ST24FC21 STMICROELECTRONICS [STMicroelectronics], ST24FC21 Datasheet - Page 6

• Manufacturer Part Number: ST24FC21
• Description: 1 Kbit x8 Dual Mode Serial EEPROM for VESA PLUG & PLAY
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

ST24LC21B, ST24LW21, ST24FC21, ST24FC21B, ST24FW21
Figure 5. Error Recovery Mechanism Flowchart for the ST24FC21, ST24FC21B and ST24FW21
products
6/22
Transition
(VESA 2)
State
NO
Internal Address Pointer = 0
VCLK Internal Counter = 0
Start Internal 2 sec Timer
(START + Device Select)
Increment VCLK Counter
NO
Transmit-Only Mode
NO
Memory Power On
or Timer > 2 sec
Switch Back to
Counter = 128
I
NO
NO
SDA Hi-Z
2
C access
VCLK
VCLK
Valid
SCL
SCL
?
YES
YES
YES
YES
YES
YES
Send Data bit (MSB first) pointed
auto-increment pointed bit/byte
by the Address Pointer and
waiting for a Device Select byte
Reset VCLK Internal Counter
Reset Counter and Timer
Respond to the Incoming
and Reset Internal Timer
I
2
C communication idle
Send Acknowledge
I
2
C Command
AI01748
Transmit-Only Mode
(DDC1)
I
(DDC2B)
2
C Mode