Typical Application
20034303
Pin Descriptions
#
Label
Pin
Function
Typical Connection
Manufacturing test pins.
Left floating. PC board traces may be routed
through the pads for these pins. Although, the
components that drive these traces should share the
same supply as the LM91 so that the Absolute
Maximum Voltage at any Pin rating is not violated.
1, 5, 9, 13,
16
NC
Positive Supply Voltage
Input
VCC
D+
2
3
4
DC Voltage from 3.0V to 3.6V
Diode Current Source
To Diode Anode. Connected to remote discrete
diode or to the diode on the external IC whose die
temperature is being sensed.
To Diode Cathode. Must be grounded when not
used.
Diode Return Current Sink
D−
User-Set SMBus (I2C)
Address Inputs
Ground (Low, “0”), VCC (High, “1”) or open
(“TRI-LEVEL”)
ADD0–ADD1
GND
10, 6
7, 8
11
Power Supply Ground
Critical Temperature
Alarm, open-drain output
SMBus (I2C) Serial
Bi-Directional Data Line,
open-drain output
Ground
Pull Up Resistor, Controller Interrupt Line or System
Shutdown
T_CRIT_A
From and to Controller, Pull Up Resistor
SMBData
12
SMBCLK
NC
14
15
SMBus (I2C) Clock Input
From Controller
No Connection
Left floating. PC board traces may be routed
through the pads for this pin.
3
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