AN2014 datasheet(27/65 Pages) STMICROELECTRONICS

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DocID10701 Rev 10

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AN2014

Hardware considerations

Figure 20. Write control input (WC)

The /WC pull-up resistor has to be compatible with the master output driving capability, as

detailed in Table 6.

4.1.5

Recommended I2C EEPROM connections

Recommended I²C EEPROM connections are shown in Figure 21 and Figure 22. Note that

for both circuits:

WC pin

ai10916b

RPD

I typ = 2.5µA

at VCC = 5V

VCC

ESD/EOS Protection

Table 6. Connecting WC inputs in I2C products

I²C

1 Kbit to 16 Kbits

32 Kbits and more

WC internal pull-down resistance (RPD)(1)

(devices identified with process letters K or T)

WC internal pull-down resistance (RPD)(1)

(all previous devices)

50 k

15 k

50 k

30 k

External pull-up (RPU)

Condition:

Therefore:

WC inputs not connected (left floating)

WC is read as “0”

Input leakage Ili

Ili = 0 for Vi = 0V

Ili = Vi/RPD for 0<Vi<VIH

lli < 5µA for Vi > VIH

1. These pull-down values can change within the range authorized in the datasheet without previous notice.

RPD

RPU RPD

-----------------------------

0.7

≥

RPU

3RPD

----------------------

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