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AMD Geode™ LX Processors Data Book 
33234H
TDP
AL17
A
Analog
N/A
Thermal Diode Positive (TDP). TDP is the positive 
terminal of the thermal diode on the die. The diode is 
used to do thermal characterization of the device in 
a system. This signal works in conjunction with TDN.
For accurate die temperature measurements, a dual 
current source remote sensor, such as the National 
Semiconductor LM82, should be used. Single cur-
rent source sensors may not yield the desired level 
of accuracy.
If reading the CPU temperature is required while the 
system is off, then a small bias (<0.25V) on V
IO
 is 
required for the thermal diode to operate properly.
TDN
AK17
A
Analog
N/A
Thermal Diode Negative (TDN). TDN is the nega-
tive terminal of the thermal diode on the die. The 
diode is used to do thermal characterization of the 
device in a system. This signal works in conjunction 
with TDP.
For accurate die temperature measurements, a dual 
current source remote sensor, such as the National 
Semiconductor LM82, should be used. Single cur-
rent source sensors may not yield the desired level 
of accuracy.
If reading the CPU temperature is required while the 
system is off, then a small bias (<0.25V) on V
IO
 is 
required for the thermal diode to operate properly.
3.4.1
System Interface Signals (Continued)
Signal Name
Ball 
No.
Type
f
V
Description
3.4.2
PLL Interface Signals
Signal Name
Ball 
No.
Type
f
V
Description
CAV
DD
W31
APWR
Analog
3.3
Core PLL Analog Power. Connect to 3.3V.
CAV
SS
W30
APWR
Analog
0
Core PLL Analog Ground. Connect to ground.
MAV
DD
V31
APWR
Analog
3.3
GLIU PLL Analog Power. Connect to 3.3V.
MAV
SS
V30
APWR
Analog
0
GLIU PLL Analog Ground. Connect to ground.
VAV
DD
AA1
APWR
Analog
3.3
Video PLL Analog Power. Connect to 3.3V.
VAV
SS
AA2
APWR
Analog
0
Video PLL Analog Ground. Connect to ground.
CLPF
W29
A
Analog
N/A
Core PLL Low Pass Filter. 220 pF to CAV
SS
.
MLPF
V29
A
Analog
N/A
GLIU PLL Low Pass Filter. 220 pF to MAV
SS.
VLPF
AA3
A
Analog
N/A
Video PLL Low Pass Filter. 220 pF to VAV
SS.