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Monterey AUM6868

Overview

AUM6868 is a keyboard encoder chip found in some Monterey keyboards. The manufacturer and the derivation of the model number are not known. The pinout to the chip was provided during FCC product registration and is found in the K290 FCC test report. The chart for this chip shows it labelled simply “MONTEREY AUM6868”. Considering that this chip is from 1995, it is most likely going to be a microcontroller-based encoder.

Pinout

Pin Designation Function
1 GND
2
3 DATA PS/2 data
4 CLK PS/2 clock
5 P30 Matrix connection S16
6 P31 Matrix connection S17
7–10
11–18 P01–P07 Matrix connections S0–S7
19–26 P10–P17 Matrix connections S8–S15
27–34 P20–P27 Matrix connections R0–R7
35 LED0 Fed from VCC via scroll lock LED
36 LED1 Fed from VCC via num lock LED
37 LED2 Fed from VCC via caps lock LED
38 VOO Stabilised VCC via a 4.7 kΩ resistor (R2), C1 (104) and C2 (10 µF) to ground (pin 1)
39 R_OSC Fed from VCC via 47 kΩ resistor (R1)
40

Keyboards

Documentation