AX88196BLF datasheet(84/86 Pages) ASIX

Part #	AX88196BLF

Description	Low-pin-count Non-PCI 8/16-bit 10/100M Fast Ethernet Controller with MII Interface

PDF	86 Pages

Scroll/Zoom	100%

Manufacturer	ASIX [ASIX Electronics Corporation]

Direct Link	http://www.asix.com.tw

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84 / 86 page

ASIX ELECTRONICS CORPORATION

AX88196BLF

Appendix B: Disable AX88196B voltage regulator

AX88196B 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 AX88196B voltage regulator and use the existing

1.8V power source (probably a higher efficiency version). In that case, user can connect VCC3R3 (pin-14) and

GND3R3 (pin-15) to ground, keep V18F (pin-13) open, and set REGSTB bit of PMR register (Page3 Offset 0BH)

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 AX88196B,

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

current.

AX88196B

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”

AX88196BLF Datasheet(PDF) 84 Page - ASIX Electronics Corporation