MAX6633 データシートの表示（PDF） - Maxim Integrated

部品番号

コンポーネント説明

メーカー

MAX6633

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

Maxim Integrated 

MAX6633/MAX6634/

MAX6635

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

H

IJ

K

L

M

tSU:STO tBUF

I = MASTER PULLS DATA LINE LOW

L = STOP CONDITION, DATA

J = ACKNOWLEDGE CLOCKED INTO SLAVE EXECUTED BY SLAVE

K = ACKNOWLEDGE CLEAR PULSE

M = NEW START CONDITION

0.25s ADC CONVERSION TIME

MAX6633/MAX6634/MAX6635

CONVERSION PERIOD 0.5s

MAX6633/MAX6634/MAX6635

Figure 4. ADC Conversion Timing Diagram

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

tains 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,

VCC

read/write, and contains the values by which the tem-

perature 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 regis-

12 BIT + SIGN

ADC

ter 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 tem-

perature value is stored as 12 bits plus a sign bit, read

only, and contains the latest temperature data. The true

CONFIGURATION TEMPERATURE

SDA

SCL

SMBus INTERFACE

A0

A1

A2

A3

register length is 16 bits, with the lower three used as

status bits. The digital temperature data contained in the

temperature register is in °C, using a two's-complement

format with 1 LSB corresponding to 0.0625°C.

Figure 5. MAX6633 Functional 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

www.maximintegrated.com

Maxim Integrated │  7

Share Link: