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參數(shù)資料
| 型號(hào)： | G766 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類(lèi)： | 溫度/濕度傳感器 |
| 英文描述： | Remote Temperature Sensor with SMBus Serial Interface |
| 中文描述： | 遠(yuǎn)程溫度傳感器，帶有SMBus串行接口 |
| 文件頁(yè)數(shù)： | 4/13頁(yè) |
| 文件大小： | 248K |
| 代理商： | G766 |
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Ver 1.0
Dec 11, 2001
TEL: 886-3-5788833
http://www.gmt.com.tw
4
Global Mixed-mode Technology Inc.
Pin Description
G766
PIN
1
NAME
ADD0
FUNCTION
SMBus Slave Address Select pin
SMBus Address Select pin (Table 8). ADD0 and ADD1 are sampled upon power-up. Excess capaci-
tance (>50pF) at the address pins when floating may cause address-recognition problems.
Ground
Combined Current Sink and A/D Negative Input.
Combined Current Source and A/D Positive Input for remote-diode channel. Do not leave DXP float-
ing; tie DXP to DXN if no remote diode is used. Place a 2200pF capacitor between DXP and DXN for
noise filtering.
Supply Voltage Input , 3V to 5.5V. Bypass to GND with a 0.1μF capacitor. A 200
series resistor is
recommended but not required additional noise filtering.
Hardware Standby Input. Temperature and comparison threshold data are retained in standby mode.
Low = standby mode, high = operate mode.
SMBCLK SMBus Serial-Clock Input
SMBDATA SMBus Serial-Data Input / Output, open drain
ALERT
SMBus Alert (interrupt) Output, open drain
2
ADD1
3
4
GND
DXN
5
DXP
6
Vcc
7
STBY
8
9
10
Detailed Description
The G766 (patents pending) is a temperature sensor
designed to work in conjunction with an external mi-
crocontroller (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.
Essentially an 8-bit serial analog-to digital converter
(ADC) with a sophisticated front end, the G766 con-
tains a switched current source, a multiplexer, an ADC,
an SMBus interface, and associated control logic (Fig-
ure 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-tem-
perature alarm registers.
ADC and Multiplexer
The ADC is an averaging type that integrates over a
60ms period (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.
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.
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| G767 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:± 3oC Local / remote temperature sensor with SMBus interface.|Thermal Sensor / Detector Series |
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