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

Global Mixed-mode Technology Inc.

G751

Digital Temperature Sensor and Thermal Watchdog with Two-Wire Interface

General Description

Features

SMBus interface



Programmable Trip Point (TOS) and Hysteresis



(T

)

HYST

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 3.0V to 5.5V



Supply Current operating 280µA (typ)



1mA (max)

shutdown 2µA(typ)

Temperature Accuracy



-25°C to 100°C ±2°C (max)

-55°C to 125°C ±3°C (max)

Applications

System Thermal Management



Personal Computers



Office Electronics



Electronic Test Equipment



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

OS

). In addition, the

HYST

OS

registers. The sensor powers up in Com-

OS

for G751-1 and 80°C T

, 75°C T

OS

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

1

2

3

45

8Pin SOP/MSOP

8

+Vs

8

+Vs

A0

7

6

A1

A2

Address(Set as

desired)

Interface

1

A0

A1

A2

SMBDATA

SMBCLK

+VS 3V to 5.5V

7

6

5

1

2

8

3

G751

4

3

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

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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.

T

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

T

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)

25

0.

1

A=TJ=TMIN

°C (max)

Bits

Ms

Ma

mA (max)

µA

V (max)

to

Block Diagram

Ver: 2.4

Nov 26, 2002

+VS3.0V - 5.5V

8

Temperat ure

3

O.S.

Threshold

T

HYST

Register

Threshold

Set Point

Comparator

Reset

9-Bit Delta-Sigma

Analog-to-Digital

Converter

Silicon

Bandgap

Temperat ure

Sensor

7

A0

6

A1

5

A2

Configuration

Register

Two-Wire Interface

T

Pointer

Register

Set Point

OS

Register

4

O.S.

1

SMBDATA

SMBDATA SMBCLK

SMBCLK

2

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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.

T

MAX

SYMBOL PARAMETER CONDITIONS TYPICAL LIMITS UNITS

V

Logical “1” Input Voltage

IN (1)

V

Logical “0” Input Voltage

IN (0)

I

Logical “1”Intput Current VIN=5V 0.005

IN (1)

I

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

A

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 =

L

MIN

to T

; all other limits TA = TJ = +25°C,

MAX

A=TJ=TMIN

V (min)

V (max)

V (min)

V (max)

µA

PF

µA (max)

V (max)

ns (max)

to

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

t

1

SMBCLK

t

5

SMBDATA

Data in

t

4

5

Ver: 2.4

Nov 26, 2002

SMBDATA

Data out

t

2

t

3

Logic Electrical Characteristics

3

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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

OS

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

OS

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.

OS

HYST

OS

,

+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

OS

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

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Shutdown Mode

*

Shutdown mode is enabled by setting the shutdown bit in the Configuration register via the SMBus. Shutdown 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. Activity on the clock and data lines of the SMBus may slightly increase shutdown mode quiescent current. T

, T

OS

HYST

from and written to in shutdown mode.

G751

, and Configuration registers can be read

Time

*

OS

T

HYST

T

O.S.

(Comparator Mode)

O.S.

(Interrupt Mode)

Time

active lo w.

Shown for O.S. set for

Temperature response

*read any register or placed in shut down

Figure1 O.S. Output Temperature Response Diagram

Temperature Data Format

Temperature data can be read from the Temperature, T

Set Point, and T

OS

written to the T

Set Point, and T

OS

Set Point registers; and

HYST

Set Point reg-

HYST

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

DIGITAL OUTPUT

BINARY HEX

+125°C 0 1111 1010 0FAh

+25°C 0 0011 0010 032h

+0.5°C 0 0000 0001 001h

0°C 0 0000 0000 000h

-0.5°C 1 1111 1111 1FFh

-25°C 1 1100 1110 1CEh

-55°C 1 1001 0010 192h

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 Response Diagram, Figure 1, the events that trigger O.S. are identical for either Comparator or Interrupt mode. The most important difference is that in Interrupt 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 resistor. Choice of resistor value depends on many system 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 provide a 2V high level, is 30kΩ.

O.S. Polarity

The O.S. output can be programmed via the configuration 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

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Internal Register Structure

Global Mixed-mode Technology Inc.

SMBDATA

SMBCLK

Temperature

(Read-only)

Pointer = 00000000

Interface

AddressData

Pointer Register

(Selects register for

communication

Register Select

Configuration

(Read-write, sets operating

Mode)

Pointer = 00000001

G751

TOS Set Point

(Read-write)

Pointer = 00000011

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 location it was set to. In Interrupt Mode, a read from the G751, or placing the device in shutdown mode, resets 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 Configuration register requires one data byte, and the T T

registers require two data bytes.

HYST

OS

and

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.

THYST Set Point

(Read-write)

Pointer = 00000010

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 temperature condition. For instance, if the first four bits of the temperature data indicates an overtemperature condition, the host processor could immediately take action to remedy the excessive temperatures. At the end of a read, the G751 can accept either Acknowledge or No Acknowledge from the Master (No Acknowledge 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. Alternatively, the master can issue clock cycles until SDA goes high, at which time issuing a “Stop” condition will reset the G751.

SMBCLK

SMBDATA

Start

by

Master

Ver: 2.4

Nov 26, 2002

A2

A1

Address Byte

A1

A0

D15 D14

D13 D12 D11 D10 D9 D8 R/W

R/W

Bit

Ack

by

G751

D13 D12 D11 D10 D9 D8

Most Si gnifica nt

Data Byter

Master but G751 locks S MBDATA low

D7

Ack

by

Master

Intended Stop b y

D6 D5 D4 D3 D2 D1 D0

Master detects the error

of its ways

Figure 2. Inadvertent 8-Bit Read from 16-Bit Register where D7 is Zero

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Stop

Ack

Cond

by

Master

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Pointer Register

(Selects which registers will be read from or written to):

P7 P6 P5 P4 P3 P2 P1 P0

0 0 0 0 0 0 Register Select

P0-P1 :Register Select:

P1 P0 REGISTER

0 0 Temperature (Read only) (Power-up default)

0 1 Configuration (Read/W rite)

1 0 T

1 1 TOS (Read/Write)

P2-P7 :Must be kept zero.

Temperature Register

(Read Only):

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

MSB Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 LSB X X X X X X X

D0-D6 :Undefined D7-D15 :Temperature Data. One LSB = 0.5°C. Two’s complement format.

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(Read/Write)

HYST

G751

Configuration Register

(Read/Write):

D7 D6 D5 D4 D3 D2 D1 D0

0 0 0 Fault Queue O.S. Polarity Cmp/Int Shutdown

Power up default is with all bits “0” (zero). D0 :Shutdown : When set to 1 the G751 goes to low power shutdown mode. D1 :Comparator / Interrupt mode : 0 is Comparator mode, 1 is Interrupt mode. D2 :O.S. Polarity : 0 is active low, 1 is active high. O.S. is an open-drain output under all conditions. D3-D4 :Fault Queue : Number of faults necessary to detect before setting O.S. output to avoid false tripping due to noise :

D4 D3 NUMBER OF FAULTS

0 0 1 (Power-up default)

0 1 2

1 0 4

1 1 6

D5-D7 :These bits are used for production testing and must be kept zero for normal operation.

T

and TOS Register

HYST

(Read/Write):

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

MSB Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 LSB X X X X X X X

D0-D6 :Undefined D7-D15 :T

Or TOS Trip Temperature Data. Power up default is TOS = 50°C /80°C for G751-1/G751-2, T

HYST

=

45°C /75°C for G751-1/G751-2.

Ver: 2.4

Nov 26, 2002

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SMBus Timing Diagrams

A1

A2

A0

A2

A0

A1

A2

A0

A2

A0

Start

by

Maste r

Start

by

Maste r

1001

Address Byte

1001

Address Byte

G751

1

91

D3

D4

D2 D1 D0

D7

D5

D6

D7

D5 D4 D3 D2 D1 D0

R/W

Ack

by

G751

91

R/W

Ack

by

G751

91

D5 D4 D3 D2 D1 D0

Most Significant Data B yte

1

Pointer Byte

1

Ack

by

Master

9

D1 D0

000000

Ack

by

G751

D5

D6

D7

Least Significant Data B yte

Least Significant Data B yteLeast Significant Data B yte

D2 D1 D0

919

No Ack

by

Master

Stop

Cond

by

Master

919

A1

Repeat

Start

by

Maste r

Start

by

Maste r

1001

Address Byte

1001

Address Byte

A1

A2

A0

A2

A0

R/W

A1

A2

A0 D1

A2

R/W

A0 D1

R/W

G751

91

Ack

G751

by

D6

D7

Ack

by

1

D6

D7

D5 D4 D3 D2 D1 D0

Most Significant Data B yte

D2

D3

D4

D5

Pointer Byte

D7

D6

D7

Ack

by

Master

9

D0

Ack

by

G751

Least Significant Data B yte

Least Significant Data B yteLeast Significant Data B yte

Stop

Cond

by

Master

D3

D4

D2 D1 D0

D5

D2 D1 D0

No Ack

by

Master

Stop

Cond

by

Master

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Timing Diagrams (Continued)

by

Stop

Cond

Master

by

Master

No Ack

9

1

9

1

9

1

No Ack

D0

D1

D2

Data Byte

Data ByteData Byte

D3

D4

D5

D6

D7

by

Ack

G751

R/W

A2 A1 A0

1

0

1

D0

D1

0

R/W

A0

A1

A2

1

0

1

Address Byte

Address ByteAddress Byte

by

Start

Master

Repeat

by

Ack

Master

Pointer Byte

by

Ack

G751

(a) Typical Pointer Set followed by Immediate Read from Configuration Register

Address Byte

9

1

9

1

9

1

G751

by

Stop

Cond

Master

by

Ack

G751

9

by

Stop

Cond

Master

by

Ack

G751

D0

D1

D2

D3

D4

Configuration Byte

0

D0

D1

00

0

R/W

A0

A2 A1

1

0

1

Configuration Byte

by

Ack

Master

Pointer Byte

(b) Configuration Register Write

by

Ack

G751

Address Byte

1

9

1

9

1

9

1

G751

D0

D5 D4 D3 D2 D1

D6

D7

D0

D1

D2

D3

D4

D5

D6

D0

D1

0

00

0

R/W

A0

A1

A2

1

0

Least Significant Data Byte

Least Significant Data ByteLeast Significant Data Byte

by

Ack

G751

Write

Most Significant Data Byte

HYST

D7

by

Ack

by

Ack

1

and T

OS

Master

OS

(c) T

Pointer Byte

G751

Address Byte

Ver: 2.4

Nov 26, 2002

by

Start

Master

by

Start

Master

by

Start

Master

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Package Information

°

7

(4X)

G751

C

E

H

L

D

θ

A2

A

y

e

B

A1

8 Pin SOP Package

Note:

1. Package body sizes exclude mold flash and gate burrs

2. Dimension L is measured in gage plane

3. Tolerance 0.10mm unless otherwise specified Controlling dimension is millimeter converted inch dimensions are not necessarily exact.

4.

SYMBOL

A 1.35 1.60 1.75 0.053 0.063 0.069

A1 0.10 ----- 0.25 0.004 ----- 0.010

A2 ----- 1.45 ----- ----- 0.057 -----

B 0.33 ----- 0.51 0.013 ----- 0.020

C 0.19 ----- 0.25 0.007 ----- 0.010

D 4.80 ----- 5.00 0.189 ----- 0.197

E 3.80 ----- 4.00 0.150 ----- 0.157

e ----- 1.27 ----- ----- 0.050 -----

H 5.80 ----- 6.20 0.228 ----- 0.244

L 0.40 ----- 1.27 0.016 ----- 0.050

y ----- ----- 0.10 ----- ----- 0.004

θ

MIN. NOM. MAX. MIN. NOM. MAX.

0º ----- 8º 0º ----- 8º

DIMENSION IN MM DIMENSION IN INCH

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8

E

E1

1

C0.076

SEATING PLANE

WITH PLATING

BASE METAL

1

e

A2

b

D

c1

b1

b

A

A1

GAUGE PLANE

c

DETAIL “A”

0.25

θ

R1

R

G751

AA

C

L

2

θ

3

θ

L

1

θ

8 Pin MSOP Package

SYMBOL

MIN. NOM. MAX. MIN. NOM. MAX.

A ----- ----- 1.10 ----- ----- 0.043 A1 0.05 ----- 0.15 0.002 ----- 0.006 A2 0.81 0.86 0.91 0.032 0.034 0.036

b 0.25 ----- 0.40 0.008 ----- 0.012 b1 0.25 0.30 0.35 0.010 0.012 0.014

c 0.13 ----- 0.23 0.005 0.009

c1 0.13 0.15 0.18 0.005 0.006 0.007

D 2.90 3.00 3.10 0.114 0.118 0.122 E1 2.90 3.00 3.10 0.114 0.118 0.122

e 0.65 BSC 0.026 BSC

E 4.90 BSC 0.193 BSC

L 0.445 0.55 0.648 0.0175 0.0217 0.0255

1

θ θ

θ

2 3

0° ----- 6° 0

R 0.09 ----- ----- 0.004 ----- ----R1 0.09 ----- ----- 0.004 ----- -----

JEDEC MO-187AA

DIMENSION IN MM DIMENSION IN INCH

----- 6°

°

12 REF 12 REF 12 REF 12 REF

Taping Specification

Feed Direction

Typical SOP/MSOP Package Orientation

GMT Inc. d oes 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

11

TEL: 886-3-5788833

http://www.gmt.com.tw

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

Specifications and Main Features

Frequently Asked Questions

User Manual