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M34C02-LMB1G Datasheet(PDF) 20 Page - STMicroelectronics

Part # M34C02-LMB1G
Description  2 Kbit Serial I짼C Bus EEPROM for DIMM serial presence detect
PDF  31 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M34C02-LMB1G Datasheet(HTML) 20 Page - STMicroelectronics

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Initial delivery state
M34C02-W, M34C02-L, M34C02-R
20/31
5
Initial delivery state
The device is delivered with all bits in the memory array set to 1 (each Byte contains FFh).
Figure 11.
Serial presence detect block diagram
1.
E0, E1 and E2 are wired at each DIMM socket in a binary sequence for a maximum of 8 devices.
2.
Common clock and common data are shared across all the devices.
3.
Pull-up resistors are required on all SDA and SCL bus lines (typically 4.7 k
Ω) because these lines are open
drain when used as outputs.
R = 4.7k
Ω
AI01937
DIMM Position 7
SDA
SCL
E0
E1
E2
VCC
DIMM Position 6
SDA
SCL
E0
E1
E2
DIMM Position 5
SDA
SCL
E0
E1
E2
DIMM Position 4
SDA
SCL
E0
E1
E2
DIMM Position 3
SDA
SCL
E0
E1
E2
DIMM Position 2
SDA
SCL
E0
E1
E2
VCC
DIMM Position 1
SDA
SCL
E0
E1
E2
DIMM Position 0
SDA
SCL
E0
E1
E2
VSS
VSS
VSS
VCC
VSS
VSS VCC
VCC
VSS
VCC
VCC VSS
VSS
VCC
SCL line
SDA line
From the motherboard
I2C master controller



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