M34C02-FDS1TG Ver la hoja de datos (PDF) - STMicroelectronics

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M34C02-FDS1TG

2 Kbit Serial I²C Bus EEPROM For DIMM Serial Presence Detect

STMicroelectronics 

Figure 11. Serial Presence Detect Block Diagram

M34C02

DIMM Position 7

E2 E1 E0 SCL SDA

R = 4.7kΩ

DIMM Position 6

VCC

E2 E1 E0 SCL SDA

DIMM Position 5

VCC

VSS

E2 E1 E0 SCL SDA

DIMM Position 4

VCC VSS VCC

E2 E1 E0 SCL SDA

DIMM Position 3

VCC

VSS

E2 E1 E0 SCL SDA

DIMM Position 2

VSS

VCC

E2 E1 E0 SCL SDA

DIMM Position 1

VSS VCC VSS

E2 E1 E0 SCL SDA

DIMM Position 0

VSS

VCC

E2 E1 E0 SCL SDA

VSS

AI01937

SCL line

SDA line

From the motherboard

I2C master controller

Note: 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 kΩ) because these lines are open drain when used as

outputs.

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