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PDF LM96000CIMTX Data sheet ( Hoja de datos )
| Número de pieza | LM96000CIMTX | |
| Descripción | Hardware Monitor with Integrated Fan Control | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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November 2004
LM96000
Hardware Monitor with Integrated Fan Control
General Description
The LM96000, hardware monitor, has a two wire digital
interface compatible with SMBus 2.0. Using an 8-bit Σ∆
ADC, the LM96000 measures:
– the temperature of two remote diode connected transis-
tors as well as its own die
– the VCCP, 2.5V, 3.3VSBY, 5.0V, and 12V supplies (in-
ternal scaling resistors).
To set fan speed, the LM96000 has three PWM outputs that
are each controlled by one of three temperature zones. High
and low PWM frequency ranges are supported. The
LM96000 includes a digital filter that can be invoked to
smooth temperature readings for better control of fan speed.
The LM96000 has four tachometer inputs to measure fan
speed. Limit and status registers for all measured values are
included.
Features
n 2-wire, SMBus 2.0 compliant, serial digital interface
n 8-bit Σ∆ ADC
n Monitors VCCP, 2.5V, 3.3 VSBY, 5.0V, and 12V
motherboard/processor supplies
n Monitors 2 remote thermal diodes
n Programmable autonomous fan control based on
temperature readings
n Noise filtering of temperature reading for fan control
n 1.0˚C digital temperature sensor resolution
n 3 PWM fan speed control outputs
n Provides high and low PWM frequency ranges
n 4 fan tachometer inputs
n Monitors 5 VID control lines
n 24-pin TSSOP package
n XOR-tree test mode
Key Specifications
n Voltage Measurement Accuracy
n Resolution
n Temperature Sensor Accuracy
n Temperature Range
— LM96000 Operational
— Remote Temp Accuracy
n Power Supply Voltage
n Power Supply Current
±2% FS (max)
8-bits, 1˚C
±3˚C (max)
0˚C to +85˚C
0˚C to +125˚C
+3.0V to +3.6V
0.53 mA
Applications
n Desktop PC
n Microprocessor based equipment
(e.g. Base-stations, Routers, ATMs, Point of Sales)
Block Diagram
© 2004 National Semiconductor Corporation DS200846
20084601
www.national.com
1 page  
DC Electrical Characteristics (Continued)
The following specifications apply for V+ = 3.0V to 3.6V, and all analog input source impedance RS = 50Ω unless otherwise
specified in conditions. Boldface limits apply for TA = TJ over TMIN =0˚C to TMAX=85˚C; all other limits TA =TJ= 25˚C. TA is
the ambient temperature of the LM96000; TJ is the junction temperature of the LM96000; TD is the thermal diode junction tem-
perature.
Symbol
Parameter
Conditions
Typical Limits Units
(Note 7) (Note 8) (Limits)
Input Resistance, all analog inputs
210 140 kΩ (min)
400 kΩ (max)
DIGITAL OUTPUT: PWM1, PWM2, PWM3, XTESTOUT
IOL Logic Low Sink Current
VOL Logic Low Level
SMBUS OPEN-DRAIN OUTPUT: SMBDAT
VOL=0.4V
IOUT = +8 mA
8 mA (min)
0.4 V (max)
VOL Logic Low Output Voltage
IOH High Level Output Current
SMBUS INPUTS: SMBCLK. SMBDAT
IOUT = +4 mA
VOUT = V+
0.4V V (max)
0.1 10 µA (max)
VIH Logic Input High Voltage
VIL Logic Input Low Voltage
VHYST
Logic Input Hysteresis Voltage
DIGITAL INPUTS: ALL
2.1 V (min)
0.8 V (max)
300 mV
VIH Logic Input High Voltage
VIL Logic Input Low Voltage
VTH Logic Input Threshold Voltage
IIH Logic High Input Current
IIL Logic Low Input Current
CIN Digital Input Capacitance
VIN = V+
VIN = GND
1.5
0.005
−0.005
20
2.1 V (min)
0.8 V (max)
V
10 µA (max)
−10 µA (max)
pF
AC Electrical Characteristics
The following specifications apply for V+ = 3.0V to 3.6V unless otherwise specified in conditions. Boldface limits apply for TA
= TJ over TMIN =0˚C to TMAX=85˚C; all other limits TA =TJ= 25˚C.
Symbol
Parameter
Conditions
Typical Limits Units
(Note 7) (Note 8) (Limits)
TACHOMETER ACCURACY
Fan Count Accuracy
±10 % (max)
Fan Full-Scale Count
65536
(max)
Fan Counter Clock Frequency
90 kHz
Fan Count Conversion Time
0.7 1.4 sec (max)
FAN PWM OUTPUT
Frequency Setting Accuracy
±10 % (max)
Frequency Range
10 Hz
30 kHz
Duty-Cycle Range
Low frequency range
0 to 100 % (max)
Duty-Cycle Resolution (8-bits)
0.390625
%
Spin-Up Time Interval Range
100 ms ms
4000
Spin-Up Time Interval Accuracy
±10 % (max)
SPIKE SMOOTHING FILTER
Time Interval Deviation
±10 % (max)
Time Interval Range
35 sec
0.8 sec
SMBUS TIMING CHARACTERISTICS
fSMB
SMBus Operating Frequency
10 kHz (min)
100 kHz (max)
5 www.national.com
5 Page 
Functional Description (Continued)
Register Read/ Register
Address Write Name
6Fh R/W XOR Test Tree Enable
74h R/W Tach Monitor Mode
75h R/W Fan Spin-up Mode
Note: Reserved bits will always return 0 when read.
Bit 7 Bit 6 Bit 5 Bit 4
(MSB)
RES RES RES RES
RES RES T3/4-1 T3/4-0
RES RES RES RES
Bit 3
RES
T2-1
RES
Bit 2
RES
T2-0
PWM3
SU
Bit 1
RES
T1-1
PWM2
SU
Bit 0
(LSB)
XEN
T1-0
PWM1
SU
Default Lock?
Value
00h U
00h
7h U
4.1 Register 20-24h: Voltage Reading
Register
Address
20h
21h
22h
23h
24h
Read/
Write
R
R
R
R
R
Register
Name
2.5V
VCCP
3.3V
5V
12V
Bit 7
(MSB)
7
7
7
7
7
Bit 6
6
6
6
6
6
Bit 5
5
5
5
5
5
Bit 4
4
4
4
4
4
Bit 3
3
3
3
3
3
Bit 2
2
2
2
2
2
Bit 1
1
1
1
1
1
Bit 0
(LSB)
0
0
0
0
0
Default
Value
N/A
N/A
N/A
N/A
N/A
The Register Names difine the typical input voltage at which the reading is 3⁄4 full scale or C0h.
The Voltage Reading registers are updated automatically by the LM96000 at a minimum frequency of 4 Hz. These registers are
read only — a write to these registers has no effect.
4.2 Register 25-27h: Temperature Reading
Register
Address
25h
26h
27h
Read/
Write
R
R
R
Register
Name
Processor (Zone1) Temp
Internal (Zone2) Temp
Remote (Zone3) Temp
Bit 7
(MSB)
7
7
7
Bit 6
6
6
6
Bit 5
5
5
5
Bit 4
4
4
4
Bit 3
3
3
3
Bit 2
2
2
2
Bit 1
1
1
1
Bit 0
(LSB)
0
0
0
Default
Value
N/A
N/A
N/A
The Temperature Reading registers reflect the current temperatures of the internal and remote diodes. Processor (Zone1) Temp
register reports the temperature measured by the thermal diode connected to the Remote1− and Remote1+ pins, Remote
(Zone3) Temp register reports the temperature measured by the thermal diode connected to the the Remote2− and Remote2+
pins, and the Internal (Zone2) Temp register reports the temperature measured by the internal (junction) temperature sensor.
Temperatures are represented as 8 bit, 2’s complement, signed numbers, in Celsius, as shown below in Table 1. The Temperature
Reading register will return a value of 80h if the remote diode pins are not used by the board designer or are not functioning
properly. This reading will cause the zone limit bit(s) (bits 6 and 4) in the Interrupt Status Register (41h) and the remote diode fault
status bit(s) (bit 6 or 7) in the Interrupt Status Register 2 (42h) to be set. The Temperature Reading registers are updated
automatically by the LM96000 at a minimum frequency of 4 Hz. These registers are read only — a write to these registers has
no effect.
TABLE 1. Temperature vs Register Reading
Temperature
−127˚C
.
.
.
−50˚C
Reading (Dec)
−127
.
.
.
−50
Reading (Hex)
81h
.
.
.
CEh
11 www.national.com
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet LM96000CIMTX.PDF ] | |
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