PPC440GRX-NPAFFFTS AMCC [Applied Micro Circuits Corporation], PPC440GRX-NPAFFFTS Datasheet - Page 70

• Manufacturer Part Number: PPC440GRX-NPAFFFTS
• Description: PowerPC 440GRx Embedded Processor
• Manufacturer: AMCC [Applied Micro Circuits Corporation]

440GRx – PPC440GRx Embedded Processor
Thermal Monitor
Thermal monitoring of the chip is accomplished using the PNP transistor (β ≈ 2) provided on the chip. The collector
of the transistor is connected to ground (GND). The emitter (TherMonA) and base (TherMonB) are connected to
chip pins. A voltage measurement (V
values I
T = (q/nk)(V
Note: V
same. The small values require precision measurement and current sources.
Test Conditions
Clock timing and switching characteristics are specified in accordance with operating
conditions shown in the table Table 11 on page 64. AC specifications are characterized
with V
70
DD
1
BE2
and I
= +1.5V, T
BE2
PPC440GRx
and V
C
2
−V
provides the chip temperature in °K according to the equation:
BE1
BE1
B
C
)/ln(I
E
should be specified in Volts. I
= +85 °C and a 50pF test load as shown in the figure to the right.
2
/I
TherMonA
TherMonB
1
) °K
where q = 1.602 176 53×10
BE1
V
Note: The bias voltage V
and V
BE1
I
1
, I
, V
2
BE2
BE2
(Max = 300μA)
) across the TherMonA and TherMonB pins at the two current
1
and I
2
can be any units of measure provided they are the
-19
EB
, n = 1.0 ± 0.015, and k = 1.380 6505×10
should be between +0.5V and +0.7V.
Revision 1.08 – October 15, 2007
Preliminary Data Sheet
Output
Pin
AMCC Proprietary
-23
.
50pF