MX23L4005

From WiiBrew
Jump to navigation Jump to search

The custom MX23L4005 chip used on the Nintendo Wii contains the GameCube font set, RTC, and power management functions. It is listed on WiiRe as "U8: MX "E062674-MG" "MX23L4005-24C1" "RTC-RVL A" "2S08802" (RTC, TSOP28 18x8mm)".

Die shot: http://www.bunniestudios.com/blog/?p=227

Observed pin behavior:

1 connected to power button - active high (measures +3.3v while power button is pressed)
2 wii power state (+3.3v when power is on or in standby, 0v otherwise) TP113 comes on slightly after pin 3
3 wii power state (+3.3v when power is on or in standby, 0v otherwise)
4 Gnd
5 0? TP46 pulses occasionally to 1
6 1? TP106
7 0? TP45

8 0?  measuring this pin prevents the wii from shutting off when you hold the power button down ?!!?
9 nc?
10 TP109 0?
11 TP43 0?
12 TP44 exi?
13 TP41 exi?
14 TP42 exi?

15 exi?
16 Gnd
17 3.3v when wii has power applied
18 3.3v when wii has power applied
19 TP108 measuring this causes wii to power on immediately
20 TP231 0? 
21 TP110 3.3v when wii has power applied, goes low briefly when powering off

22 xtal
23 xtal
24 TP119 turns on shortly after poweron
25 TP117 +3.3v when wii has power
26 TP116 0?
27 +3.3v when wii has power
28 0?