24LCS22A-I/SN Microchip Technology, 24LCS22A-I/SN Datasheet - Page 11

• Manufacturer Part Number: 24LCS22A-I/SN
• Description: IC EEPROM 2KBIT 400KHZ 8SOIC
• Manufacturer: Microchip Technology

Specifications of 24LCS22A-I/SN

• Memory Size: 2K (256 x 8)
• Package / Case: 8-SOIC (3.9mm Width)
• Operating Temperature: -40°C ~ 85°C
• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Speed: 100kHz, 400kHz
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.5 V ~ 5.5 V
• Organization: 256 K x 8
• Interface Type: I2C
• Maximum Clock Frequency: 0.1 MHz
• Access Time: 3500 ns
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.5 V
• Maximum Operating Current: 3 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 2.5 V, 5.5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 24LCS22A-I/SNG; 24LCS22A-I/SNG; 24LCS22AI/SN

5.0
Since the device will not acknowledge during a write
cycle, this can be used to determine when the cycle is
complete (this feature can be used to maximize bus
throughput). Once the Stop condition for a Write
command has been issued from the master, the device
initiates the internally timed write cycle. ACK polling
can be initiated immediately. This involves the master
sending a Start condition followed by the control byte
for a Write command (R/W = 0). If the device is still
busy with the write cycle, then no ACK will be returned.
If the cycle is complete, then the device will return the
ACK and the master can then proceed with the next
Read or Write command. See Figure 5-1 for the flow
diagram.
FIGURE 5-2:
© 2009 Microchip Technology Inc.
Bus Activity
Master
Bus Activity
SDA Line
VCLK
ACKNOWLEDGE POLLING
R
S
T
A
T
S
PAGE WRITE
Control
Byte
A
C
K
Address
Word
A
C
K
Data (n)
FIGURE 5-1:
C
A
K
Data n + 1
Initiate Write Cycle
Send Control Byte
Write Command
Acknowledge
with R/W = 0
Condition to
(ACK = 0)?
Did Device
Send Stop
Send Start
Operation
Send
Next
ACKNOWLEDGE
POLLING FLOW
Yes
24LCS22A
A
C
K
Data n + 7
No
DS21682E-page 11
A
C
K
O
S
T
P
P