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R
22 mPGA604 Socket
Mechanical Design Guide
Table 4-3. Resistance Test Fixture Netlist (Sheet 2 of 2)
DC Endpoints Edgefingers: Hi Edgefingers: Low
Daisy
Chain
# of ©
per chain
Hi Low +I +V -V -I
42 16 E28 Y28 A8 A7 A122 A121
43 10 D29 N29 A10 A9 A34 A33
44 8 AA29 N29 A146 A145 A34 A33
45 10 C30 N30 A12 A11 A32 A31
46 10 AB30 N30 A144 A143 A32 A31
47 12 A31 N31 A16 A15 A30 A29
48 12 AD31 N31 A140 A139 A30 A29
4.2 Determination of Maximum Electrical Resistance
This section provides a guideline for the instruments used to take the measurements.
Note: The instrument selection should consider the guidelines in EIA 364-23A.
1. These measurements use a 4-wire technique, where the instruments provide two separate
circuits. One is a precision current source to deliver the test current. The other is a precision
voltmeter circuit to measure the voltage drop between the desired points.
2. These separate circuits can be contained within one instrument, such as a high quality micro-
ohmmeter, a stand-alone current source and voltmeter, or the circuits of a data acquisition
system.
3. Measurement accuracy in Ω is specified as ± 0.1% of reading, or ± 0.1 mΩ, whichever is
greater. The vendor is responsible for demonstrating that their instrument(s) can meet this
accuracy.
4. Automation of the measurements can be implemented by scanning the chains through the
edge or cable test connector using a switch matrix. The matrix can be operated by hand, or
through software.
5. Measure R
Total
for each daisy chain of “package + socket + motherboard” unit.
6. Measure R
jumper
for each daisy chain of 30 “package + motherboard” units. Calculate
for each daisy chain (There is 30 data for each daisy chain).
7. For each socket unit, calculate
R
Req
is the average contact resistance for socket pin.