PC87366 Datasheet, PDF (30/240 Pages) National Semiconductor (TI) – 128-Pin LPC SuperI/O with System Hardware Monitoring, MIDI and Game Ports

1.0 Signal/Pin Connection and Description (Continued)
1.4.15 Strap Configuration
Signal Pin/s I/O Buffer Type Power Well
Description
BADDR 101
I
IN_STRP
Base Address. Sampled by the trailing edge of the system reset
to determine the base address of the configuration Index-Data
register pair. During reset, it is pulled down by internal 30Kohm
resistor.
V_{DD If no pull-up resistor is connected, it is sampled low, setting the}
Index-Data pair at 2Eh-2Fh.
Connecting a 10K external pull-up resistor to V_DD would make it
sample high, setting the Index-Data pair at 4Eh-4Fh.
PSLDC0 99
PSLDC1 107
Power Supply and LED Configuration. If no pull-up resistor is
connected to these pins, pins 33-35 and 37 function as
I
IN_STRP
V_SBNote ^1.
PWBTOUT, PSON, PWBTIN and SLPS5 respectively.
Connecting a 10K external pull-up resistor to V_SB causes these
pins to function as GPOS0, GPOS1, GPIS2, and AVI0,
respectively.
PSONPOL 109
Power Supply On Polarity. If no pull-up resistor is connected to
I
IN_STRP
V_SBNote ^1.
this pin, PSON is set active low with open-drain output.
Connecting a 10K external pull-up resistor to V_SB causes PSON
to be set to active high with push-pull output.
TEST
98
I
IN_STRP
Test. If sampled high on the trailing edge of system reset, this
V_DD signal forces the device into test mode. This pin is for National
Semiconductor use only, and should be left unconnected.
Note 1.Make sure that the Serial Port driver is back-drive protected.
1.4.16 System Hardware Monitoring
Signal
ALARM
AVI0-6
D1N
D2N
D1P
D2P
OTS1
OTS2
TS1-3
V_REF
Pin(s) I/O Buffer Type Power Well
Description
27
O
37-43 I
47
49
I
48
50
O
24
25
O
OD₆
IN_AN1
IN_AN3
O_AN2
OD₆
V_SB
AV_DD
AV_DD
AV_DD
V_SB
Alarm. Alerts on voltage input mismatch
Analog Voltage Inputs. Analog inputs of the A/D converter.
Diode Cathode. Diodes 1 and 2 return current sink. Must be
grounded when not used.
Diode Anode. Diodes 1 and 2 current source. Connected to
remote discrete diodes
Overtemperature Shutdown. Indicate that an overtemperature
was detected. See Section 2.8.9, the SuperI/O Configuration A
register, bit 0, for further details on which pin/s is/are active for
remote and local temperature sensing.
47-49 I
IN_AN1
46
I/O IN_AN2, O_AN1
AV_DD
AV_DD
Thermistor Sensors. Analog inputs.
Reference Voltage. Provides reference voltage for the on-chip
A/D circuits. An external reference voltage should be connected to
this input.
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