Essel Technology RFID A1, User Manual, Page: 9 / 60

9
2.7 Communication Buses
Table 2.6
2.8 Flash
Table 2.7
Symbol Parameter Min Typ Max Unit Notes
f
I2CMAX
I2C Maximum Clock
Frequency
400 kHz
f
SPIMAX
SPI Maximum Clock
Frequency
500 kHz
T
CSCLK
SPI CS To CLK Time Delay 2 µ
s
Minimum time delay between falling edge of Chip Select and first clock
edge.
T
CSHMIN
SPI CS high Minimum Time 50 µ
s
Minimum time when CS is in HIGH state between SPI transmissions.
Symbol Parameter Min Typ Max Unit Notes
C
FE
Flash Erase Cycles Before
Failure
20000 cycles
10 years For ambient temperature < 85 ° C
20 years For ambient temperature < 70°C
T
FDR
Flash Data Retention Time