PC87365 Datasheet, PDF (27/215 Pages) National Semiconductor (TI) – 128-Pin LPC SuperI/O with System Hardware Monitoring

1.0 Signal/Pin Connection and Description (Continued)
1.4.13 Strap Configuration
Signal Pin/s I/O Buffer Type Power Well
Description
BADDR 101
PSLDC0 99
PSLDC1 107
PSONPOL 109
TEST
98
I
IN_STRP
I
IN_STRP
I
IN_STRP
I
IN_STRP
V_DD
V_SB1
V_SB1
V_DD
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 30 KΩ
resistor.
If no pull-up resistor is connected, it is sampled low, setting the
Index-Data pair at 2Eh-2Fh.
Connecting a 10 KΩ external pull-up resistor to V_DD would make
it sample high, setting the Index-Data pair at 4Eh-4Fh.
Power Supply and LED Configuration. If no pull-up resistor is
connected to these pins, pins 33-35 and 37 function as
PWBTOUT, PSON, PWBTIN and SLPS5,respectively. Connecting
a 10K external pull-up resistor to V_SB causes these pins to
function as GPOS0, GPOS1 and GPIS2 and AVI0, respectively.
Power Supply On Polarity. If no pull-up resistor is connected to
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. If sampled high on the trailing edge of system reset, this
signal forces the device into test mode. This pin is for National
Semiconductor use only and should be left unconnected.
To put the chip in Test mode, connect an external pull-up to this
pin. Otherwise, leave it unconnected or connected to the UART
transceiver.
1. Make sure that the Serial Port driver is back-drive protected.
1.4.14 System Hardware Monitoring
Signal
ALARM
AVI0-6
D1N
D2N
D1P
D2P
OTS1
OTS2
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
46
I/O IN_AN2, O_AN1
V_SB
AV_DD
AV_DD
AV_DD
V_SB
AV_DD
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. Indicates that an overtemperature
was detected. See Section 2.9.10, the SuperI/O Configuration A
register, bit 0, for further details on which pin/s is/are active for
remote and local temperature sensing.
Reference Voltage. Provides reference voltage for the on-chip
A/D circuits. An external reference voltage should be connected to
this input.
27
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