m34e02 STMicroelectronics, m34e02 Datasheet - Page 23

• Manufacturer Part Number: m34e02
• Description: 2 Kbit Serial I?c Bus Eeprom With Permanent And Reversible, Software Write Protection
• Manufacturer: STMicroelectronics

M34E02
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 ) because these lines are open
AI01937
drain when used as outputs.
DIMM Position 7
DIMM Position 6
DIMM Position 5
DIMM Position 4
DIMM Position 3
DIMM Position 2
DIMM Position 1
DIMM Position 0
V CC
V CC V SS
V CC
V SS
V SS V CC
V SS
E2
E2
E2
E2
E2
E2
E2
E2
V CC
V SS
E1
E1
E1
E1
E1
E1
E1
E1
V CC
V CC
V CC
V SS
V SS
V SS
E0
E0
E0
E0
E0
E0
E0
E0
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SCL
SDA
SDA
SDA
SDA
SDA
SDA
SDA
SDA
Use within a DDR2 DIMM
SCL line
From the motherboard
I
2
C master controller
R = 4.7k
SDA line
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