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G767 Datasheet(PDF) 4 Page - Global Mixed-mode Technology Inc

Part No. G767
Description  Remote/Local Temperature Sensor with SMBus Serial Interface
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Manufacturer  GMT [Global Mixed-mode Technology Inc]
Direct Link  http://www.gmt.com.tw
Logo GMT - Global Mixed-mode Technology Inc

G767 Datasheet(HTML) 4 Page - Global Mixed-mode Technology Inc

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Ver: 2.5
Dec 14, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
4
G767
Global Mixed-mode Technology Inc.
Pin Description
PIN
NAME
FUNCTION
1,5,9,13,16
N.C.
No Connection. Not internally connected. May be used for PC board trace routing
2
Vcc
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.
3
DXP
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.
4
DXN
Combined Current Sink and A/D Negative Input.
6
ADD1
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.
7,8
GND
Ground
10
ADD0
SMBus Slave Address Select pin
11
ALERT
SMBus Alert (interrupt) Output, open drain
12
SMBDATA SMBus Serial-Data Input / Output , open drain
14
SMBCLK SMBus Serial-Clock Input
15
STBY
Hardware Standby Input. Temperature and comparison threshold data are retained in standby mode.
Low = standby mode, high = operate mode.
Detailed Description
The G767 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” gen-
eral-purpose input-output (GPIO) pins or via a dedi-
cated SMBus interface block.
Essentially an 8-bit serial analog-to digital converter
(ADC) with a sophisticated front end, the G767 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 (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 +1/2°C error per ohm. Likewise, 200µV
of offset voltage forced on DXP-DXN causes about
1°C error.


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