MAX6633(2001) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX6633
(Rev.:2001)

12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface

Maxim Integrated 

12-Bit Plus Sign Temperature Sensors with

SMBus/I2C-Compatible Serial Interface

A

B

C

D

EF

G

tLOW tHIGH

SMBCLK

SMBDATA

tSU:STA tHD:STA

tSU:DAT

A = START CONDITION

B = MSB OF ADDRESS CLOCKED INTO SLAVE

C = LSB OF ADDRESS CLOCKED INTO SLAVE

D = R/W BIT CLOCKED INTO SLAVE

E = SLAVE PULLS SMBDATA LINE LOW

F = ACKNOWLEDGE BIT CLOCKED INTO MASTER

G = MSB OF DATA CLOCKED INTO MASTER

H = LSB OF DATA CLOCKED INTO MASTER

Figure 3. SMBus Read Timing Diagram

0.25s ADC CONVERSION TIME

MAX6633/MAX6634/MAX6635

CONVERSION PERIOD 0.5s

MAX6633/MAX6634/MAX6635

H

IJ

K

L

M

I = MASTER PULLS DATA LINE LOW

J = ACKNOWLEDGE CLOCKED INTO SLAVE

K = ACKNOWLEDGE CLEAR PULSE

tSU:STO tBUF

L = STOP CONDITION, DATA

EXECUTED BY SLAVE

M = NEW START CONDITION

Figure 4. ADC Conversion Timing Diagram

The Configuration register is 8 bits, read/write, and

contains the SMBus timeout disable bit, fault queue

enable bit, the temperature alarm output polarity select

bits, the interrupt mode select bit, and the shutdown

bit. Registers THIGH and TLOW are 16 bits, read/write,

and contain the values that trigger ALERT. Register

THYST is 16 bits, read/write, and contains the values by

which the temperature must rise or fall beyond THIGH or

TLOW, before ALERT deasserts.

Control Registers (MAX6635)

Seven registers control the operation of the MAX6635

(Figure 7 and Tables 2 through 7). The Pointer register

is the first addressed and determines which of the other

six registers is acted upon. The other six are the

Temperature, Configuration, High-Temperature

(THIGH), Low-Temperature (TLOW), Maximum

Temperature (TMAX), and Hysteresis (THYST) registers.

The temperature value is stored as 12 bits plus a sign

bit, read only, and contains the latest temperature data.

The true register length is 16 bits, with the lower three

used as status bits. The digital temperature data con-

tained in the temperature register is in °C, using a

two’s-complement format with 1LSB corresponding to

0.0625°C.

VCC

12 BIT + SIGN

ADC

CONFIGURATION TEMPERATURE

SDA

SCL

SMBus INTERFACE

A0

A1

A2

A3

The Configuration register is 8 bits, read/write, and

contains the SMBus timeout disable bit, fault queue

enable bit, the temperature alarm output polarity select

bits, the interrupt mode select bit, and the shutdown

Figure 5. MAX6633 Functional Diagram

_______________________________________________________________________________________ 7

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