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ST25DV64KC Datenblatt(PDF) 148 Page - STMicroelectronics

Teilenummer ST25DV64KC
Bauteilbeschribung  Dynamic NFC/RFID tag IC with 4-Kbit, 16-Kbit or 64-Kbit EEPROM, fast transfer mode capability and optimized I2C
PDF  203 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST25DV64KC Datenblatt(HTML) 148 Page - STMicroelectronics

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Figure 81. 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
Stop
condition
Data valid
tCLQV
tCLQX
tCHDH
Stop
condition
tCHDX
Start
condition
Write cycle
tW
Start
condition
tCHCL
tXH1XH2
tXH1XH2
tXL1XL2
tXL1XL2
Data valid
tDL1DL2
Figure 82 indicates how the value of the pull-up resistor can be calculated. In most applications, though, this
method of synchronization is not employed, and so the pull-up resistor is not necessary, provided that the bus
master has a push-pull (rather than open drain) output.
Figure 82. 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
ST25DV04KC ST25DV16KC ST25DV64KC
I2C DC and AC parameters
DS13519 - Rev 3
page 148/203



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