MAX6633 MAXIM [Maxim Integrated Products], MAX6633 Datasheet

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MAX6633

Manufacturer Part Number
MAX6633
Description
12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet

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The MAX6633/MAX6634/MAX6635 combine a tempera-
ture sensor, a programmable overtemperature alarm,
and an SMBus™/I
a single package. They convert their die temperatures
into digital values using internal analog-to-digital con-
verters (ADCs). The result of the conversion is then held
in a temperature register as a 12-bit + sign value, allow-
ing 0.0625°C resolution, readable at any time through
the serial interface. The devices are capable of reading
temperatures up to +150°C.
The MAX6633/MAX6634/MAX6635 feature a shutdown
mode that saves power by turning off everything except
the power-on reset (POR) and the serial interface. The
devices can be configured to separate addresses,
allowing multiple devices to be used on the same bus.
The MAX6633 has four address pins, allowing up to 16
devices to be connected to a single bus. The MAX6634
has three address pins, allowing up to eight devices to
be connected to a single bus. The MAX6635 has two
address pins, allowing up to four devices to be con-
nected to a single bus.
The MAX6633/MAX6634/MAX6635 make temperature
data available for transfer over the serial interface. The
MAX6634 incorporates a dual-mode ALERT output
(open drain) and can serve as an upgraded alternative
to the LM75. The MAX6635 includes an ALERT output
and an OVERT output (both open drain) and can func-
tion as an upgraded replacement for the LM76 in most
applications. The MAX6634/MAX6635 feature user-pro-
grammable temperature thresholds. All three devices
come in an 8-pin SO package.
19-2120; Rev 0; 8/01
Pin Configurations appear at end of data sheet.
SMBus is a trademark of Intel Corp.
I
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
2
C is a trademark of Philips Corp.
Battery Temperature Alarms
PC Temperature Control
Automotive Equipment
12-Bit Plus Sign Temperature Sensors with
________________________________________________________________ Maxim Integrated Products
2
C™-compatible serial interface into
SMBus/I
General Description
Applications
2
C-Compatible Serial Interface
o +3V to +5.5V Supply Range
o Accuracy
o User-Programmable Temperature Thresholds
o User-Configurable Alarm Output(s)
o Ability to Respond to SMBus/I
o OVERT Output for System Shutdown (MAX6635)
o Multiple Devices per Bus
(MAX6634/MAX6635)
(MAX6634/MAX6635)
Response Address (MAX6634/MAX6635)
MAX6633MSA
MAX6634MSA
MAX6635MSA
±1°C max (0°C to +50°C)
±1.5°C max (-20°C to +85°C)
±2.5°C max (-40°C to +125°C)
±2.5°C typ (+150°C)
16 devices (MAX6633)
8 devices (MAX6634)
4 devices (MAX6635)
0.1µF
PART
A0 A1 GND
MAX6635
7
V
CC
V
CC
8
6
+3.0V TO +5.5V
OVERT
ALERT
SDA
SCL
Typical Operating Circuit
4
5
1
2
3
-55°C to +150°C
-55°C to +150°C
-55°C to +150°C
Ordering Information
TEMP. RANGE
10kΩ
1kΩ
2
C-Compatible Alert
1kΩ
PIN-PACKAGE
8 SO
8 SO
8 SO
Features
10kΩ
TO INTERRUPT
CONTROLLER
TO SYSTEM
SHUTDOWN
TO SMBus/I
MASTER
2
C
1

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MAX6633 Summary of contents

Page 1

... The devices can be configured to separate addresses, allowing multiple devices to be used on the same bus. The MAX6633 has four address pins, allowing devices to be connected to a single bus. The MAX6634 has three address pins, allowing up to eight devices to be connected to a single bus ...

Page 2

Plus Sign Temperature Sensors with 2 SMBus/I C-Compatible Serial Interface ABSOLUTE MAXIMUM RATINGS V , SDA, SCL ......................................................-0.3V to +6.0V CC All Other Pins ................................................-0. SDA, ALERT, OVERT Current .............................-1mA to +50mA ESD Protection (Human Body Model)................................2000V ...

Page 3

Plus Sign Temperature Sensors with SMBus/I ELECTRICAL CHARACTERISTICS (continued +3.0V to +5.5V -55°C to +125°C, unless otherwise noted. Typical values are wise noted.) PARAMETER SYMBOL SMBus TIMING (Note 3, Figures 1, 2, ...

Page 4

Plus Sign Temperature Sensors with 2 SMBus/I C-Compatible Serial Interface (V = +3.3V +25°C, unless otherwise noted SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE +5. +3.3V CC ...

Page 5

... A1), allowing up to four devices to be connected to a single bus line. The MAX6634 makes three address pins available (A0, A1, A2), allowing up to eight devices to be connected to a single bus line. The MAX6633 makes four address pins available (A0, A1, A2, A3), allowing as many as 16 _______________________________________________________________________________________ 2 ...

Page 6

Plus Sign Temperature Sensors with 2 SMBus/I C-Compatible Serial Interface Write Byte Format S ADDRESS WR 7 bits Slave Address: equivalent to chip-select line wire interface Write Word Format S ADDRESS WR 7 bits Slave Address: ...

Page 7

... F = ACKNOWLEDGE BIT CLOCKED INTO MASTER G = MSB OF DATA CLOCKED INTO MASTER H = LSB OF DATA CLOCKED INTO MASTER CONVERSION PERIOD 0.5s MAX6633/MAX6634/MAX6635 or HIGH ), Maximum LOW ) registers. HYST Figure 5. MAX6633 Functional Diagram SU:STO I = MASTER PULLS DATA LINE LOW L = STOP CONDITION, DATA J = ACKNOWLEDGE CLOCKED INTO SLAVE ...

Page 8

Plus Sign Temperature Sensors with 2 SMBus/I C-Compatible Serial Interface CONFIGURATION Figure 6. MAX6634 Functional Diagram CONFIGURATION Figure 7. MAX6635 Functional Diagram 8 _______________________________________________________________________________________ V CC CMP 12 BIT + SIGN ADC CMP TEMPERATURE T T LOW HIGH SMBus ...

Page 9

... POINTER = 00h T SET POINT HYST (READ/WRITE) POINTER = 02h (MAX6634/MAX6635 ONLY) T SET POINT LOW (READ/WRITE) POINTER = 04h (MAX6634/MAX6635 ONLY) Figure 8. MAX6633/MAX6634/MAX6635 Programmer’s Model _______________________________________________________________________________________ 2 C-Compatible Serial Interface SDA INTERFACE SCL DATA ADDRESS POINTER REGISTER (SELECTS REGISTER FOR COMMUNICATION) (READ/WRITE, SETS OPERATING ...

Page 10

Plus Sign Temperature Sensors with 2 SMBus/I C-Compatible Serial Interface T MAX MAX HYST T HIGH HIGH HYST LOW HYST T LOW ALERT COMPARATOR MODE ALERT INTERRUPT MODE * OVERT ...

Page 11

... OVERT fault without the intervention of a master and thus is ideal to use for driving a cooling fan (Figure 11). Comparator Mode In this application, the polarity of OVERT is active high. LOW The MAX6633/MAX6634/MAX6635 feature a shutdown mode, accessible through the serial interface that saves power by turning off everything except the POR V CC +12V + ...

Page 12

... The key to accurate temperature monitoring is good thermal contact between the MAX6633/MAX6634/ MAX6635 package and the monitored device or circuit. Heat flows in and out of plastic packages primarily through the leads. Short, wide copper traces leading to the temperature monitor ensure that heat transfers quickly and reliably ...

Page 13

Plus Sign Temperature Sensors with SMBus/I Table 2. Pointer Register Bit Assignments ADDRESS DESCRIPTION Temperature register 00h (READ only) Configuration-Byte 01h register 02h T register HYST 03h T register MAX 04h T register LOW 05h T register HIGH Table ...

Page 14

Plus Sign Temperature Sensors with 2 SMBus/I C-Compatible Serial Interface Table 5. Fault Queue Depth D4 NO. OF FAULTS 0 1 Table 6. Output Code vs. Temperature DIGITAL OUTPUT CODE TEMP. (°C) BINARY MSB +150.0000 0100 1011 0000 0XXX ...

Page 15

... Plus Sign Temperature Sensors with 2 SMBus/I C-Compatible Serial Interface TOP VIEW SDA SDA SCL SCL MAX6633 ALERT GND GND SO ______________________________________________________________________________________ SDA SCL 2 MAX6634 OVERT GND 4 SO Pin Configurations ...

Page 16

Plus Sign Temperature Sensors with 2 SMBus/I C-Compatible Serial Interface Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are Maxim cannot assume responsibility for use ...

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