LM95213EB/NOPB National Semiconductor, LM95213EB/NOPB Datasheet - Page 9

• Manufacturer Part Number: LM95213EB/NOPB
• Description: BOARD EVALUATION FOR LM95213
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM95213EB/NOPB

• Sensor Type: Temperature
• Sensing Range: -40°C ~ 140°C
• Interface: SMBus (2-Wire/I²C)
• Sensitivity: ±1°C
• Voltage - Supply: 3 V ~ 3.6 V
• Embedded: No
• Utilized Ic / Part: LM95213
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM95213EB

Typical Performance Characteristics
1.0 Functional Description
LM95213 is an 11-bit digital temperature sensor with a 2-wire
System Management Bus (SMBus) interface that can monitor
the temperature of two remote diodes as well as its own tem-
perature. The LM95213 can be used to very accurately mon-
itor the temperature of up to two external devices such as
microprocessors, graphics processors or diode-connected
2N3904 transistor.
The LM95213 reports temperature in two different formats for
+127.875°C/–128°C range and 0°C/255°C range. The
LM95213 has a Sigma-Delta ADC (Analog-to-Digital Con-
verter) core which provides the first level of noise imunity. For
improved performance in a noisy environment the LM95213
includes programmable digital filters for Remote Diode 1 and
2 temperature readings. When the digital filters are invoked
the resolution for Remote Diode 1 and 2 readings increases
to 0.03125°C. For maximum flexibility and best accuracy the
LM95213 includes offset registers that allow calibration of
other diode types.
Diode fault detection circuitry in the LM95213 can detect the
absence or fault state of a remote diode: whether D+ is short-
ed to V
DD
Remote Temperature Reading Sensitivity to
, D- or ground, or whether D+ is floating.
Thermal Diode Filter Capacitance,
Average Power Supply Current
Conversion Rate Effect on
30013807
30013806
9
The LM95213 TCRIT1, TCRIT2 and TCRIT3 active low out-
puts are triggered when any unmasked channel exceeds its
corresponding programmable limit and can be used to shut-
down the system, to turn on the system fans or as a micro-
controller interrupt function. The current status of the
TCRIT1, TCRIT2 and TCRIT3 pins can be read back from the
status registers via the SMBus interface. The remote chan-
nels have two separate limits each that control the TCRIT1
and TCRIT2 pins. The TCRIT3 pin shares the limits of the
TCRIT2 pin but allows for different masking options. All limits
have a shared programmable hysteresis register.
Remote Diode temperature channels have programmable
digital filters in order to avoid false triggering the TCRIT pins.
LM95213 has a three-level address pin to connect up to 3
devices to the same SMBus master. LM95213 also has pro-
grammable conversion rate register as well as a shutdown
mode for power savings. One round of conversions can be
triggered in shutdown mode by writing to the one-shot register
through the SMBus interface. LM95213 can be programmed
to turn off unused channels for more power savings.
The LM95213 register set has an 8-bit data structure and in-
cludes:
Remote Diode Temperature Reading
Thermal Diode Capacitor or PCB
Leakage Current Effect on
30013823
www.national.com