M24LR04E-RDW6T/2 STMicroelectronics, M24LR04E-RDW6T/2 Datasheet - Page 53

• Manufacturer Part Number: M24LR04E-RDW6T/2
• Description: EEPROM 4-Kbit Dual EEPROM 1.8 to 5.5V 13.56Mhz
• Manufacturer: STMicroelectronics

Specifications of M24LR04E-RDW6T/2

• Product Category: EEPROM
• Memory Size: 4 Kbit
• Maximum Clock Frequency: 400 KHz
• Maximum Operating Current: 20 uA
• Operating Supply Voltage: 1.8 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TSSOP-8
• Factory Pack Quantity: 1

M24LR04E-R
11
11.1
11.1.1
Bit representation and coding
Data bits are encoded using Manchester coding, according to the following schemes. For
the low data rate, same subcarrier frequency or frequencies is/are used. In this case, the
number of pulses is multiplied by 4 and all times increase by this factor. For the Fast
commands using one subcarrier, all pulse numbers and times are divided by 2.
Bit coding using one subcarrier
High data rate
A logic 0 starts with eight pulses at 423.75 kHz (f
18.88 µs, as shown in
Figure 23. Logic 0, high data rate
For the fast commands, a logic 0 starts with four pulses at 423.75 kHz (f
unmodulated time of 9.44 µs, as shown in
Figure 24. Logic 0, high data rate, fast commands
A logic 1 starts with an unmodulated time of 18.88 µs followed by eight pulses at 423.75 kHz
(f
Figure 25. Logic 1, high data rate
For the Fast commands, a logic 1 starts with an unmodulated time of 9.44 µs followed by
four pulses of 423.75 kHz (f
Figure 26. Logic 1, high data rate, fast commands
C
/32), as shown in
Figure
Figure
25.
C
/32), as shown in
23.
Doc ID 022208 Rev 5
37.76µs
37.76µs
18.88µs
18.88µs
Figure
Figure
C
24.
/32) followed by an unmodulated time of
26.
Bit representation and coding
ai12067
ai12066
ai12077
ai12076
C
/32) followed by an
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