WACOM W6005S Tablet RX Analog Front End ASIC

This is an analog front end ASIC used in the early WACOM ArtPad and Intuos series tablets. It contains a programmable gain amplifier (PGA), two mixers, and two integrators (opamps with the positive input tied to VREF) to perform the quadrature demodulation of the FM signal received from the pen. The integration capacitors and reset switches are external to the chip.

Intuos 3:

W6005S

Pinout

Pin Name Description
1 VCNT Gain control
2 GND Ground
3 VREF Internal reference voltage, 1/2 VDD
4 VCC Supply
5 MOE Mixer output enable
6 MIN1 Mixer 1 input
7 MC1 Mixer 1 clock
8 MOUT1 Mixer 1 output
9 SIN1 Integrator 1 input
10 SOUT1 Integrator 1 output
11 SOUT2 Integrator 2 output
12 SIN2 Integrator 2 input
13 MOUT2 Mixer 2 output
14 MC2 Mixer clock 2
15 MIN2 Mixer 2 input
16 FOUT Unknown, connected to FIN
17 FIN Unknown, connected to FOUT
18 VOUT PGA output
19 VIN- PGA input -
20 VIN+ PGA input +

References