---
title: "About the resistance of RSET_BG"
url: "https://maker.wiznet.io/forum/13762"
markdown_url: "https://maker.wiznet.io/forum/13762/md"
type: "Forum topic"
category: "Ethernet Chips"
author: "fukuda2"
created: "2020-03-31T04:17:15+09:00"
last_activity: "2020-04-07T04:52:06+09:00"
language: "en"
views: 415
replies: 2
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# About the resistance of RSET_BG

## Question

Asked by fukuda2 on 2020-03-31 in Ethernet Chips.

Hi.
I’m evaluating a pcb board with W5300 chip.
What is the function of the pull-down resistor of RSET_BG?
What happens if it is not 12.3kΩ?
Thank you.

## Replies

### Reply 1 by scott, 2020-04-02

You must use 12.3 k.

The resistor is not a pull-down.

A resistor that limits the current of a chip’s internal element.

Thank you

### Reply 2 by fukuda2, 2020-04-07 (in reply to reply 1)

Thank you for reply.
If the resistor value is not 12.3k, will the chip fail?
Thank you.

---

Source: https://maker.wiznet.io/forum/13762