M24M01-VLA6 Ver la hoja de datos (PDF) - STMicroelectronics

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M24M01-VLA6

1 Mbit Serial I²C Bus EEPROM

STMicroelectronics 

M24M01

SIGNAL DESCRIPTION

Serial Clock (SCL). This input signal is used to

strobe all data in and out of the device. In applica-

tions where this signal is used by slave devices to

synchronize the bus to a slower clock, the bus

master must have an open drain output, and a

pull-up resistor must be connected from Serial

Clock (SCL) to VCC. (Figure 4 indicates how the

value of the pull-up resistor can be calculated). In

most applications, though, this method of synchro-

nization is not employed, and so the pull-up resis-

tor is not necessary, provided that the bus master

has a push-pull (rather than open drain) output.

Serial Data (SDA). This bi-directional signal is

used to transfer data in or out of the device. It is an

open drain output that may be wire-OR’ed with

other open drain or open collector signals on the

bus. A pull up resistor must be connected from Se-

rial Data (SDA) to VCC. (Figure 4 indicates how the

value of the pull-up resistor can be calculated).

Chip Enable (E1, E2). These input signals are

used to set the value that is to be looked for on bits

b3 and b2 of the 7-bit Device Select Code. These

inputs must be tied to VCC or VSS, to establish the

Device Select Code. When unconnected, the Chip

Enable (E1, E2) signals are internally read as VIL

(see Table 10 and Table 11).

Write Control (WC). This input signal is useful

for protecting the entire contents of the memory

from inadvertent write operations. Write opera-

tions are disabled to the entire memory array when

Write Control (WC) is driven High. When uncon-

nected, the signal is internally read as VIL, and

Write operations are allowed.

When Write Control (WC) is driven High, Device

Select and Address bytes are acknowledged,

Data bytes are not acknowledged.

Figure 4. Maximum RL Value versus Bus Capacitance (CBUS) for an I2C Bus

20

16

12

8

4

0

10

VCC

fc = 100kHz

fc = 400kHz

100

CBUS (pF)

RL

SDA

MASTER

SCL

RL

CBUS

1000

CBUS

AI01665

5/21

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