G751-2RD PDF资料下载(7/12 页)Digital Temperature Sensor and Thermal Watchdog with Two-Wir

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参数资料

型号：	G751-2RD
厂商：	Global Mixed-mode Technology Inc.
元件分类：	温度/湿度传感器
英文描述：	Digital Temperature Sensor and Thermal Watchdog with Two-Wire Interface
中文描述：	数字温度传感器和双线接口热看门狗
文件页数：	7/12页
文件大小：	264K
代理商：	G751-2RD

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Ver: 2.7

Dec 26, 2005

TEL: 886-3-5788833

http://www.gmt.com.tw

G751

Global Mixed-mode Technology Inc.

Logic Electrical Characteristics

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

Functional Description

The

G751

temperature

sensor

incorporates

band-gap type temperature sensor and 9-bit ADC

(Delta-Sigma Analog- to-Digital Converter). The tem-

perature 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 se-

ries

readings,

the

number

which

user-selectable, to user-programmable setpoint and

hysteresis values. The comparator trips the O.S. out-

put line, which is programmable for mode and polarity.

O.S. Output, TOS and THYST Limits

In Comparator mode the O.S. Output behaves like a

thermostat. The output becomes active when tem-

perature exceeds the TOS limit, and leaves the active

state when the temperature drops below the THYST

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 TOS also makes O.S.

active but O.S. will remain active indefinitely until

reset by reading any register via the SMBus inter-

face. Once O.S. has been activated by crossing TOS,

then reset, it can activated again only by Tempera-

ture going below THYST. Again, it will remain active

indefinitely until being reset by a read. Placing the

G751 in shutdown mode also resets the O.S. output.

Default Modes

G751 always powers up in a known state. G751

power up default conditions are:

1. Comparator mode

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

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

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 op erates as a slave on the SMBus, so

the SMBCLK line is an input (no clock is generated

the

G751)

and

the

SMBDATA

line

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 as-

signed 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:

MSB

LSB

0,1111,1010

+125°C

-55°C

-25°C

-0.5°C

0°C

+0.5°C

+25°C

Temperature

tpu

ode

0,0011,0010

0,0000,0001

0,0000,0000

1,1111,1111

1,1100,1110

1,1001,0010