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參數(shù)資料
| 型號： | G766 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Remote Temperature Sensor with SMBus Serial Interface |
| 中文描述： | 遠程溫度傳感器，帶有SMBus串行接口 |
| 文件頁數(shù)： | 5/13頁 |
| 文件大小： | 248K |
| 代理商： | G766 |
Ver 1.0
Dec 11, 2001
TEL: 886-3-5788833
http://www.gmt.com.tw
5
Global Mixed-mode Technology Inc.
G766
Figure 1. Functional Diagram
A/D Conversion Sequence
If a Start command is written (or generated automati-
cally in the free-running auto-convert mode), both
channels are converted, and the results of both meas-
urements are available after the end of conversion. A
BUSY status bit in the status byte shows that the de-
vice is actually performing a new conversion; however,
even if the ADC is busy, the results of the previous
conversion are always available.
Remote-Diode Selection
Temperature
good-quality, diode-connected small-signal transistor.
Accuracy has been experimentally verified for all of the
devices listed in Table 1. The G766 can also directly
measure the die temperature of CPUs and other inte-
accuracy
depends
on
having
a
grated circuits having on-board temperature-sensing
diodes.
The transistor must be a small-signal type with a rela-
tively high forward voltage; otherwise, the A/D input
voltage range can be violated. The forward voltage
must be greater than 0.25V at 10μA; check to ensure
this is true at the highest expected temperature. The
forward voltage must be less than 0.95V at 100μA;
check to ensure this is true at the lowest expected
temperature. Large power transistors don’t work at all.
Also, ensure that the base resistance is less than
100
. Tight specifications for forward-current gain
(+50 to +150, for example) indicate that the manufac-
turer has good process controls and that the devices
have consistent VBE characteristics.
V
CC
DXN
MUX
+
+
+
REMOTE
LOCAL
ADC
LOGIC
STBY ADD0 ADD1
DECODER
SMBUS
7
SMBDATA
SMBCLK
READ
WRITE
FAULT
2
8
8
(INDEX) REGISTER
REGISTER
BYTE REGISTER
ADDRESS REGISTER
SLAVE ADD = 0001 100
8
8
ALERT
Q
S
R
DATA REGISTER
(REMOTE)
REGISTER
DXP
CONTROL
ADDRESS
DIODE
COMMAND BYTE
STATUS BYTE
CONFIGURATION
ALERT RESPONSE
SELECTED VIA
REMOTE TEMPERATURE
HIGH-TEMPETATURE
THRESHOLD (REMOTE
HIGH
)
LOW-TEMPETATURE
THRESHOLD (REMOTE
LOW
)
DIGITAL COMPARATOR
CONVERSION RATE
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