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參數(shù)資料
| 型號(hào)： | 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(yuǎn)程和本地溫度傳感器，帶有SMBus串行接口 |
| 文件頁(yè)數(shù)： | 4/14頁(yè) |
| 文件大?。?/td> | 342K |
| 代理商： | G781 |
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Ver: 1.0
Oct 02, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
4
Global Mixed-mode Technology Inc.
Detailed Description
The G781 is a temperature sensor designed to work in
conjunction with an external microcontroller (μC) or
other intelligence in thermostatic, process-control, or
monitoring applications. The μC is typically a power-
management or keyboard controller, generating
SMBus serial commands by “bit-banging” general-
purpose input-output (GPIO) pins or via a dedicated
SMBus interface block.
G781
Essentially an serial analog-to digital converter (ADC)
with a sophisticated front end, the G781 contains a
switched current source, a multiplexer, an ADC, an
SMBus interface, 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 several over/under- tem-
perature alarm registers.
ADC and Multiplexer
The ADC is an averaging type that integrates over a
60ms period (each channel, typical), with excellent
noise rejection.
The multiplexer automatically steers bias currents
through the remote and local diodes, measures their
forward voltages, and computes their temperatures.
Both channels are automatically converted once the
conversion process has started, either in free-running
or single-shot mode. If one of the two channels is not
used, the device still performs both measurements,
and the user can simply ignore the results of the un-
used channel. If the remote diode channel is unused,
tie DXP to DXN rather than leaving the pins open.
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 +0.6°C error per ohm. Likewise, 240μV
of offset voltage forced on DXP-DXN causes about
1°C error.
Figure 1. Functional Diagram
V
CC
DXP
DXN
MUX
+
+
+
REMOTE
LOCAL
ADC
LOGIC
SMBUS
7
SMBDATA
SMBCLK
READ
WRITE
FAULT
2
8
8
(INDEX) REGISTER
REGISTER
BYTE REGISTER
REGISTER
ADDRESS REGISTER
8
8
DATA REGISTER
THRESHOLD (LOCALT
HIGH
)
THRESHOLD (LOCAL T
LOW
)
8
(LOCAL)
SLAVE ADD = 0001 100
11
11
ALERT
Q
S
R
DATA REGISTER
THRESHOLD (REMOTE
HIGH
)
THRESHOLD (REMOTE
LOW
)
(REMOTE)
HYSTERESIS REGISTER
11
COMPARATOR
THERM
CONTROL
DIODE
COMMAND BYTE
STATUS BYTE
CONFIGURATION
CONVERSION RATE
ALERT RESPONSE
LOCAL EMPERATURE
HIGH-TEMPETATURE
LOW-TEMPETATURE
DIGITAL COMPARATOR
SELECTED VIA
REMOTE TEMPERATURE
HIGH-TEMPETATURE
LOW-TEMPETATURE
DIGITAL COMPARATOR
THERM LIMIT AND
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