G771 Datasheet PDF - ETC
| Part Number | G771 | |
| Description | Two Remote Temperature Sensors with SMBus Serial Interface and System Reset Circuit | |
| Manufacturers | ETC | |
| Logo |  |
|
|
There is a preview and G771 download ( pdf file ) link at the bottom of this page. Total 15 Pages | ||
Preview 1 page No Preview Available !
Global Mixed-mode Technology Inc.
G771
Two Remote Temperature Sensors 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
Precision Monitoring of 5V Power-Supply
Voltage
140ms Min 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
General Description
The G771 contains a precise digital thermometer, a
system-reset circuit, and a programmable thermal
shutdown 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.
Ordering Information
PART*
G771
TEMP. RANGE
-55°C to +125°C
PIN-PACKAGE
16SSOP
Pin Configuration
NC 1
Vcc 2
DXP1 3
DXN 4
DXP2 5
NC 6
DGND 7
AGND 8
G771
16 TH_SHUT(push-pull)
15 NC
14 SMBCLK
13 NC
12 SMBDATA
11 ALERT
10 NC
9 RESET
16Pin SSOP
Ver 0.2 Preliminary
Dec 11, 2001
TEL: 886-3-5788833
http://www.gmt.com.tw
1
|
| |
 
Global Mixed-mode Technology Inc.
G771
Detailed Description
The G771 (patents pending) consists of two tempera-
ture sensors, one on-chip temperature sensor and
provides system-reset function.
The temperature sensor is designed to work in con-
junction with an external micro-controller (µC) or other
intelligence in thermostatic, process-control, or moni-
toring applications. The µC is typically a powerman-
agement or keyboard controller, generating SMBus se-
rial commands by "bit-banging" general-purpose in-
put-output (GPIO) pins or via a dedicated SMBus inter-
face block.
Essentially a 12-bit serial analog-to-digital converter
(ADC) with a sophisticated front end, the G771 con-
tains a switched current source, a multiplexer, an ADC,
an SMBus interface, a reset circuit and associated
control logic (Figure 1).
Temperature data from the ADC is loaded into two
data registers, where it is automatically compared with
data previously stored in four over/under-temperature
alarm registers.
ADC and Multiplexer
The ADC is an averaging type that integrates over a
60ms period (each channel, typical).
The multiplexer automatically steers bias currents
through two remote diodes, measures their forward
voltages, and computes their temperatures. All chan-
nels are converted automatically once the conversion
process has started, either in free-running or sin-
gle-shot mode. If one of the two channels is not used,
the device still performs all measurements, and the
user can simply ignore the results of the unused chan-
nel. If the remote diode channel is unused, tie DXPx to
DXN rather than leaving the pins open.
The DXN input is internally connected to the ground
node inside the chip to set up the analog to digital
(A/D) inputs for a differential measurement. The
worst-case DXP-DXN differential input voltage range
is 0.25V to 0.95V.
Excess resistance in series with the remote diode causes
about +1/2°C error per ohm. Likewise, 200µV of offset
voltage forced on DXP-DXN causes about 1°C error.
VCC
VCC
DXP1
DXP2
DXN
INTERNAL GROUND
CONTROL
LOGIC
THERMAL SHUTDOWN
LOGIC
TH_SHUT
SMBUS
REGISTERS
SMBCLK
SMBDATA
ALERT
+
+ MUX
+ ADC
RESET
CIRCUIT
RESET
Fig 1. Functional Diagram
Ver 0.2 Preliminary
Dec 11, 2001
TEL: 886-3-5788833
http://www.gmt.com.tw
5
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for G771 electronic component. |
| Information | Total 15 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ G771.PDF Datasheet ] | |
Share Link :
Electronic Components Distributor
|
An electronic components distributor is a company that sources, stocks, and sells electronic components to manufacturers, engineers, and hobbyists. |
| SparkFun Electronics | Allied Electronics | DigiKey Electronics | Arrow Electronics |
| Mouser Electronics | Adafruit | Newark | Chip One Stop |
Featured Datasheets
| Part Number | Description | MFRS |
| G771 | The function is Two Remote Temperature Sensors with SMBus Serial Interface and System Reset Circuit. ETC | |
| G775-0U | The function is Diode ( Rectifier ). American Microsemiconductor |  |
| G775-1U | The function is Diode ( Rectifier ). American Microsemiconductor | |
Semiconductors commonly used in industry:
1N4148 |
BAW56 |
1N5400 |
NE555 | | ||
Quick jump to:
G771
1N4
2N2
2SA
2SC
74H
BC
HCF
IRF
KA | ||