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LE24L042CS Datasheet(PDF) 9 Page - Sanyo Semicon Device

Part # LE24L042CS
Description  Two Wire Serial Interface EEPROM
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Manufacturer  SANYO [Sanyo Semicon Device]
Direct Link  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

LE24L042CS Datasheet(HTML) 9 Page - Sanyo Semicon Device

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LE24L042CS
Application Notes
1) Software reset function
Software reset (start condition + 9 dummy clock cycles + start condition), shown in the figure below, is executed in
order to avoid erroneous operation after power-on and to reset while the command input sequence. During the
dummy clock input period, the SDA bus must be opened (set to high by a pull-up resistor). Since it is possible for
the ACK output and read data to be output from the EEPROM during the dummy clock period, forcibly entering H
will result in an overcurrent flow.
Note that this software reset function does not work during the internal write cycle.
No.A1440-9/10
2) Pull-up resistor of SDA pin
Due to the demands of the I
2C bus protocol function, the SDA pin must be connected to a pull-up resistor (with a
resistance from several k
Ω to several tens of kΩ) without fail. The appropriate value must be selected for this
resistance (RPU) on the basis of the VIL and IIL of the microcontroller and other devices controlling this product as
well as the VOL–IOL characteristics of the product. Generally, when the resistance is too high, the operating
frequency will be restricted; conversely, when it is too low, the operating current consumption will increase.
RPU maximum resistance
The maximum resistance must be set in such a way that the bus potential, which is determined by the sum total (IL)
of the input leaks of the devices connected to the SDA bus and by RPU, can completely satisfy the input high level
(VIH min) of the microcontroller and EEPROM. However, a resistance value that satisfies SDA rise time tR and fall
time tF must be set.
RPU maximum value = (VDD - VIH)/IL
Example: When VDD=2.5V and IL= 2μA
RPU maximum value = (2.5V − 2.5V × 0.8)/2μA = 250kΩ
RPU minimum value
A resistance corresponding to the low-level output
voltage (VOL max) of SANYO’s EEPROM must be set.
RPU minimum value = (VDD − VOL)/IOL
Example: When VDD=2.5V, VOL = 0.4V and IOL = 1mA
RPU minimum value = (2.5V − 0.4)/1mA = 2.1kΩ
Recommended RPU setting
RPU is set to strike a good balance between the operating frequency requirements and power consumption. If it is
assumed that the SDA load capacitance is 50pF and the SDA output data strobe time is 500ns, RPU will be about
RPU = 500ns/50pF = 10kΩ.
Start condition
SCL
SDA
Dummy clock cycle
× 9
1
8
2
9
Start condition
Master
device
EEPROM
SDA
CBUS
RPU
IL
IL


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