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G766 Datasheet(PDF) 5 Page - List of Unclassifed Manufacturers

Part No. G766
Description  Remote Temperature Sensor with SMBus Serial Interface
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Manufacturer  ETC1 [List of Unclassifed Manufacturers]
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G766 Datasheet(HTML) 5 Page - List of Unclassifed Manufacturers

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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
accuracy
depends
on
having
a
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-
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
Ω. 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
DXP
DXN
MUX
+
+
+
REMOTE
LOCAL
ADC
CONTROL
LOGIC
STBY ADD0 ADD1
ADDRESS
DECODER
SMBUS
7
SMBDATA
SMBCLK
READ
WRITE
DIODE
FAULT
2
8
8
COMMAND BYTE
(INDEX) REGISTER
STATUS BYTE
REGISTER
CONFIGURATION
BYTE REGISTER
ALERT RESPONSE
ADDRESS REGISTER
SELECTED VIA
SLAVE ADD = 0001 100
8
8
ALERT
Q
S
R
REMOTE TEMPERATURE
DATA REGISTER
HIGH-TEMPETATURE
THRESHOLD (REMOTE
HIGH
)
LOW-TEMPETATURE
THRESHOLD (REMOTE
LOW
)
DIGITAL COMPARATOR
(REMOTE)
CONVERSION RATE
REGISTER
V
CC
DXP
DXN
MUX
+
+
+
REMOTE
LOCAL
ADC
CONTROL
LOGIC
STBY ADD0 ADD1
ADDRESS
DECODER
SMBUS
7
SMBDATA
SMBCLK
READ
WRITE
DIODE
FAULT
2
8
8
COMMAND BYTE
(INDEX) REGISTER
STATUS BYTE
REGISTER
CONFIGURATION
BYTE REGISTER
ALERT RESPONSE
ADDRESS REGISTER
SELECTED VIA
SLAVE ADD = 0001 100
8
8
ALERT
Q
S
R
REMOTE TEMPERATURE
DATA REGISTER
HIGH-TEMPETATURE
THRESHOLD (REMOTE
HIGH
)
LOW-TEMPETATURE
THRESHOLD (REMOTE
LOW
)
DIGITAL COMPARATOR
(REMOTE)
CONVERSION RATE
REGISTER


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