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G751 Schematic ( PDF Datasheet ) - ETC

Teilenummer G751
Beschreibung Digital Temperature Sensor and Thermal Watchdog with Two-Wire Interface
Hersteller ETC
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Gesamt 10 Seiten
G751 Datasheet, Funktion
Global Mixed-mode Technology Inc.
G751
Digital Temperature Sensor and Thermal Watchdog
with Two-Wire Interface
Features
„SMBus interface
„Programmable Trip Point (TOS) and Hysteresis
(THYST)
„Separate open-drain output pin operates as
interrupt or comparator at output
„Register readback capability
„Power up defaults permit stand-alone opera-
tion as thermostat
„Shutdown mode to minimize power consump-
tion
„Up to 8 G751s can be connected to a single
bus
Key Specifications
„Supply Voltage
„Supply Current operating
shutdown
„Temperature Accuracy
-25°C to 100°C
-55°C to 125°C
3.0V to 5.5V
280µA (typ)
1mA (max)
2µA(typ)
±2°C (max)
±3°C (max)
General Description
The G751 is a temperature sensor, Delta-Sigma
analog-to-digital converter, and digital over- tem-
perature detector with SMBus interface. The host
can query the G751 at any time to read temperature.
The open-drain Over temperature Shutdown (O.S.)
output becomes active when the temperature ex-
ceeds a programmable limit. This pin can operate in
either “Comparator” or “Interrupt” mode.
The host can program both the temperature alarm
threshold (TOS) and the temperature at which the
alarm condition goes away (THYST). In addition, the
host can read back the contents of the G751’s TOS
and THYST registers. The sensor powers up in Com-
parator mode with default thresholds of 50°C TOS
45°C THYST. for G751-1 and 80°C TOS , 75°C THYST
for G751-2.
Ordering Information
PART TOS THYST
Transport Media PACKAGE
G751-1 50°C/45°C 2500 Units on Tape and Reel 8 SOP
G751-2 80°C /75°C 2500 Units on Tape and Reel 8 SOP
Applications
„System Thermal Management
„Personal Computers
„Office Electronics
„Electronic Test Equipment
Pin Configuration
Typical Application
G751
SMBDATA 1
SMBCLK 2
8 +Vs
7 A0
O.S. 3
6 A1
GND 4
5 A2
8Pin SOP
7
Address(Set as
desired)
A0 6
A1 5
A2
1
SMBDATA
Interface
2
SMBCLK
+VS 3V to 5.5V
8
Typical Bypass 0.1 µF
(Unless mounted close
to Processor)
G751
3 To Processor
O.S. Out Interrupt Line
4 O.S. Set for active low for
wire OR’d multiple
interrupt line
Ver: 2.2
Nov 07 2001
TEL: 886-3-5788833
http://www.gmt.com.tw
1






G751 Datasheet, Funktion
Global Mixed-mode Technology Inc.
Internal Register Structure
SMBDATA
SMBCLK
Interface
Data
Address
Temperature
(Read-only)
Pointer = 00000000
Pointer Register
(Selects register for
communication
Register Select
Configuration
(Read-write, sets operating
Mode)
Pointer = 00000001
TOS Set Point
(Read-write)
Pointer = 00000011
THYST Set Point
(Read-write)
Pointer = 00000010
G751
There are four data registers in the G751, selected
by the Pointer register. At power-up the Pointer is set
to “00”; the location for the Temperature Register.
The Pointer register latches whatever the last loca-
tion it was set to. In Interrupt Mode, a read from the
G751, or placing the device in shutdown mode, re-
sets the O.S. output. All registers are read and write,
except the Temperature register which is read only.
A write to the G751 will always include the address
byte and the Pointer byte. A write to the Configura-
tion register requires one data byte, and the TOS and
THYST registers require two data bytes.
Reading the G751 can take place either of two ways:
If the location latched in the Pointer is correct (most
of the time it is expected that the Pointer will point to
Temperature register because it will be the data
most frequently read from the G751), then the read
can simply consist of an address byte, followed by
retrieving the corresponding number of data bytes. If
the Pointer needs to be set, than an address byte,
pointer byte, repeat start, and another address byte
will accomplish a read.
SMBCLK
The first data byte is the most significant byte with
most signification bit first, permitting only as much
data as necessary to be read to determine tempera-
ture condition. For instance, if the first four bits of the
temperature data indicates an overtemperature con-
dition, the host processor could immediately take
action to remedy the excessive temperatures. At the
end of a read, the G751 can accept either Acknowl-
edge or No Acknowledge from the Master (No Ac-
knowledge is typically used as a signal for the salve
that the Master has read its last byte).
An inadvertent 8-bit read from a 16-bit register, with
the D7 bit low, can cause the G751 to stop in a state
where the SDA line is held low as shown in Figure 2.
This can prevent any further bus communication until
at least 9 additional clock cycles have occurred. Al-
ternatively, the master can issue clock cycles until
SDA goes high, at which time issuing a “Stop” condi-
tion will reset the G751.
SMBDATA
Start
by
Master
A2 A1
Address Byte
A0 R/W
Bit
D15 D14 D13 D12 D11 D10 D9 D8
D7
Ack
by
G751
Ack
by
Most Significant
Master
Data Byter
Intended Stop by
Master but G751 locks SMBDATA low
D6 D5 D4 D3 D2 D1 D0
Ack Stop
by Cond
Master by
Master
Master detects the error
of its ways
Figure 2. Inadvertent 8-Bit Read from 16-Bit Register where D7 is Zero
Ver: 2.2
Nov 07 2001
TEL: 886-3-5788833
http://www.gmt.com.tw
6

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