|
|
PDF LM80 Data sheet ( Hoja de datos )
| Número de pieza | LM80 | |
| Descripción | Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LM80 (archivo pdf) en la parte inferior de esta página. Total 29 Páginas | ||
|
No Preview Available !
June 1999
LM80
Serial Interface ACPI-Compatible Microprocessor System
Hardware Monitor
General Description
The LM80 provides 7 positive voltage inputs, temperature
measurement, fan speed measurement, and hardware
monitoring on an I2C™ interface. The LM80 performs
WATCHDOG™ comparisons of all measured values and an
open-drain interrupt output becomes active when any values
exceed programmed limits. A Chassis Intrusion input is pro-
vided to monitor and reset an external circuit designed to
latch a chassis intrusion event.
The LM80 is especially suited to interface to both linear and
digital temperature sensors. The 10 mV LSB and 2.56 volt
input range is ideal for accepting inputs from a linear sensor
such as the LM50. The BTI is used as an input from either
digital or thermostat sensors such as LM75 and LM56.
The LM80’s 2.8V to 5.75V supply voltage range, low supply
current, and I2C interface make it ideal for a wide range of
applications. These include hardware monitoring and protec-
tion applications in personal computers, electronic test
equipment, and office electronics.
Features
n Temperature sensing
n 7 positive voltage inputs
n 2 programmable fan speed monitoring inputs
n 10 mV LSB and 2.56V input range accepts outputs from
linear temperature sensors such as the LM50
n Chassis Intrusion Detector input
n WATCHDOG comparison of all monitored values
n Separate input to show status in Interrupt Status
Register of additional external temperature sensors such
as the LM56 or LM75
n I2C Serial Bus interface compatibility
n Shutdown mode to minimize power consumption
n Programmable RST_OUT/OS pin: RST_OUT provides a
Reset output; OS provides an Interrupt Output activated
by an Overtemperature Shutdown event
Key Specifications
n Voltage monitoring Error
n Temperature Error
−25˚C to +125˚C
n Supply Voltage Range
n Supply Current
n ADC Resolution
n Temperature Resolution
Operating:
Shutdown:
±1% (max)
± 3˚C (max)
2.8V to
5.75V
0.2 mA typ
15 µA typ
8 Bits
0.5˚C
Applications
n System Thermal and Hardware Monitoring for Servers
and PCs
n Office Electronics
n Electronic Test Equipment and Instrumentation
Typical Application
# Indicates Active Low (“Not”)
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
WATCHDOG™ is a trademark of National Semiconductor Corporation.
I2C® is a registered trademark of the Philips Corporation.
© 1999 National Semiconductor Corporation DS100040
DS100040-1
www.national.com
1 page  
DC Electrical Characteristics (Continued)
The following
IN0-IN6 RS =
specifications apply for
25Ω, unless otherwise
+2.8 VDC
specified.
≤V+ ≤ +3.8 VDC
Boldface limits
faopr pLlMy 8fo0Cr ITMAT=-3T, J+4=.2T5MVINDCto≤TVM+A≤X;+a5l.l7o5thVeDrClimfoirtsLMTA80=CTIMJ T=-5,
25˚C.(Note 7)
Symbol
Parameter
Conditions
Typical
Limits
(Note 8) (Note 9)
FAN RPM-to-DIGITAL CONVERTER
Fan RPM Error
Full-scale Count
+25˚C ≤ TA ≤ +75˚C
−10˚C ≤ TA ≤ +100˚C
−25˚C ≤ TA ≤ +125˚C
±10
±15
±20
255
FAN1 and FAN2 Nominal Input
RPM (See Section 6.0)
Divisor = 1, Fan Count = 153
(Note 12)
8800
Divisor = 2, Fan Count = 153
(Note 12)
4400
Divisor = 3, Fan Count = 153
(Note 12)
2200
Divisor = 4, Fan Count = 153
(Note 12)
1100
Internal Clock Frequency
+25˚C ≤ TA ≤ +75˚C
22.5
20.2
24.8
−10˚C ≤ TA ≤ +100˚C
22.5
19.1
25.9
−25˚C ≤ TA ≤ +125˚C
22.5
18
27
DIGITAL OUTPUTS: A0/NTEST_OUT, INT
VOUT(1) Logical “1” Output Voltage
IOUT = +5.0 mA at
V+ = +4.25V, IOUT = +3.0 mA
at V+ = +2.8V
2.4
VOUT(0) Logical “0” Output Voltage
IOUT = −5.0 mA at
V+ = +5.75V, IOUT = −3.0 mA
at V+ = +3.8V
0.4
OPEN DRAIN OUTPUTS: GPO, RST_OUT/OS, CI
VOUT(0) Logical “0” Output Voltage
IOH High Level Output Current
RST_OUT/OS, CI
IOUT =− 5.0 mA
at V+ = +5.75V,
IOUT = −3.0 mA at V+ = +3.8V
VOUT = V+
0.1
30
0.4
100
10
Pulse Width
OPEN DRAIN SERIAL BUS OUTPUT: SDA
VOUT(0) Logical “0” Output Voltage
VIO+U=T
= −3.0 mA at
+5.75V, IOUT
=
−3.0
mA
at V+ = +3.8V
0.4
IOH High Level Output Current
VOUT = V+
0.1 100
DIGITAL INPUTS: A0/NTEST_Out, A1-A2, BTI, CI (Chassis Intrusion), INT_IN, and NTEST_IN/Reset_IN
VIN(1) Logical “1” Input Voltage
VIN(0) Logical “0” Input Voltage
SERIAL BUS INPUTS (SCL, SDA) and FAN TACH PULSE INPUTS (FAN1, FAN2)
2.0
0.8
VIN(1) Logical “1” Input Voltage
VIN(0) Logical “0” Input Voltage
ALL DIGITAL INPUTS Except for BTI
0.7 x V+
0.3 x V+
IIN(1)
IIN(0)
CIN
Logical “1” Input Current
Logical “0” Input Current
Digital Input Capacitance
VIN = V+
VIN = 0 VDC
−0.005
0.005
20
−1
1
Units
(Limits)
% (max)
% (max)
% (max)
(max)
RPM
RPM
RPM
RPM
kHz (min)
kHz (max)
kHz (min)
kHz (max)
kHz (min)
kHz (max)
V (min)
V (max)
V (min)
µA (max)
ms (min)
V (min)
µA (max)
V (min)
V (max)
V (min)
V (max)
µA (min)
µA (max)
pF
5 www.national.com
5 Page 
Functional Description (Continued)
2.2 Serial Bus Interface
(a) Serial Bus Write to the Internal Address Register followed by the Data Byte
DS100040-8
(b) Serial Bus Write to the Internal Address Register Only
DS100040-9
DS100040-10
(c) Serial Bus Read from a Register with the Internal Address Register Preset to Desired Location
FIGURE 5. Serial Bus Timing
The Serial Bus control lines consists of the SDA (serial data),
SCL (serial clock) and A0-A1 (address) pins. The LM80 can
only operate as a slave. The SCL line only controls the serial
interface, all other clock functions within LM80 such as the
ADC and fan counters are done with a separate asynchro-
nous internal clock.
When using the Serial Bus Interface a write will always con-
sist of the LM80 Serial Bus Interface Address byte, followed
by the Internal Address Register byte, then the data byte.
There are two cases for a read:
1. If the Internal Address Register is known to be at the de-
sired Address, simply read the LM80 with the Serial Bus
Interface Address byte, followed by the data byte read
from the LM80.
2. If the Internal Address Register value is unknown, write
to the LM80 with the Serial Bus Interface Address byte,
followed by the Internal Address Register byte. Then re-
start the Serial Communication with a Read consisting of
the Serial Bus Interface Address byte, followed by the
data byte read from the LM80.
The default power on Serial Bus address for the LM80 is:
0101(A2)(A1)(A0) binary, where A0-A2 reflect the state of
the pins defined by the same names.
All of these communications are depicted in the Serial Bus
Interface Timing Diagrams as shown in Figure 5.
11 www.national.com
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet LM80.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LM80 | Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor | National Semiconductor |
| LM80 | Diode (spec sheet) |  American Microsemiconductor |
| LM80 | LM80 Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor (Rev. F) |  Texas Instruments |
| LM8002 | 3W Audio Power Amplifier |  HONGLIFA ELECTRONICS |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |