Model

ELM327 Chip

TDA60

TDA61

TDA66

AT command

Basic ELM327 

CMD

Basic ELM327

CMD

Advanced AT 

CMD

Advanced AT 

CMD

The basic ELM37 instructions

The basic ELM37 instructions

The basic ELM327 commands and compatible extends several free instruction

Support user-

defined CMD

Support Multi-

line CMD

Core

8 Bit MCU

8 Bit MCU

8 Bit MCU

ARM 32-bit Cortex™-

M3 CPU

MIPS

20MHZ

20MHZ

20MHZ

100 MHz 

maximum frequency,
1.25 DMIPS/MHz 

(Low power consumption)

Include the whole moudle

No--Around 1W

No--Around 1W

Yes--<1W 

Yes --<0.6W 

 Multiple peripheral circuit

No

No

Yes

Yes

Doze mode

No

No

No

Yes--<0.01W

Specified Acess

No

Yes

Yes

Yes

Communications interfaces

Uart RS232

Uart RS232 

Uart RS232 

Uart RS232
I2C
SPI

Embedded Communication 

Module 

support

No

No

No

Yes 

Bluetooth HCI layer
Wifi Link Layer

GSM Module

Library

No

No

No

Open Library for 

ARM-M3

Firmware Update

No

No

Yes

Yes

Auto Protocols

No

Yes

Yes

Yes

Packaging

SOP 28--Big size

SOP 28--Big size, 
Pin to pin with Original ELM327

SSOP 28--Smaller size

WLCSP-Smallest Size4 x 4mm
LQFP--smaller size
LFBGA--smaller size

Specification