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9 May 2001 Passive Components

SAMES has introduced a new family of passive RFID chips. The first release is the SA7110 read only device which operates at 125 kHz and offers features such as EEPROM flexibility of data and mode; on-chip high voltage regulation; on-chip RF frequency extractor/ prescaler; and customer-specific configuration of stored data.

The device is manufactured on SAMES' 1,2 µm N-well EEPROM process and has 64 bits of factory pre-programmed and locked bits in EEPROM memory. Its mode of operation is factory configured. The device mode of operation can be either Manchester coded or phase shift keyed (PSK) coded. The device has an on chip rectification circuit that converts the incoming RF signal to DC power feeding Vdd. There is also an on-chip modulator which works in conjunction with the rectifier. The time base is extracted by an on-chip RF clock extractor. High voltage protection is provided internally to protect against high voltages from the coil. These features result in a device requiring very low external component count, in effect the device can operate with only a coil connected externally.

Data is read at the RF interface by means of the on-chip modulator. The stored bits are clocked out sequentially during the read operation and an internal power-on-reset is provided which allows the device to start reading out data at low voltages for improved tag range.

SAMES is offering the devices in a number of ways: the devices can be bought as good die tested on sawn wafers or alternatively, as chip with coil. For customers with significant volumes, header codes can be allocated as customer specific with smaller volume customers taking sequential numbered devices from a generic header code. Two customer specific header codes have already been secured. SAMES says that it will release the SA7210 read/write devices shortly. These will contain authentication feature for writing secure data to chip. This device will also be sold as good die on sawn wafer or as chip with coil.

SAMES is a division of Labat Technologies. For further details contact Duncan Charity, (012) 333 6021, [email protected], [email protected]

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