M24LR64-RDW6T2 STMICROELECTRONICS [STMicroelectronics], M24LR64-RDW6T2 Datasheet - Page 40
M24LR64-RDW6T2
Manufacturer Part Number
M24LR64-RDW6T2
Description
64 Kbit EEPROM with password protection & dual interface
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
1.M24LR64-RDW6T2.pdf
(128 pages)
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Communication signal from VCD to M24LR64-R
8
40/128
Communication signal from VCD to M24LR64-R
Communications between the VCD and the M24LR64-R takes place using the modulation
principle of ASK (Amplitude Shift Keying). Two modulation indexes are used, 10% and
100%. The M24LR64-R decodes both. The VCD determines which index is used.
The modulation index is defined as [a – b]/[a + b] where a is the peak signal amplitude and
b, the minimum signal amplitude of the carrier frequency.
Depending on the choice made by the VCD, a “pause” will be created as described in
Figure 14
The M24LR64-R is operational for any degree of modulation index from between 10% and
30%.
Figure 14. 100% modulation waveform
The clock recovery shall be operational after t
105%
95%
60%
and
5%
Amplitude
a
b
Carrier
Figure
15.
Doc ID 15170 Rev 10
t
1
t
2
t
4
4
t
max.
3
t
t
t
t
t
1
2
3
4
Min (µs)
ai15793
6,0
2,1
0
0
M24LR64-R
Max (µs)
9,44
4,5
0,8
t
1
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