.56 Power Management Register (PMR)) to 0 (i.e. logic "low") to avoid the leakage current.

Please refer to below picture for details.

Note: If user connects the VCC3R3 to 3.3V VCC and wants to disable the internal voltage regulator of AX88796B,

the REGSTB bit of PMR register should be set to 1 to set the regulator in standby mode to reduce the leakage

current.

AX88796B

V18F

REGSTB

VCC18A

VCCK

VCC3R3

GND3R3

Keep NC without loading

Supply Analog 1.8V from existing power

source on system

Supply Digital 1.8V from existing power source

on system

Logic “low”

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