LM75BD Circuit Board Chips Digital temperature sensor and thermal watchdog
electronic chip board
,electronic components ic
LM75BD Circuit Board Chips Digital temperature sensor and thermal watchdog
1. General description
The LM75B is a temperature-to-digital converter using an on-chip band gap temperature
sensor and Sigma-Delta A-to-D conversion technique with an overtemperature detection
output.
The LM75B contains a number of data registers: Configuration register (Conf) to
store the device settings such as device operation mode, OS operation mode, OS polarity
and OS fault queue; temperature register (Temp) to store the digital temp reading, and
set-point registers (Tos and Thyst) to store programmable overtemperature shutdown and
hysteresis limits, that can be communicated by a controller via the 2-wire serial I2C-bus
interface. The device also includes an open-drain output (OS) which becomes active when
the temperature exceeds the programmed limits. There are three selectable logic address
pins so that eight devices can be connected on the same bus without address conflict.
The LM75B can be configured for different operation conditions. It can be set in normal
mode to periodically monitor the ambient temperature, or in shutdown mode to minimize
power consumption.
The OS output operates in either of two selectable modes:
OS comparator mode or OS interrupt mode. Its active state can be selected as either
HIGH or LOW.
The fault queue that defines the number of consecutive faults in order to
activate the OS output is programmable as well as the set-point limits.
The temperature register always stores an 11-bit 2's complement data giving a
temperature resolution of 0.125 °C.
This high temperature resolution is particularly useful
in applications of measuring precisely the thermal drift or runaway.
When the LM75B is accessed the conversion in process is not interrupted
(i.e., the I2C-bus section is totally independent of the Sigma-Delta converter section) and
accessing the LM75B continuously without waiting at least one conversion time between
communications willnot prevent the device from updating the Temp register with a new
conversion result.
The new conversion result will be available immediately after the Temp register is updated.
The LM75B powers up in the normal operation mode with the OS in comparator mode,
temperature threshold of 80 °C and hysteresis of 75 °C, so that it can be used as a
stand-alone thermostat with those pre-defined temperature set points.
2. Features
■ Pin-for-pin replacement for industry standard LM75 and LM75A and offers improved
temperature resolution of 0.125 °C and specification of a single part over power supply
range from 2.8 V to 5.5 V
■ I2C-bus interface with up to 8 devices on the same bus
■ Power supply range from 2.8 V to 5.5 V
■ Temperatures range from −55 °C to +125 °C
■ Frequency range 20 Hz to 400 kHz with bus fault time-out to prevent hanging up the
bus
■ 11-bit ADC that offers a temperature resolution of 0.125 °C
■ Temperature accuracy of:
◆ ±2 °C from −25 °C to +100 °C
◆ ±3 °C from −55 °C to +125 °C
■ Programmable temperature threshold and hysteresis set points
■ Supply current of 1.0 µA in shutdown mode for power conservation
■ Stand-alone operation as thermostat at power-up
■ ESD protection exceeds 4500 V HBM per JESD22-A114, 450 V MM per
JESD22-A115 and 2000 V CDM per JESD22-C101
■ Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
■ Small 8-pin package types: SO8, TSSOP8 and 3 mm × 2 mm XSON8U
3. Applications
■ System thermal management
■ Personal computers
■ Electronics equipment
■ Industrial controllers
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SMBJ5.0A Silicon Avalanche Diodes 600W Surface Mount TVS Diodes
Image | Part # | Description | |
---|---|---|---|
0402 0.063W 10kOhm SMT Thick Film Chip Resistor RC0402JR-0710KL |
10 kOhms ±5% 0.063W, 1/16W Chip Resistor 0402 (1005 Metric) Moisture Resistant Thick Film
|
||
200MHz MPZ1608S300ATAH0 Chip Beads 5A For Power Line TDK SMD0603 |
30 Ohms 1 Power Line Ferrite Bead 0603 (1608 Metric) 5A 10mOhm
|
||
22R 5% SMD0402 Film Chip Resistors ERJ-2GEJ220X PANASONIC |
22 Ohms ±5% 0.1W, 1/10W Chip Resistor 0402 (1005 Metric) Automotive AEC-Q200 Thick Film
|
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MOV-20D751K 750V 6.5kA Varistor blue SMD Chip Resistor 1 Circuit Through Hole Disc 20mm |
750 V 6.5 kA Varistor 1 Circuit Through Hole Disc 20mm
|
||
2SB1261-TP 10W General Purpose Rectifier Diode Silicon Epitaxial Planar Pnp Transistor |
Bipolar (BJT) Transistor PNP 60 V 3 A 50MHz 1 W Surface Mount D-Pak
|
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IXFK140N30P Polar Power Mosfet Hiperfet TO264 300V 140A |
N-Channel 300 V 140A (Tc) 1040W (Tc) Through Hole TO-264AA (IXFK)
|
||
DF2B29FU,H3F TVS 24VWM 47V ESD Protection Diodes |
47V Clamp 3A (8/20µs) Ipp Tvs Diode Surface Mount USC
|
||
PMEG6010ER 1A Low VF MEGA Schottky Barrier Rectifier SOD123 |
Diode 60 V 1A Surface Mount SOD-123W
|
||
SK34SMA 3A SMD Schottky Barrier Rectifier Diodes DO - 214AC |
Diode 40 V 3A Surface Mount DO-214AC, SMA
|
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SMBJ5.0A Silicon Avalanche Diodes 600W Surface Mount TVS Diodes |
9.2V Clamp 65.3A Ipp Tvs Diode Surface Mount DO-214AA (SMBJ)
|