參數(shù)資料
型號(hào)： FMS2704T1C
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PDSO24
封裝： TSSOP-24
文件頁(yè)數(shù)： 1/39頁(yè)
文件大小： 173K
代理商： FMS2704T1C
www.fairchildsemi.com
REV. 1.01 12/2/99
Features
Six tachometer inputs
Two analog/PWM fan-speed outputs
Fan speed controller mode
Dual remote thermal diode inputs
Local (on-chip) temperature sense
Voltage monitoring
Serial Bus access to internal registers
Thermal Alarm output
Maskable Interrupt output
Status & Conguration registers
Integrated Reset Generators
Description
The FMS2704 is a Smart Tachometer/ Thermometer/
Voltmeter with a fan speed control mode independent of
system management software or BIOS. Outputs are two fan
control voltages, THERM alarm and interrupt INT.
Tachometer inputs are monitored continuously with speeds
compared with internal limits stored in registers. Individual
fan speeds can be sensed through the six TACH inputs.
Remote and local diode temperatures are monitored at a 1Hz
rate. Diode temperatures are digitized to 1°C resolution prior
to storage in remote and local temperature registers. Violations
of temperature limits/trip points set interrupt register bits and
assert the INT or THERM outputs.
Reset output, RST is asserted if STANDBY = L or VCC
≤
2.9/2.9/4.4V. Voltages V1-6 can be monitored in place of the
diode inputs and tachometer inputs 5 and 6.
Fan noise can be minimized using the Controller Mode to set
speed as a function of temperature. Alternatively, external
rmware/software can be used to control the fan speed volt-
ages, FAN_SPDA,B.
Supply voltages are 5.0V for the FMS2704 and 3.3V for the
FMS2704L. Performance is specied from 0 to 85°C. Package
is a 24-lead TSSOP
Block Diagram
8-bit DAC
Converters
Interrupt
Status
Registers
Mask
Gating
Configuration
Register
Voltage/
Temperature
Comparators
DSP
Trip & Limit
Registers
Interrupt
Mask
Register
INT
THERM
VCC
Analog/
PWM
RST
STANDBY
FAN_SPDB
TACHB2
TACHA2
TACHB1
TACHA3/V5
TACHB3/V6
TACHA1
Current
Generators
On-chip
Temperature
Sensor
Mux
A/D
Converter
Main Reset
Oscillator
3.58 MHz
Oscillator
Timing
and Control
Internal Reset
DXP1/V1
Low-pass
Filter
DXN1/V2
DXP2/V3
Low-pass
Filter
DXN2/V2
SMBus
Interface
SDA
OSC1
SCL
OSC2
ADD
Internal Bus
8-bit DAC
Converters
FAN_SPDA
D/A
Registers
Tachometers
Fan Speed
Controller
TL, TR
V5/V6
FMS2704/FMS2704L
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