AT24RF08C View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'AT24RF08C' PDF : 21 Pages View PDF
Voltage Levels
The chip includes a voltage reference to ensure that
command initiated reads and writes from the RFID port are
only performed when the power supply voltage on the chip
is above the level (Vcoil2) at which EEPROM reads and
writes can be guaranteed. If an EEPROM read or write is
attempted when the voltage is too low, the command will be
aborted.
Below the Vcoil2 level, but above a minimal operating
voltage level of Vcoil1, header and ID reads are permitted.
In addition, the two tamper latch commands and the two
QUIET bit commands may also be executed at lower
voltages. Because the EEPROM data may not be read
correctly at this voltage, the ID field must contain some
error detection information stored within it.
Proper setting of the tamper bit feature is guaranteed only if
VCOIL is above 3.7V for greater than 6.1 ms, but under
typical conditions, the circuit will operate over a much wider
range.
When power is removed from the serial interface side (VCC
pin), the RFID operation will be momentarily reset while the
internal circuitry switches the internal power supply to the
RFID bridge. When the voltage on the VCC pin is held to
above 0.6V but less than 2.4V (both nominal), all read and
write commands from the RFID port may be inhibited. ID
transmission and tamper bit commands may be executed,
although their operation may not be correct.
Absolute Maximum Ratings
Coil Voltage (peak-to-peak)
Maximum.............................................................................24V
Operating Junction Temperature...........................-40 to +85°C
Storage Temperature (Without Bias)...................-55 to +125°C
Voltage on VCC with
Respect to Ground............................................................6.0V
Voltage on SDA, SCL, PROT and WP............-0.1 to VCC +0.3V
*NOTICE:
Stresses beyond those listed under “Absolute
Maximum Ratings” may cause permanent
damage to the device. This is a stress rating only
and functional operation of the device at these or
any other conditions beyond those indicated in
the operational sections of this specification is
not implied. Exposure to absolute maximum
ratings conditions for extended periods may
affect device reliability.
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AT24RF08C
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