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G781 Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers

Part No. G781
Description  Â±1°C Remote and Local Temperature Sensor with SMBus Serial Interface
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Manufacturer  ETC [List of Unclassifed Manufacturers]
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G781 Datasheet(HTML) 4 Page - List of Unclassifed Manufacturers

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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.
G781
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.
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
CONTROL
LOGIC
SMBUS
7
SMBDATA
SMBCLK
READ WRITE
DIODE
FAULT
2
8
8
COMMAND BYTE
(INDEX) REGISTER
STATUS BYTE
REGISTER
CONFIGURATION
BYTE REGISTER
CONVERSION RATE
REGISTER
ALERT RESPONSE
ADDRESS REGISTER
8
8
LOCAL EMPERATURE
DATA REGISTER
HIGH-TEMPETATURE
THRESHOLD (LOCALTHIGH )
LOW-TEMPETATURE
THRESHOLD (LOCAL TLOW )
8
DIGITAL COMPARATOR
(LOCAL)
SELECTED VIA
SLAVE ADD = 0001 100
11
11
ALERT
Q
S
R
REMOTE TEMPERATURE
DATA REGISTER
HIGH-TEMPETATURE
THRESHOLD (REMOTE HIGH)
LOW-TEMPETATURE
THRESHOLD (REMOTE LOW)
DIGITAL COMPARATOR
(REMOTE)
THERM LIMIT AND
HYSTERESIS REGISTER
11
COMPARATOR
THERM
V
CC
DXP
DXN
MUX
+
+
+
REMOTE
LOCAL
ADC
CONTROL
LOGIC
SMBUS
7
SMBDATA
SMBCLK
READ WRITE
DIODE
FAULT
2
8
8
COMMAND BYTE
(INDEX) REGISTER
STATUS BYTE
REGISTER
CONFIGURATION
BYTE REGISTER
CONVERSION RATE
REGISTER
ALERT RESPONSE
ADDRESS REGISTER
8
8
LOCAL EMPERATURE
DATA REGISTER
HIGH-TEMPETATURE
THRESHOLD (LOCALTHIGH )
LOW-TEMPETATURE
THRESHOLD (LOCAL TLOW )
8
DIGITAL COMPARATOR
(LOCAL)
SELECTED VIA
SLAVE ADD = 0001 100
11
11
ALERT
Q
S
R
REMOTE TEMPERATURE
DATA REGISTER
HIGH-TEMPETATURE
THRESHOLD (REMOTE HIGH)
LOW-TEMPETATURE
THRESHOLD (REMOTE LOW)
DIGITAL COMPARATOR
(REMOTE)
THERM LIMIT AND
HYSTERESIS REGISTER
11
COMPARATOR
THERM


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