
SMSC DS – LPC47M192 
Page 196 
Rev. 03/30/05 
DATASHEET 
HARDWARE MONITORING BLOCK 
(T
A
 = 0
o
C – 70
o
C, HV
CC
 = +3.3 ± 10%)
PARAMETER 
Temperature-to-Digital 
Converter Characteristics 
Internal Temperature Accuracy 
External 
Diode 
Accuracy 
Remote Source Current 
High Level 
Low Level 
SYMBOL
MIN 
-3 
-2 
-5 
-3 
TYP 
±1 
±1 
90 
5.5 
MAX 
+3 
+2 
+5 
+3 
130 
7.5 
UNITS 
o
C 
o
C 
o
C 
o
C 
o
C 
o
C 
μA 
μA 
COMMENTS 
Sensor 
0
0
C <= T
A
 <= 70
0
C 
40
0
C <= T
A
 <= 70
0
C 
Resolution 
-40
0
C <= T
S
 <= 125
0
C 
40
0
C <= T
S
 <= 100
0
C 
Resolution 
I
ANG
 Type Buffer – Analog 
Inputs 
(Dx+, 
Dx-, 
+3.3V_IN, +5V_IN, +12V_IN) 
V
CC
 Supply Current Active 
+2.5V_IN, 
Refer to “Appendix A – Thermal Diode Parameters” and “Appendix B – ADC 
Voltage Conversion”. 
See “Supply Current” subsection in “Hardware Monitoring Block Specifications” 
section above. 
Notes
:  
Voltages are measured from the local ground potential, unless otherwise specified. 
Typicals are at TA=25°C and represent most likely parametric norm. 
The maximum allowable power dissipation at any temperature is PD = (TJmax - TA) / QJA. 
Timing specifications are tested at the TTL logic levels, VIL=0.4V for a falling edge and VIH=2.4V for a rising 
edge. TRI-STATE output voltage is forced to 1.4V. 
Note 1: 
All leakage currents are measured with all pins in high impedance. 
Note 2:
 The minimum value given for V
TR
 applies when V
CC
 is active.  When V
CC
 is 0V, the minimum V
TR
 is 0V. 
Note 3:
Max I
TRI
 with V
CC 
= 3.3V (nominal) is 5mA 
Max I
TRI
 with V
CC
 = 0V (nomial) is 250uA 
Note 4:
  TUE (Total Unadjusted Error) includes Offset, Gain and Linearity errors of the ADC. 
Note 5:
  Total Monitoring Cycle Time includes all temperature conversions, all analog input voltage conversions. 
Note 6:
  The cycle time for option 1 is 542.336ms (typical) if 128 measurements are averaged for the remote diode 
temperature reading and 8 measurements are averaged for all voltage and the internal temperature reading. It is 
67.792ms (typical) for option 2 if 16 measurements are averaged for the remote diode temperature reading and a 
single measurement is taken for all voltage and the internal temperature reading (i.e., no averaging).  
Note 7:
V
OH
 min and I
OH
 does not apply to the RESET# and THERM# open-drain functions. 
11.3.1 CAPACITANCE VALUES FOR PINS 
The input and output capacitance applies to both the Super I/O Block and the Hardware Monitoring Block digital pins. 
CAPACITANCE T
A
 = 25
o
C; fc = 1MHz; V
CC
 = 3.3V ±10% 
PARAMETER 
Clock Input Capacitance 
LIMITS 
TYP 
SYMBOL 
C
IN
C
IN
C
OUT
MIN 
MAX 
20 
UNIT 
pF 
TEST CONDITION 
All pins except pin 
under test tied to AC 
ground 
Input Capacitance 
10 
pF 
Output Capacitance 
Note:
  The input capacitance of a port is measured at the connector pins. 
20 
pF