The "Touch 'n Go" card was first introduced in Malaysia in 1997 is an electronic payment system using Philips MIFARE system. The card is not only used in toll payment but also widely used in parking and public transportation system. Soon enough an on board vehicle device toll collection SmartTAG - acronym in Malay Sistem Membayar Automatik Rangkaian Tol or "Toll Network Automatic Payment System" was introduced to complement with Touch 'n Go card. SmartTAG was designed, developed and manufactured by Teras Teknologi Sdn Bhd, a local company and with the intellectual property rights by an Austrian company known as EFKON Gmbh. The main function of the SmartTag is to relay data between the card and toll system using infrared technology.
Taking the SmartTAG device apart is pretty straightforward. Just removing the battery cap and one Philip screw head will separate the casing. Basically there are three main electronics parts: main board, pick-up coil and the liquid crystal display. In order to to have a better view of the main board, I will need to desolder the 6-pin header connector from the pick-up coil board.
|Top casing removed reveals the mainboard. This side consist of the main controller and Infrared LEDs|
|The pickup coil PCB is located at reverse side of the mainboard|
|Desoldering the connector in order to remove the pickup coil PCB|
|The reverse side of the board with metal shielding after removing the secondary PCB.|
The shield is to minimize interference from the magnetic coil flux.
I google up the parts used and finding difficulty to identify the two main IC. Can you guess what are they? Microcontroller? Power Management IC? Also never seen before SMD type IR receiver with a flat surface. High possibility customized LED parts.