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ST25DV64K Scheda tecnica(PDF) 142 Page - STMicroelectronics

Il numero della parte ST25DV64K
Spiegazioni elettronici  Dynamic NFC/RFID tag IC with 4-, 16-, or 64-Kbit EEPROM, and fast transfer mode capability
PDF  197 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
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ST25DV64K Scheda tecnica(HTML) 142 Page - STMicroelectronics

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Figure 75. I2C AC waveforms
SCL
SDA in
SCL
SDA out
SCL
SDA in
tCHCL
tDLCL
tCHDX
Start
condition
tCLCH
tDXCX
tCLDX
SDA
input
SDA
change
tCHDH
tDHDL
Data valid
tCLQV
tCLQX
tCHDH
Stop
condition
tCHDX
Start
condition
Write cycle
tW
Stop
condition
tCHCL
tXH1XH2
tXH1XH2
tXL1XL2
tXL1XL2
Data valid
tDL1DL2
Start
condition
Figure 76 shows how to calculate the value of the pull-up resistor. In applications where this method of
synchronization is not employed, the pull-up resistor is not necessary, provided that the bus master has a
push-pull (rather than open drain) output.
Figure 76. I2C Fast mode (fC = 1 MHz): maximum Rbus value versus bus parasitic capacitance (Cbus)
1
10
10
100
Bus line capacitor (pF)
I²C bus
master
ST25DV
Rbus
VCC
Cbus
SCL
SDA
Here,
R bu s × Cbu s= 120 ns
R
bu s × C
bu s = 150
ns
4
30
The Rbus x Cbus time constant
must be below 150 ns.
The time constant line is
represented on the left.
100
ST25DV04K ST25DV16K ST25DV64K
I2C parameters
DS10925 - Rev 11
page 142/197



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