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	0.00	0.0	RD10	01	40	RD0	3.7	1.15	0.15
RF0	0.01	0.1	RD9	02	39	RD11	3.6	1.14	0.14
RD7	0.02	0.2	RD8	03	38	RD1	3.5	1.13	0.13
RD6	0.03	0.3	RF8	04	37	RD2	3.4	1.12	0.12
RD13	0.04	0.4	RF2	05	36	RD3	3.3	1.11	0.11
0.00	0.05	0.5	RF5	06	35	RD4	3.2	1.10	0.10
0.01	0.06	0.6	RF4	07	34	RD5	3.1	1.09	0.09
0.02	0.07	0.7	RD15	08	33	RG14	3.0	1.08	0.08
0.03	0.08	1.0	RD14	09	32	RG12	2.7	1.07	0.07
0.04	0.09	1.1	RA1	10	31	RG13	2.6	1.06	0.06
	0.10	1.2	RA15	11	30	RG15	2.5	1.05	0.05
	0.11	1.3	RA14	12	29	RE7	2.4	1.04
	0.12	1.4	RE0	13	28	RE6	2.3	1.03
	0.13	1.5	RE1	14	27	RE5	2.2	1.02
	0.14	1.6	RE2	15	26	RE4	2.1	1.01
	0.15	1.7	RE9	16	25	RE3	2.0	1.00
			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.