M24LR64-R_1006 datasheet(40/128 Pages) STMICROELECTRONICS

Part #	M24LR64-R_1006

Description	64 Kbit EEPROM with password protection & dual interface

PDF	128 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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40 / 128 page

Communication signal from VCD to M24LR64-R

M24LR64-R

40/128

Doc ID 15170 Rev 10

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 and Figure 15.

The M24LR64-R is operational for any degree of modulation index from between 10% and

30%.

Figure 14.

100% modulation waveform

105%

95%

60%

Carrier

Amplitude

Min (µs)

6,0

2,1

Max (µs)

9,44

4,5

0,8

The clock recovery shall be operational after t4 max.

ai15793

M24LR64-R_1006 Datasheet(PDF) 40 Page - STMicroelectronics