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PDF G751 Data sheet ( Hoja de datos )
| Número de pieza | G751 | |
| Descripción | Digital Temperature Sensor and Thermal Watchdog | |
| Fabricantes | Global Mixed-mode Technology | |
| Logotipo |  |
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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)
Applications
System Thermal Management
Personal Computers
Office Electronics
Electronic Test Equipment
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
G751-1P1
G751-2P1
G751-2P8
TOS THYST
50°C/45°C
80°C /75°C
80°C /75°C
TRANSPORT
MEDIA
2500 Units on Tape
and Reel
2500 Units on Tape
and Reel
2500 Units on Tape
and Reel
PACKAGE
8 SOP
8 SOP
8 MSOP
P1: 8 SOP; P8: 8 MSOP
Pin Configuration
Typical Application
G751
SMBDATA 1
SMBCLK 2
O.S. 3
GND 4
8 +Vs
7 A0
6 A1
5 A2
8Pin SOP/MSOP
Address(Set as
desired)
7
A0 6
A1 5
A2
1
SMBDATA
Interface SMBCLK 2
+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: 2.4
Nov 26, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
1
1 page  
Global Mixed-mode Technology Inc.
G751
*
*
*
Figure1 O.S. Output Temperature Response Diagram
Temperature Data Format
Temperature data can be read from the Temperature,
TOS Set Point, and THYST Set Point registers; and
written to the TOS Set Point, and THYST Set Point reg-
isters. Temperature data is represented
by a 9-bit, two’s complement word with an LSB
(Least Significant Bit) equal to 0.5°C:
TEMPERATURE
+125°C
+25°C
+0.5°C
0°C
-0.5°C
-25°C
-55°C
DIGITAL OUTPUT
BINARY
HEX
0 1111 1010
0FAh
0 0011 0010
032h
0 0000 0001
001h
0 0000 0000
000h
1 1111 1111
1FFh
1 1100 1110
1CEh
1 1001 0010
192h
Shutdown Mode
Shutdown mode is enabled by setting the shutdown
bit in the Configuration register via the SMBus. Shut-
down mode reduces power supply current to 1 µA
typical. In interrupt mode O.S. is reset if previously
set and is undefined in Compatator mode during
shutdown. The SMBus interface remains active. Ac-
tivity on the clock and data lines of the SMBus may
slightly increase shutdown mode quiescent current.
TOS, THYST, and Configuration registers can be read
from and written to in shutdown mode.
Fault Queue
A fault queue of up to 6 faults is provided to prevent
false tripping of O.S. when the G751 is used in noisy
environments. The number of faults set in the queue
must occur consecutively to set the O.S. output.
Comparator/Interrupt Mode
As indicated in the O.S. Output Temperature Re-
sponse Diagram, Figure 1, the events that trigger
O.S. are identical for either Comparator or Interrupt
mode. The most important difference is that in Inter-
rupt mode the O.S. will remain set indefinitely once it
has been set. To reset O.S. while in Interrupt mode,
perform a read from any register in the G751.
O.S. Output
The O.S. output is an open-drain output and does
not have an internal pull-up. A ”high” level will not be
observed on this pin until pull-up current is provided
from some external source, typically a pull-up resis-
tor. Choice of resistor value depends on many sys-
tem factors but, in general, the pull-up resistor
should be as large as possible. This will minimize
any errors due to internal heating of the G751. The
maximum resistance of the pull up, based on G751
specification for High Level Output Current, to pro-
vide a 2V high level, is 30kΩ.
O.S. Polarity
The O.S. output can be programmed via the con-
figuration register to be either active low (default
mode), or active high. In active low mode the O.S.
output goes low when triggered exactly as shown on
the O.S. Output Temperature Response Diagram,
Figure 1. Active high simply inverts the polarity of the
O.S. output.
Ver: 2.4
Nov 26, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
5
5 Page 
Global Mixed-mode Technology Inc.
8
AA
G751
E1 E
CL
1
e
0.076 C
SEATING PLANE
WITH PLATING
b
D
BASE METAL
b1
b
DETAIL “A”
A2 A
A1
GAUGE PLANE
R1
R
c1 c
θ1 L
θ2
θ3
8 Pin MSOP Package
SYMBOL
A
A1
A2
b
b1
c
c1
D
E1
e
E
L
θ1
θ2
θ3
R
R1
JEDEC
MIN.
-----
0.05
0.81
0.25
0.25
0.13
0.13
2.90
2.90
0.445
0°
0.09
0.09
DIMENSION IN MM
NOM.
-----
-----
0.86
-----
0.30
-----
0.15
3.00
3.00
0.65 BSC
4.90 BSC
0.55
-----
12 REF
12 REF
-----
-----
MAX.
1.10
0.15
0.91
0.40
0.35
0.23
0.18
3.10
3.10
MIN.
-----
0.002
0.032
0.008
0.010
0.005
0.005
0.114
0.114
0.648
6°
0.0175
0°
----- 0.004
----- 0.004
MO-187AA
DIMENSION IN INCH
NOM.
-----
-----
0.034
-----
0.012
0.006
0.118
0.118
0.026 BSC
0.193 BSC
0.0217
-----
12 REF
12 REF
-----
-----
MAX.
0.043
0.006
0.036
0.012
0.014
0.009
0.007
0.122
0.122
0.0255
6°
-----
-----
Taping Specification
Feed Direction
Typical SOP/MSOP Package Orientation
GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications.
Ver: 2.4
Nov 26, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet G751.PDF ] | |
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