GMT G751-2P8, G751-2P1, G751-1P1 Datasheet

Global Mixed-mode Technology Inc.

G751

Digital Temperature Sensor and Thermal Watchdog with Two-Wire Interface

General Description

Features

SMBus interface

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Programmable Trip Point (TOS) and Hysteresis

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)

HYST

Separate open-drain output pin operates as

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interrupt or comparator at output Register readback capability

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Power up defaults permit stand-alone opera-

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tion as thermostat Shutdown mode to minimize power consump-

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tion Up to 8 G751s can be connected to a single

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bus

Key Specifications

Supply Voltage 3.0V to 5.5V

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Supply Current operating 280µA (typ)

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1mA (max)

shutdown 2µA(typ)

Temperature Accuracy

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-25°C to 100°C ±2°C (max)

-55°C to 125°C ±3°C (max)

Applications

System Thermal Management

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Personal Computers

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Office Electronics

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Electronic Test Equipment

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Pin Configuration

The G751 is a temperature sensor, Delta-Sigma analog-to-digital converter, and digital over- temperature 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 exceeds a programmable limit. This pin can operate in either “Comparator” or “Interrupt” mode.

The host can program both the temperature alarm threshold (T alarm condition goes away (T host can read back the contents of the G751’s T and T

HYST

parator mode with default thresholds of 50°C T 45°C T

HYST.

) and the temperature at which the

). In addition, the

HYST

registers. The sensor powers up in Com-

for G751-1 and 80°C T

, 75°C T

HYST

for G751-2.

Ordering Information

PART T

G751-1P1 50°C/45°C

G751-2P1 80°C /75°C

G751-2P8 80°C /75°C

OS THYST

TRANSPORT

MEDIA

2500 Units on Tape and Reel

2500 Units on Tape

and Reel

PACKAGE

8 SOP

8 MSOP

P1: 8 SOP; P8: 8 MSOP

Typical Application

SMBDATA

SMBCLK

O.S.

GND

Ver: 2.4

Nov 26, 2002

G751

8Pin SOP/MSOP

+Vs

Address(Set as

desired)

Interface

SMBDATA

SMBCLK

+VS 3V to 5.5V

G751

O.S. Out

O.S. Set for active low for

O.S. Set for active low for wire OR’d multiple

wire OR’d multiple

wire OR’d multiple interrupt line

interrupt line

Typical Bypass 0.1 µF

Typical Bypass 0.1 µF (Unless mounted close

(Unless mounted close

(Unless mounted close to Processor)

to Processor)

To Processor

To Processor Interrupt Line

Interrupt Line

TEL: 886-3-5788833

http://www.gmt.com.tw

Global Mixed-mode Technology Inc.

G751

Absolute Maximum Ratings.

Supply Voltage………….…………………-0.3V to 6.5V Voltage at any Pin……………….…-0.3V to +Vs +0.3V Input Current at any Pin…………………………….5mA

Operating Ratings

Specified Temperature Range…………….T

-55°C to +125°C

Supply Voltage Range (+Vs)…………..+3.0V to +5.5V

MIN

to T

MAX

Package Input Current…………………………….20mA O.S. Output Sink Current………………………….10mA O.S. Output Voltage…………………….…………..6.5V Storage Temperature…………………-65°C to +150°C Soldering Information, Lead Temperature SOP Package Vapor Phase (60 seconds)……………………….215°C Infrared (15 seconds)……………………………..220°C ESD Susceptibility Human Body Model……………………………….2000V Machine Model……………………………………...200V

Temperature-to-Digital Converter Characteristics

Unless otherwise noted, these specifications apply for +Vs=+3.3v Vdc.

; all other limits TA=TJ= +25°C, unless otherwise noted.

MAX

PARAMETER CONDITIONS TYPICAL LIMITS UNITS

Accuracy

Resolution 9

Temperature Conversion Time 100

Quiescent Current

O.S. Output Saturation Voltage I

O.S. Delay

TOS Default Temperature G751-1/G751-2 50/80 °C

Default Temperature G751-1/G751-2 45/75 °C

HYST

TA=-25°C to +100°C TA=-55°C to +125°C

SMBus Inactive

SMBus Active

Shutdown Mode

= 4.0mA

OUT

Boldface limits apply for T

± ±

1.0

0.8

2.0

3.0

1 6

Conversions (min)

Conversions (max)

A=TJ=TMIN

°C (max)

Bits

mA (max)

µA

V (max)

Block Diagram

Ver: 2.4

Nov 26, 2002

+VS3.0V - 5.5V

Temperat ure

O.S.

Threshold

HYST

Threshold

Set Point

Comparator

Reset

9-Bit Delta-Sigma

Analog-to-Digital

Converter

Silicon

Bandgap

Temperat ure

Sensor

Configuration

Two-Wire Interface

Pointer

Set Point

O.S.

SMBDATA

SMBDATA SMBCLK

SMBCLK

TEL: 886-3-5788833

http://www.gmt.com.tw

Global Mixed-mode Technology Inc.

G751

Logic Electrical Characteristics

Digital DC Characteristics

Unless otherwise noted, these specifications apply for +Vs=+3.3 Vdc.

; all other limits TA=TJ=+25°C, unless otherwise noted.

MAX

SYMBOL PARAMETER CONDITIONS TYPICAL LIMITS UNITS

Logical “1” Input Voltage

IN (1)

Logical “0” Input Voltage

IN (0)

Logical “1”Intput Current VIN=5V 0.005

IN (1)

Logical “0”Intput Current VIN=0V -0.005

IN (0)

CIN All Digital Inputs 20

IOH High Level Output Current VOH=5V

VOL Low Level Output Voltage IOL=3ma

tOF Output Fall Time CL=400pF,IO=3ma

SMBus Digital Switching Characteristics

Unless otherwise noted, these specifications apply for +Vs = +3.3 Vdc and C 80pF unless otherwise specified.

Boldface limits apply for T

= TJ = T

unless otherwise noted. The switching characteristics of the G751 fully meet or exceed the published specifications of the SMBus. The following parameters are the timing relationships between SMBCLK and SMBDATA signals related to the G751. They are not the SMBus specifications.

Boldface limits apply for T

××××

+Vs

0.7

+Vs + 0.5

-0.3

××××

+Vs

0.3

1.0

-1.0

100

0.4

250

(load capacitance) on output lines =

MIN

to T

; all other limits TA = TJ = +25°C,

MAX

A=TJ=TMIN

V (min)

V (max)

V (min)

V (max)

µA

µA (max)

V (max)

ns (max)

SYMBOL PARAMETER CONDITIONS TYPICAL LIMITS UNITS

t1 SMBCLK (Clock) Period 2.5 µs (min)

t2 Data in Set-Up Time to SMBCLK High 100 ns (min)

t3 Data Out Stable after SMBCLK Low 0 ns (min)

t4 SMBDATA Low Set-Up Time to SMBCLK Low (Start Condition) 100 ns (min)

t5 SMBDATA High Hold Time after SMBCLK High (Stop Condition) 100 ns (min)

Pin Description

PIN LABEL FUNCTION TYPICAL CONNECTION

1 SMBDATA SMBus Serial Bi-Directional Data Line From Controller

2 SMBCLK SMBus Clock Input From Controller

3 O.S. Overtemperature Shutdown Open Drain Output Pull Up Resistor, Controller Interrupt Line

4 GND Power Supply Ground Ground

5,6,7 A0-A2 User-Set SMBus Address Inputs Ground (Low, “0”) or +Vs (High, “1”)

8 +Vs Positive Supply Voltage Input DC Voltage from 3V to 5.5V

SMBCLK

SMBDATA

Data in

Ver: 2.4

Nov 26, 2002

SMBDATA

Data out

Logic Electrical Characteristics

TEL: 886-3-5788833

http://www.gmt.com.tw

Global Mixed-mode Technology Inc.

G751

0,1111,1010

Output Code

0,0011,0010

0,0000,0001

0,0000,0000

-25°C

+0.5°C

0°C

-0.5°C

Temperature-to-Digital Transfer Function (Non-linear scale for clarity)

Functional Description

The G751 temperature sensor incorporates a band-gap type temperature sensor and 9-bit ADC (Delta-Sigma Analog- to-Digital Converter). The temperature data output of the G751 is available at all times via the SMBus. If a conversion is in progress, it will be stopped and restarted after the read. A digital comparator is also incorporated that compares a series of readings, the number of which is user-selectable, to user-programmable setpoint and hysteresis values. The comparator trips the O.S. output line, which is programmable for mode and polarity.

O.S. Output, T

and T

HYST

Limits

In Comparator mode the O.S. Output behaves like a thermostat. The output becomes active when temperature exceeds the T

limit, and leaves the active

state when the temperature drops below the T limit. In this mode the O.S. output can be used to turn a cooling fan on, initiate an emergency system shutdown, or reduce system clock speed. Shutdown mode does not reset O.S. state in a comparator mode.

In interrupt mode exceeding T active but O.S. will remain active indefinitely until reset by reading any register via the SMBus interface. Once O.S. has been activated by crossing T then reset, it can activated again only by Temperature going below T

. Again, it will remain active

HYST

indefinitely until being reset by a read. Placing the G751 in shutdown mode also resets the O.S. output.

also makes O.S.

HYST

+25°C

1,1111,1111

1,1100,1110

1,1001,0010

Temperature

+125°C-55°C

Default Modes

G751 always powers up in a known state. G751 power up default conditions are:

1. Comparator mode

2. T

set to 50°C for G751-1, to 80°C for G751-2

3. T

set to 45°C for G751-1, to 75°C for G751-2

HYST

4. O.S. active low

5. Pointer set to “00”; Temperature Register With these operating conditions G751 can act as a stand-alone thermostat with the above temperature settings. Connection to an SMBus is not required.

SMBus Interface

The G751 operates as a slave on the SMBus, so the SMBCLK line is an input (no clock is generated by the G751) and the SMBDATA line is a bi-directional serial data path. According to SMBus specifications, the G751 has a 7-bit slave address. The four most significant bits of the slave address are hard wired inside the G751 and are “1001”. The three least significant bits of the address are assigned to pins A2-A0, and are set by connecting these pins to ground for a low, (0); or to +Vs for a high, (1).

Therefore, the complete slave address is:

1 0 0 1 A2 A1 A0

MSB LSB

Ver: 2.4

Nov 26, 2002

TEL: 886-3-5788833

http://www.gmt.com.tw

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GMT G751-2P8, G751-2P1, G751-1P1 Datasheet

Specifications and Main Features

Frequently Asked Questions

User Manual