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參數資料
| 型號： | G781 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | 【1∑C Remote and Local Temperature Sensor with SMBus Serial Interface |
| 中文描述： | 【1ΣC遠程和本地溫度傳感器，帶有SMBus串行接口 |
| 文件頁數： | 1/14頁 |
| 文件大小： | 342K |
| 代理商： | G781 |
Ver: 1.0
Oct 02, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
±1°C Remote and Local Temperature Sensor with
SMBus Serial Interface
G781
Features
Two Channels: Measures Both Remote and
Local Temperatures
No Calibration Required
SMBus 2-Wire Serial Interface
Programmable Under/Overtemperature Alarms
Supports SMBus Alert Response
Accuracy:
±1°C (+60°C to +100°C, remote)
±3°C (+60°C to + 100°C, local)
320μA (typ) Average Supply Current During
Conversion
+3V to +5.5V Supply Range
Small 8-Lead SO Package
Applications
Desktop and Notebook
Computers
Smart Battery Packs
LAN Servers
Industrial Controllers
Central Office
Telecom Equipment
Test and Measurement
Multi-Chip Modules
General Description
The G781 is a precise digital thermometer that reports
the temperature of both a remote sensor and its own
package. The remote sensor is a diode-connected
transistor typically a low-cost, easily mounted 2N3904
NPN type that replace conventional thermistors or
thermocouples. Remote accuracy is ±1°C with no cali-
bration needed. The remote channel can also meas-
ure the die temperature of other ICs, such as micro-
processors, that contain an on-chip, diode-connected
transistor.
The 2-wire serial interface accepts standard System
Management Bus (SMBus) Write Byte, Read Byte,
Send Byte, and Receive Byte commands to program
the alarm thresholds and to read temperature data.
The data format is 11bits plus sign, with each bit cor-
responding to 0.125°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.
The G781 is available in a small, 8-pin SOP sur-
face-mount package.
Ordering Information
PART*
G781
TEMP. RANGE
-20°C to +120°C
PIN-PACKAGE
8-SOP
Pin Configuration
Typical Operating Circuit
THERM
0.1μF
3V TO 5.5V
VCC
DXP
DXN
SMBCLK
SMBDATA
ALERT
10k
EACH
CLOCK
DATA
INTERRUPT TO μC
GND
2200pF
2N3904
DXN
8
6
5
1
2
3
4
VCC
DXP
SMBDATA
SMBCLK
GND
8 Pin SOP
G781
7
ALERT
THERM
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