DataSheet.jp

G767 の電気的特性と機能

G767のメーカーはGMTです、この部品の機能は「Remote/Local Temperature Sensor」です。


製品の詳細 ( Datasheet PDF )

部品番号 G767
部品説明 Remote/Local Temperature Sensor
メーカ GMT
ロゴ GMT ロゴ 




このページの下部にプレビューとG767ダウンロード(pdfファイル)リンクがあります。

Total 14 pages

No Preview Available !

G767 Datasheet, G767 PDF,ピン配置, 機能
Global Mixed-mode Technology Inc.
G767
Remote/Local Temperature Sensor with SMBus
Serial Interface
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:
±2°C (+60°C to + 100°C, local)
±3°C (-40°C to +125°C, local)
±3°C (+60°C to +100°C, remote)
„ 3µA (typ) Standby Supply Current
„ 70µA (max) Supply Current in Auto- Convert
Mode
„ +3V to +5.5V Supply Range
„ Small, 16-Pin SSOP Package
Applications
Desktop and Notebook
Computers
Smart Battery Packs
LAN Servers
Industrial Controls
Central Office
Telecom Equipment
Test and Measurement
Multi-Chip Modules
Pin Configuration
General Description
The G767 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 ±3°C for multiple
transistor manufacturers, with no calibration needed.
The remote channel can also measure the die tem-
perature 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.
The G767 is available in a small, 16-pin SSOP sur-
face-mount package.
Ordering Information
ORDER ORDER NUMBER
NUMBER (Pb free)
TEMP.
RANGE
PACKAGE
G767
G767f
-55°C to +125°C SSOP-16
Typical Operating Circuit
N.C. 1
Vcc 2
DXP 3
DXN 4
N.C. 5
ADD1 6
GND 7
GND 8
G767
SSOP-16
16 N.C
15 STBY
14 SMBCLK
13 N.C.
12 SMBDATA
11 ALERT
10 ADD0
9 N.C.
0.1 µF
3V TO 5.5V
200Ω
2N3904
Vcc STBY
DXP
DXN
2200pF
SMBCLK
SMBDATA
ALERT
ADD0 ADD1 GND
10k EACH
CLOCK
DATA
INTERRUPT
TO µC
Ver: 2.5
Dec 14, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
1

1 Page





G767 pdf, ピン配列
Global Mixed-mode Technology Inc.
Electrical Characteristics (continued)
(Vcc = + 3.3V, TA = 0 to +85°C, unless otherwise noted.)
PARAMETER
CONDITIONS
SMBus Interface
Logic Input High Voltage
STBY , SMBCLK, SMBDATA; Vcc = 3V to 5.5V
Logic Input Low Voltage
STBY , SMBCLK, SMBDATA; Vcc = 3V to 5.5V
Logic Output Low Sink Current
ALERT , SMBDATA forced to 0.4V
ALERT Output High Leakage Current
ALERT forced to 5.5V
Logic Input Current
SMBus Input Capacitance
Logic inputs forced to Vcc or GND
SMBCLK, SMBDATA
SMBus Clock Frequency
(Note 4)
SMBCLK Clock Low Time
SMBCLK Clock High Time
SMBus Start-Condition Setup Time
tLOW , 10% to 10% points
tHIGH , 90% to 90% points
SMBus Repeated Start-Condition Setup Time
SMBus Start-Condition Hold Time
SMBus Start-Condition Setup Time
SMBus Data Valid to SMBCLK Rising-Edge
Time
tSU : STA , 90% to 90% points
tHD: STA , 10% of SMBDATA to 90% of SMBCLK
tSD: STO , 90% of SMBDATA to 10% of SMBDATA
tSU: DAT , 10% or 90% of SMBDATA to 10% of
SMBCLK
SMBus Data-Hold Time
SMBCLK Falling Edge to SMBus Data-Valid
Time
tHD : DAT (Note 5)
Master clocking in data
G767
MIN TYP MAX UNITS
2.2 --- --- V
--- --- 0.8 V
6 --- --- mA
--- --- 1 µA
-1 --- 1 µA
--- 5 --- pF
DC --- 100 kHz
4.7 --- --- µs
4 --- --- µs
4.7 --- --- µs
500 --- --- ns
4 --- --- µs
4 --- --- µs
800 --- --- ns
0 --- --- µs
--- --- 1 µs
Electrical Characteristics
(Vcc = + 3.3V, TA = -5.5 to + 125°C, unless otherwise noted.) (Note 6)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
ADC and power supply
Temperature Resolution (Note 1)
Monotonicity guaranteed
8 --- --- Bits
Initial Temperature Error, Local
Diode (Note 2)
Temperature Error, Remote Diode
(Notds2 and 3)
Supply-Voltage Range
TA = +60°C to +100°C
TA = -55°C to +125°C
TR = +60°C to +100°C
TR = -55°C to +125°C
-2 --- 2
-3 --- 3
-3 --- 3
-5 --- 5
3.0 --- 5.5
°C
°C
V
Conversion Time
From stop bit to conversion complete (both channels) 94 125 156 ms
Conversion Rate Timing Error
Auto-convert mode
-25 --- 25 %
SMBus Interface
Logic Input High Voltage
STBY, SMBCLK, SMBDATA
Vcc = 3V
Vcc = 5.5V
2.2 ---
2.4 ---
---
---
V
Logic Input Low Voltage
STBY, SMBCLK, SMBDATA; Vcc = 3V to 5.5V
--- --- 0.8 V
Logic Output Low Sink Current
ALERT, SMBDATA forced to 0.4V
6 --- --- mA
ALERT Output High Leakage Current
ALERT forced to 5.5V
--- --- 1 µA
Logic Input Current
Logic inputs forced to Vcc or GND
-2 --- 2 µA
Note1: Guaranteed but not 100% tested.
Note2: Quantization error is not included in specifications for temperature accuracy. For example, if the G767 de-
vice temperature is exactly +66.7°C, or +68°C (due to the quantization error plus the +1/2°C offset used
for rounding up) and still be within the guaranteed ±1°C error limits for the +60°C to 100°C temperature
range. See Table2.
Note3: A remote diode is any diode-connected transistor from Table1. TR is the junction temperature of the re-
mote of the remote diode. See Remote Diode Selection for remote diode forward voltage requirements.
Note4: The SMBus logic block is a static design that works with clock frequencies down to DC. While slow operation is
possible, it violates the 10kHz minimum clock frequency and SMBus specifications, and may monopolize the bus.
Note5: Note that a transition must internally provide at least a hold time in order to bridge the undefined region
(300ns max) of SMBCLK’s falling edge.
Note6: Specifications from -55°C to +125°C are guaranteed by design, not production tested.
Ver: 2.5
Dec 14, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
3


3Pages


G767 電子部品, 半導体
Global Mixed-mode Technology Inc.
G767
Self-heating does not significantly affect measurement
accuracy. Remote-sensor self-heating due to the diode
current source is negligible. For the local diode, the
worst-case error occurs when auto-converting at the
fastest rate and simultaneously sinking maximum cur-
rent at the ALERT output. For example, at an 8Hz rate
and with ALERT sinking 1mA, the typical power dissi-
pation is Vcc x 450µA plus 0.4V x 1mA. Package theta
J-A is about 150°C /W, so with Vcc = 5V and no copper
PC board heat-sinking, the resulting temperature rise is:
dT = 2.7mW x 150°C /W = 0.4°C
Even with these contrived circumstances, it is difficult
to introduce significant self-heating errors.
Table 1. Remote-Sensor Transistor Manufacturers
MANUFACTURER
MODEL NUMBER
Philips
PMBS3904
Motorola(USA)
MMBT3904
National Semiconductor(USA)
MMBT3904
Note:Transistors must be diode-connected (base
shorted to collector).
ADC Noise Filtering
The ADC is an integrating type with inherently good
noise rejection, especially of low-frequency signals
such as 60Hz/120Hz power-supply hum. Micropower
operation places constraints on high-frequency noise
rejection; therefore, careful PC board layout and prop-
er external noise filtering are required for
high-accuracy remote measurements in electrically
noisy environments.
High-frequency EMI is best filtered at DXP and DXN
with an external 2200pF capacitor. This value can be
increased to about 3300pF(max), including cable ca-
pacitance. Higher capacitance than 3300pF introduces
errors due to the rise time of the switched current
source.
Do not route the DXP-DXN lines next to the deflection
coils of a CRT. Also, do not route the traces across a
fast memory bus, which can easily introduce +30°C
error, even with good filtering, Otherwise, most noise
sources are fairly benign.
Route the DXP and DXN traces in parallel and in close
proximity to each other, away from any high-voltage
traces such as +12VDC. Leakage currents from PC
board contamination must be dealt with carefully,
since a 20Mleakage path from DXP to ground
causes about +1°C error.
Connect guard traces to GND on either side of the
DXP-DXN traces (Figure 2). With guard traces in place,
routing near high-voltage traces is no longer an issue.
Route through as few vias and crossunders as
possible to minimize copper/solder thermocouple ef-
fects.
When introducing a thermocouple, make sure that
both the DXP and the DXN paths have matching
thermocouples. In general, PC board-induced ther-
mocouples are not a serious problem, A copper-solder
thermocouple exhibits 3µV/°C, and it takes about
200µV of voltage error at DXP-DXN to cause a +1°C
measurement error. So, most parasitic thermocouple
errors are swamped out.
Use wide traces. Narrow ones are more inductive and
tend to pick up radiated noise. The 10 mil widths and
spacing recommended on Figure 2 aren’t absolutely
necessary (as they offer only a minor improvement in
leakage and noise), but try to use them where practi-
cal.
Keep in mind that copper can’t be used as an EMI
shield, and only ferrous materials such as steel work
will. Placing a copper ground plane between the
DXP-DXN traces and traces carrying high-frequency
noise signals does not help reduce EMI.
Nearly all noise sources tested cause the ADC meas-
urements to be higher than the actual temperature,
typically by +1°C to 10°C, depending on the frequency
and amplitude (see Typical Operating Characteristics).
PC Board Layout
Place the G767 as close as practical to the remote
diode. In a noisy environment, such as a computer
motherboard, this distance can be 4 in. to 8 in. (typical)
or more as long as the worst noise sources (such as
CRTs, clock generators, memory buses, and ISA/PCI
buses) are avoided.
PC Board Layout Checklist
„ Place the G767 close to a remote diode.
„ Keep traces away from high voltages (+12V bus).
„ Keep traces away from fast data buses and CRTs.
„ Use recommended trace widths and spacing.
„ Place a ground plane under the traces
„ Use guard traces flanking DXP and DXN and con
necting to GND.
„ Place the noise filter and the 0.1µF Vcc bypass
capacitors close to the G767.
„ Add a 200resistor in series with Vcc for best
noise filtering (see Typical Operating Circuit).
Ver: 2.5
Dec 14, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
6

6 Page



ページ 合計 : 14 ページ
 
PDF
ダウンロード
[ G767 データシート.PDF ]


データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。


共有リンク

Link :


部品番号部品説明メーカ
G760A

Fan Speed PWM Controller

ETC
ETC
G766

Remote Temperature Sensor with SMBus Serial Interface

ETC
ETC
G766

Diode ( Rectifier )

American Microsemiconductor
American Microsemiconductor
G767

Remote/Local Temperature Sensor

GMT
GMT


www.DataSheet.jp    |   2020   |  メール    |   最新    |   Sitemap