PRODUCT DESCRIPTION
The MB89R118C is a vicinity type of RFID LSI device embedded with 2 Kbytes FeRAM, which enables fast and frequent write operation.
PRODUCT FEATURES
FeRAM embedded RFID LSI“MB89R118C”for 13.56MHz has specific features; Large memory capacity, Radiation hardness, and Large input capacitance for small antenna.
This product consists of three parts ; RF (Analog), Logic, and Memory. 2Kbytes FRAM is embedded as data memory and the communication specification is based on ISO/ IEC15693, which defines protocols and commands for vicinity type of passive RFID powered by RF.
The main features of this product are as follows :
- Memory capacity of 2 Kbytes FeRAM (including 2000 bytes of user area)
- 8-byte/block configuration, 256 blocks
- High-speed data transmission at 26.48 kbps
- Fast command supported (data transmission at 52.97 kbps) (Transponder Reader/Writer)
- Carrier frequency at 13.56 MHz
- Anti-collision function : 30 tags per second
- Read/Write endurance : 1 trillion times
- Data retention period: 10 years ( + 85 ℃) , 30 years (+70 ℃)
- 64-bit UID
- FeRAM memory data protection
- Electronic article surveillance (EAS) command
- Transmission protocol based on ISO/IEC 15693, ISO/IEC18000-3 (Mode 1)
Radiation-hardness of FRAM embedded RFID
“MB89R118C”is a RFID LSI for HF (13.56MHz) embedded with 2Kbytes FRAM, which is suitable for industrial applications such as FA because of the large memory capacity for data carrier tag.
“MB89R118C” is the successor of “MB89R118/118B,” which is already distributed in the RFID market, and the specification of “MB89R118C” follows the existing two products.
Therefore, the customers who already use either of the two products can adapt “MB89R118C”to the current environment without any modification.
Also from the physical size point of view, small tags are preferred for some products, on which the tag is attached. And if the number of antenna turns is not sufficient due to the size limitation, the communication performance would be deteriorated.
This is the reason why “MB89R118C” has prepared 96pF input capacitance version in addition to 24pF version, and this feature enables to decrease the number of antenna turns for small size of tags.
Product Specifications
■ Memory configuration
2Kbytes FRAM is embedded as internal memory, which consists of 2,000bytes user area and 48bytes system area. The user area consists of 250 blocks from “00H”to “F9H” and the system area consists of 6 blocks from “FAH”to“FFH.”Each block stores 8bytes of data.
■ Data transmission
From Reader/Writer to RFID
The communication between Reader/Writer and RFID is based on the protocol defined in ISO/IEC15693. The data transmitted from Reader/Writer is modulated by ASK (Amplitude Shift Keying), and the modulation index is 10％ and 100％ . The data coding of “MB89R118C” is “1 out of 4”coding, and “1 out of 256”coding is not implemented.
From RFID to Reader/Writer
The data responded from RFID to Reader/Writer is modulated by OOK (On Off Keying), which is the load modulation with sub-carrier frequency. Although one or two sub-carrier is defined in ISO/IEC15693, MB89R118C supports only one sub-carrier.
■ A nticollision
Anticollision is a key feature of RFID in order to recognize multiple tags within the RF fields, which is defined in ISO/IEC15693. The anticollision sequence is executed by inventory command, which is described later, and UIDs of individual tags are identified by 16 slot signals (EOF signals) transmitted in fixed interval following to the command.
If the number of tags in the RF fields are increased, more than two tags may response to the same slot, in which the collision is occurred. In this case, another inventory command is transmitted for the tags, and 16 EOF signals are followed in order to identify each of them. This procedure is continued until all the tags are identified. Therefore, in general the required time for whole procedure is depending on the number of tags to be identified.
EOF signal is modulated by ASK 10％ or 100％ , and the interval, which is the waiting time before sending a subusequent EOF slot, is specified in ISO/IEC15693. If the EOF is modulated with ASK10％ , the interval is always the same (complete time slot) regardless of the response from tag.
On the other hand, if it is modulated with ASK100％ , the interval, during which no response is detedted, is shorten (break time slot) and switch to the subsequent EOF slot quickly.
MB89R118C supports 100 ％ modulated EOF signals in addition to 10％ signals, and can execute the anticollision sequence quickly.
■ Commands
MB89R118C supports all Mandatory commands and Optional commands specified by ISO/IEC15693, including read, write, and lock commands. In addition as custom commands, FAST commands are supported in order to shorten the response time from tags.
One of the advantages of FeRAM embedded RFID is fast writing compared to E2PROM embedded RFID, because E2PROM requires internal high voltage when data is erased and written. For example, if it is assumed that 128bytes data is written into the memory, FeRAM embedded RFID can complete
within less than one thirds of the execution time of E2PROM embedded RFID. Theoretically MB89R118C enables to write 2,000bytes data into the memory in about 1.4 seconds.
Reading operation should not be different between E2PROM and FRAM, but Fast commands (custom commands) can shorten the execution time with twice rate of normal response. Theoretically MB89R118C can read 2,000byets data in 0.35 seconds, but practically it takes much longer because normally reader/writer dose not have enough memory buffer to accept huge amount of data. From our experience, FEIG product (German reader/writer) supports the Fast commands and enables to read 2,000bytes data in about 0.73 seconds.
Future Development
FeRAM embedded RFID products have specific features such as fast writing, large memory capacity, high endurance, and radiation hardness. Because of the features, FUJITSU SEMICONDUCTOR has been focusing the area where only FRAM embedded RFID can achieve.
In addition, we’re now developing the RFID products with serial interface for the embedded RF solution, which was already introduced here in “Vol.28 No.1.”
The serial interface expands the conventional usage of RFID, because it is connected with MCU(Controller). For example, it enables RF feature to use monitoring sensores or meters, switching the elecctric display, changing the operating parameter of MCU, and so on. FUJITSU SEMICONDUCTOR is going to develop the new value with our customers together.
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