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LM89
SNIS128C – AUGUST 2002 – REVISED MARCH 2013
Simplified Block Diagram
3.0V-3.6V
www.ti.com
Fault
S
Q
ALERT
Queue
Temperature
Sensor
Circuitry
10-Bit Plus Sign
' - 6
Converter
Programable
Level
Filter
Fault
R
Queue
D+
D-
Local/Remote
Diode Selector
Fault
Queue
T_Crit_A
Control Logic
One Shot
Register
Local/Remote
Temperature
Registers
HIGH
Limit
Registers
LOW
Limit
Registers
T_CRIT Limit Configuration Conversion
& Hysteresis and Status Rate
Registers Registers Registers
Remote Offset
Registers
Two-Wire Serial
Interface
SMBData
SMBClock
Connection Diagram
VSSOP-8 or SOIC-8
(TOP VIEW)
PIN DESCRIPTION
Label
V DD
Pin No.
1
Function
Positive Supply Voltage Input
Typical Connection
DC Voltage from 3.0 V to 3.6 V. V DD should be bypassed with a 0.1μF
capacitor in parallel with 100pF. The 100pF capacitor should be
placed as close as possible to the power supply pin. A bulk
capacitance of approximately 10μF needs to be in the near vicinity to
the LM89 V DD .
D+
2
Diode Current Source
To Diode Anode. Connected to remote discrete diode-connected
transistor junction or to the diode-connected transistor junction on a
remote IC whose die temperature is being sensed. A 2.2 nF diode
bypass capacitor is required to filter high frequency noise. Place the
2.2 nF capacitor between and as close as possible to the LM89's D+
and D ? pins. Make sure the traces to the 2.2 nF capacitor are
matched.
D ?
T_CRIT_A
GND
ALERT
3
4
5
6
Diode Return Current Sink
T_CRIT Alarm Output, Open-Drain,
Active-Low
Power Supply Ground
Interrupt Output, Open-Drain,
To Diode Cathode.
Pull-Up Resistor, Controller Interrupt or Power Supply Shutdown
Control
Ground
Pull-Up Resistor, Controller Interrupt or Alert Line
Active-Low
SMBData
7
SMBus Bi-Directional Data Line,
From and to Controller, Pull-Up Resistor
Open-Drain Output
SMBCLK
8
SMBus Input
From Controller, Pull-Up Resistor
2
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