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24LC21A Arkusz danych(PDF) 6 Page - Microchip Technology

Numer części 24LC21A
Szczegółowy opis  1K 2.5V Dual Mode I 2 C Serial EEPROM
Download  16 Pages
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Producent  MICROCHIP [Microchip Technology]
Strona internetowa  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

24LC21A Arkusz danych(HTML) 6 Page - Microchip Technology

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24LC21A
DS21160F-page 6
 2003 Microchip Technology Inc.
FIGURE 3-3:
DISPLAY OPERATION PER DDC STANDARD PROPOSED BY VESA
Communication
is idle
Is Vsync
present?
No
Send EDID continuously
using Vsync as clock
High-to-low
transition on
SCL?
No
Yes
Yes
Stop sending EDID.
Switch to DDC2 mode.
Display has
transition state
?
optional
Set Vsync counter = 0
Change on
VCLK lines?
SCL, SDA or
No
Yes
High - low
transition on SCL
?
Reset Vsync counter = 0
No
Yes
Valid
received?
DDC2 address
No
No
VCLK
cycle?
Yes
Increment VCLK counter
Yes
Switch back to DDC1
mode.
DDC2 communication
idle. Display waiting for
address byte.
DDC2B
address
received?
Yes
Receive DDC2B
command
Respond to DDC2B
command
Is display
Access.busTM
Yes
Valid Access.bus
address?
No
Yes
See Access.bus
specification to determine
correct procedure.
Yes
No
Yes
No
No
No
The 24LC21A was designed to
Display Power-on
or
DDC Circuit Powered
from +5 volts
or start timer
Reset counter or timer
(if appropriate)
Counter=128 or
timer expired?
High-to-low
transition on
SCL?
No
Yes
comply to the portion of flowchart inside dash box
Note 1:
The base flowchart is copyright
 1993, 1994, 1995 Video Electronic Standard Association (VESA) from
VESA’s Display Data Channel (DDC) Standard Proposal ver. 2p rev. 0, used by permission of VESA.
2: The dash box and text “The 24LC21A and... inside dash box.” are added by Microchip Technology Inc.
3: Vsync signal is normally used to derive a signal for VCLK pin on the 24LC21A.
capable?


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