TL866 II PLUS

The TL866 II PLUS is NOT compatible with the TL866 A / TL866 CS models. The microcontroller has been changed from a PIC18 to a PIC24F and there are other significant schematic changes. The plastic enclosure for the TL866 II PLUS is identical to the TL866A / TL866CS.

Hardware

The TL866II PLUS is driven by a Microchip PIC24FJ256GB110 microcontroller which connects directly to the USB.

Reverse-Engineered Schematic

Pinouts

ZIF40 Pinout

VPP	VDD	GND	01	40	GND	VDD	VPP
VPP	VDD	GND	02	39	GND	VDD	VPP
VPP	VDD	GND	03	38	GND	VDD	VPP
VPP	VDD	GND	04	37	GND	VDD	VPP
VPP	VDD	GND	05	36	GND	VDD	VPP
VPP	VDD	GND	06	35	GND	VDD	VPP
VPP	VDD	GND	07	34	GND	VDD	VPP
VPP	VDD	GND	08	33	GND	VDD	VPP
VPP	VDD	GND	09	32	GND	VDD	VPP
VPP	VDD	GND	10	31	GND	VDD	VPP
	VDD	GND	11	30	GND	VDD	VPP
	VDD	GND	12	29	GND	VDD
	VDD	GND	13	28	GND	VDD
	VDD	GND	14	27	GND	VDD
	VDD	GND	15	26	GND	VDD
	VDD	GND	16	25	GND	VDD
			17	24
			18	23
			19	22
		GND	20	21	GND

The primary interface to the target device is a 40 pin ZIF (zero insertion force) socket. Digital IO at LVCMOS3.3 levels is supported direct to the MCU on every pin. Inputs above +3.3V will be clamped. The V_DD bus can be switched to pins 1-16 and 25-40. The V_PP bus can be switched to pins 1-10 and 30-40. The ground bus can be switched to pins 1-16, 20, 21, and 25-40.

Original research

• TL866_II_PLUS/Bootloader

Photos

TL866 II PLUS photos

Photos of a TL866 II PLUS bought April 2018 from eBay seller goldenchipset.
Red and yellow LEDs were desoldered from mainboard to allow separation of the two PCBs.