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MAX6635MSA+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
General Description
The MAX6633/MAX6634/MAX6635 combine a tempera-
ture sensor, a programmable overtemperature alarm,
and an SMBus™/I
2
C™-compatible serial interface into
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.
Applications
Battery Temperature Alarms
PC Temperature Control
Automotive Equipment
Features
♦ +3V to +5.5V Supply Range
♦ Accuracy
±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)
♦ User-Programmable Temperature Thresholds
(MAX6634/MAX6635)
♦ User-Configurable Alarm Output(s)
(MAX6634/MAX6635)
♦ Ability to Respond to SMBus/I
2
C-Compatible Alert
Response Address (MAX6634/MAX6635)
♦ OVERT Output for System Shutdown (MAX6635)
♦ Multiple Devices per Bus
16 devices (MAX6633)
8 devices (MAX6634)
4 devices (MAX6635)
MAX6633/MAX6634/MAX6635
12-Bit Plus Sign Temperature Sensors with
SMBus/I
2
C-Compatible Serial Interface
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-2120; Rev 0; 8/01
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.
EVALUATION KIT
AVAILABLE
PART TEMP. RANGE PIN-PACKAGE
MAX6633MSA -55°C to +150°C 8 SO
MAX6634MSA -55°C to +150°C 8 SO
MAX6635MSA -55°C to +150°C 8 SO
SMBus is a trademark of Intel Corp.
I
2
C is a trademark of Philips Corp.
V
CC
V
CC
SCL
SDA
1
5
8
2
3
TO SYSTEM
SHUTDOWN
A0 A1 GND
+3.0V TO +5.5V
0.1μF
ALERT
OVERT
MAX6635
467
10kΩ 1kΩ 1kΩ 10kΩ
TO INTERRUPT
CONTROLLER
TO SMBus/I
2
C
MASTER
Typical Operating Circuit
Pin Configurations appear at end of data sheet.
MAX6633/MAX6634/MAX6635
12-Bit Plus Sign Temperature Sensors with
SMBus/I
2
C-Compatible Serial Interface
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +5.5V, T
A
= -55°C to +125°C, unless otherwise noted. Typical values are V
CC
= +3.3V, T
A
= +25°C, unless other-
wise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V
CC
, SDA, SCL......................................................-0.3V to +6.0V
All Other Pins ................................................-0.3V to V
CC
+0.3V
SDA, ALERT, OVERT Current .............................-1mA to +50mA
ESD Protection (Human Body Model)................................2000V
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 5.88mW/°C above +70°C)................471mW
Junction Temperature......................................................+150°C
Operating Temperature Range .........................-55°C to +150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
TEMPERATURE-TO-DIGITAL CONVERTER CHARACTERISTICS
Supply Range V
CC
3.0 5.5 V
0°C ≤ T
A
= ≤ +50°C, V
CC
= +3.3V -1.0 ±0.4 +1.0
-20°C ≤ T
A
= ≤ +85°C, V
CC
= +3.3V -1.5 ±0.6 +1.5
-40°C ≤ T
A
= ≤ 125°C, V
CC
= +3.3V -2.5 ±1.0 +2.5
T
A
= -55°C, V
CC
= +3.3V ±1.5 +2.8
Accuracy (Note 1)
T
A
= +150°C, V
CC
= +3.3V ±2.5
°C
Power-Supply Rejection Ratio PSRR 0.2 0.5 °C/V
POR Threshold Hysteresis 90 mV
V
CC
= +3.0V, SMBus inactive 12 20
Supply Current in Shutdown
V
CC
= +5.5V, SMBus inactive 20 30
µA
V
CC
= +3.0V, SMBus inactive 150
Average Operating Current
V
CC
= +5.5V, SMBus inactive 200
µA
V
CC
= +3.0V, SMBus inactive 270 350
Peak Operating Current (Note 2)
V
CC
= +5.5V, SMBus inactive 350 700
µA
Conversion Rate 1.4 2 2.4 Hz
DIGITAL INTERFACE
Logic Input Low Voltage V
IL
V
CC
= +3.0V to +5.5V 0.65 V
V
CC
= +3V 2.2 V
Logic Input High
Voltage
V
IH
V
CC
= +5.5V 2.4
Input Leakage Current I
I_LEAK
V
IN
= GND or V
CC
±1µA
Output Low Sink Current I
OL
V
OL
= 0.6V (SMBDATA,
ALERT, OVERT)
6mA
Output Leakage Current I
O_LEAK
ALERT, OVERT at V
CC
±1µA
Input Capacitance C
IN
5pF
MAX6633/MAX6634/MAX6635
12-Bit Plus Sign Temperature Sensors with
SMBus/I
2
C-Compatible Serial Interface
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +5.5V, T
A
= -55°C to +125°C, unless otherwise noted. Typical values are V
CC
= +3.3V, T
A
= +25°C, unless other-
wise noted.)
Note 1: Guaranteed by design and characterization.
Note 2: Peak operating current measured during conversion. See Figure 4.
Note 3: Guaranteed by design, not production tested.
Note 4: A master device must provide a hold time of at least 300ns for the SDA signal in order to bridge the undefined region of
SCL’s falling edge.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SMBus TIMING (Note 3, Figures 1, 2, and 3)
Serial Clock Frequency f
SCL
10 100 kHz
Bus Free Time Between STOP
and START Condition
t
BUF
4.7 µs
START Condition Setup Time 4.7 µs
Repeat START Condition Setup
Time
t
SU:STA
90% to 90% 4.7 µs
START Condition Hold Time t
HD:STA
10% of SMBDATA to 90% of SMBCLK 4 µs
STOP Condition Setup Time t
SU:STO
90% of SMBCLK to 10% of SMBDATA 4 µs
Data Setup Time t
SU: DAT
90% of SMBDATA to 10% of SMBCLK 250 ns
Data Hold Time (Note 4) t
HD: DAT
300 ns
Receive SCL/SDA Rise Time t
R
1µs
SCL/SDA Fall Time (Note 4) t
F
300 ns
Clock Low Period t
LOW
10% to 10% 4.7 µs
Clock High Period t
HIGH
90% to 90% 4 µs
SMBus Timeout 25 48 ms
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX6635MSA+

Mfr. #:
Buy MAX6635MSA+
Manufacturer:
Maxim Integrated
Description:
Board Mount Temperature Sensors 12-Bit + Sign Temperature Sensor
Lifecycle:
New from this manufacturer.
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