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GMT - Two Remote Temperature Sensors and One Fan Controller

Numéro de référence G768D
Description Two Remote Temperature Sensors and One Fan Controller
Fabricant GMT 
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G768D fiche technique
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Global Mixed-mode Technology Inc.
G768D
Two Remote Temperature Sensors and One Fan Con-
troller with SMBus Serial Interface and System Reset
Circuit
Features
„Measures Two Remote Temperatures
„No Calibration Required
„SMBus 2-Wire Serial Interface
„Programmable Under/Over-temperature Alarms
„Programmable Thermal Shutdown Signal
„Supports SMBus Alert Response
„Accuracy: ±5°C (-40°C to + 125°C, remote)
±3°C (+60°C to + 100°C, remote)
„+4.5V to +5.5V Supply Range
„Fan speed control range: 3,000 to 30,000 rpm
„Fan speed accuracy: ±2%
„Built-in MOSFET switch
„Internal current-limit and over-temperature
protection for fan control
„Watchdog for fan control
„Alarm for fan failure
„Precision Monitoring of 5V Power-Supply
Voltage
„340ms Typical Power-On Reset Pulse Width
RESET Output
„Guaranteed RESET Valid to VCC=1V
„Power Supply Transient Immunity
„No External Components needed for reset
function
„Small, 16-Pin SSOP Package
Applications
„Desktop and Notebook
„Central Office Computers
„Telecom Equipment
„Smart Battery Packs
„Test and Measurement
„LAN Servers
„Multi-Chip Modules
„Industrial Controls
Pin Configuration
General Description
The G768D contains a precise digital thermometer, a
fan controller, and a system-reset circuit.
Except for one less fan controller, G768D is backward
compatible with G768B. G768D has 2 more functions,
fan-failure detection and programmable thermal shut-
down signal.
The thermometer reports the temperature of 2 remote
sensors. The remote sensors are diode-connected
transistors typically a low-cost, easily mounted
2N3904 NPN type that replace conventional thermis-
tors or thermocouples. Remote accuracy is ±5°C for
multiple transistor manufacturers, with no calibration
needed. The remote channel can also measure the die
temperature of other ICs, such as microprocessors,
that contain an on-chip, diode-connected transistor.
The 2-wire serial interface accepts standard System
Management Bus (SMBusTM) Write Byte, Read Byte,
Send Byte, and Receive Byte commands to program
the alarm thresholds and to read temperature data.
The data format is 7 bits plus sign, with each bit cor-
responding to 1°C, in two’s-complement format.
Measurements can be done automatically and
autonomously, with the conversion rate programmed
by the user or programmed to operate in a single-shot
mode. The adjustable rate allows the user to control
the supply-current drain.
G768D also contains a fan speed controller. It connects
directly to the fans and performs closed-loop control of
the fan speed independently. The only external compo-
nent required is a 10µF capacitor per channel. It deter-
mines the current fan speed based on the fan rotation
pulses and an externally supplied 32.768KHz clock.
Ordering Information
FANVCC 1
Vcc 2
DXP1 3
DXN 4
DXP2 5
RESET 6
DGND 7
AGND 8
G768D
16 TH_SHUT
15 Vcc
14 SMBCLK
13 NC
12 SMBDATA
11 ALERT
10 FG
9 CLK
PART NUMBER TEMP. RANGE PIN-PACKAGE
G768D
-55°C to +125°C
16SSOP
16Pin SSOP
Ver: 1.2
Apr 03, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
1

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