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	IO			IO	GND	VDD	VPP
RF1	VDD	GND	RD10	01	40	RD0	GND	VDD	VPP
RF0	VDD	GND	RD9	02	39	RD11	GND	VDD	VPP
RD7	VDD	GND	RD8	03	38	RD1	GND	VDD	VPP
RD6	VDD	GND	RF8	04	37	RD2	GND	VDD	VPP
RD13	VDD	GND	RF2	05	36	RD3	GND	VDD	VPP
VPP	VDD	GND	RF5	06	35	RD4	GND	VDD	VPP
VPP	VDD	GND	RF4	07	34	RD5	GND	VDD	VPP
VPP	VDD	GND	RD15	08	33	RG14	GND	VDD	VPP
VPP	VDD	GND	RD14	09	32	RG12	GND	VDD	VPP
VPP	VDD	GND	RA1	10	31	RG13	GND	VDD	VPP
	VDD	GND	RA15	11	30	RG15	GND	VDD	VPP
	VDD	GND	RA14	12	29	RE7	GND	VDD
	VDD	GND	RE0	13	28	RE6	GND	VDD
	VDD	GND	RE1	14	27	RE5	GND	VDD
	VDD	GND	RE2	15	26	RE4	GND	VDD
	VDD	GND	RE9	16	25	RE3	GND	VDD
			RE8	17	24	RD12
			RF12	18	23	RA5
			RF13	19	22	RA4
		RB2	RA2	20	21	RA3	RB3

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.