MAX7501 Maxim, MAX7501 Datasheet

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MAX7501

Manufacturer Part Number
MAX7501
Description
Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection
Manufacturer
Maxim
Datasheet

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The MAX7500/MAX7501/MAX7502 temperature sen-
sors accurately measure temperature and provide an
over-temperature alarm/interrupt/shutdown output.
These devices convert the temperature measurements
to digital form using a high-resolution, sigma-delta, ana-
log-to-digital converter (ADC). Communication is
through an I
MAX7500/MAX7501/MAX7502 integrate a timeout fea-
ture that offers protection against I
The 2-wire serial interface accepts standard write byte,
read byte, send byte, and receive byte commands to
read the temperature data and configure the behavior
of the open-drain over-temperature shutdown output.
The MAX7500 features three address select lines, while
the MAX7501 and MAX7502 feature two address select
lines and a RESET input. The MAX7500/MAX7501/
MAX7502s’ 3.0V to 5.5V supply voltage range, low
250µA supply current, and a lockup-protected I
compatible interface make them ideal for a wide range
of applications, including personal computers (PCs),
electronic test equipment, and office electronics.
The MAX7500/MAX7501/MAX7502 are available in 8-
pin µMAX
-55°C to +125°C temperature range.
19-3382; Rev 1; 10/04
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.
PCs
Servers
Office Electronics
Electronic Test Equipment
Industrial Process Control
®
2
and SO packages and operate over the
C -compatible 2-wire serial interface. The
Digital Temperature Sensors and Thermal
TOP VIEW
________________________________________________________________ Maxim Integrated Products
Watchdog with Bus Lockup Protection
General Description
GND
SDA
SCL
OS
1
2
3
4
2
Applications
C bus lockups.
MAX, SO
MAX7500
7
5
8
6
+V
A0
A1
A2
2
S
C-
GND
o Timeout Prevents Bus Lockup
o I
o 3.0V to 5.5V Supply Voltage Range
o 250µA (typ) Operating Supply Current
o 3µA (typ) Shutdown Supply Current
o ±2°C (max) from -25 C to +100 C Temperature
o µMAX, SO Packages Save Space
o Separate Open-Drain OS Output Operates as
o Register Readback Capability
o Improved LM75 Second Source
SDA
SCL
I
Purchase of I
Inc., or one of its sublicensed Associated Companies, conveys
a license under Philips I
nents in an I
the I
µMAX is a registered trademark of Maxim Integrated
Products, Inc.
MAX7500MSA
MAX7500MUA
MAX7501MSA
MAX7501MUA
MAX7502MSA
MAX7502MUA
2
OS
C is a trademark of Philips Corp.
Accuracy
Interrupt or Comparator/Thermostat Input
2
C Bus Interface
2
1
2
3
4
C Standard Specification as defined by Philips.
PART
MAX, SO
MAX7501
MAX7502
2
2
C system, provided that the system conforms to
C components from Maxim Integrated Products
7
5
8
6
2
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
Ordering Information
C Patent Rights to use these compo-
TEMP RANGE
+V
A0
A1
RESET
S
Pin Configurations
PIN-PACKAGE
8 SO
8 µMAX
8 SO
8 µMAX
8 SO
8 µMAX
Features
1

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MAX7501 Summary of contents

Page 1

... The MAX7500 features three address select lines, while the MAX7501 and MAX7502 feature two address select lines and a RESET input. The MAX7500/MAX7501/ MAX7502s’ 3.0V to 5.5V supply voltage range, low 250µ ...

Page 2

... Note 3: Human Body Model, 100pF discharged through a 1.5k resistor. 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 ...

Page 3

... START Condition Setup Time Data Setup Time Data Hold Time Maximum Receive SCL/SDA Rise Time Minimum Receive SCL/SDA Rise Time Maximum Receive SCL/SDA Fall Time Minimum Receive SCL/SDA Fall Time Transmit SDA Fall Time Pulse Width of Suppressed Spike SDA Time Low for Reset of Serial ...

Page 4

... Positive Supply Voltage Input. Bypass to GND with a 0.1µF bypass capacitor. alarm (OS) trip thresholds, and configure other charac- teristics. The MAX7500 features three address select lines (A0, A1, A2) while the MAX7501 and MAX7502 feature two address select lines (A0, A1) and a RESET input. The MAX7500/MAX7501/MAX7502 operate from +3.0V to +5.5V supply voltages of and consume 250µ ...

Page 5

... The MAX7500 has eight dif- ferent slave addresses available; therefore, a maximum of eight MAX7500 devices can share the same bus. The MAX7501/MAX7502 each have four different slave addresses available. BIT 2 BIT 1 ...

Page 6

Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection 2 Figure 2. I C-Compatible Timing Diagram (Write) 6 _______________________________________________________________________________________ ...

Page 7

Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection 2 Figure 3. I C-Compatible Timing Diagram (Read) _______________________________________________________________________________________ 7 ...

Page 8

... Positive X = Don’t care. Register Descriptions The MAX7500/MAX7501/MAX7502 have an internal pn- junction-based temperature sensor whose analog out- put is converted to digital form using a 9-bit sigma-delta ADC. The measured temperature and tem- perature configurations are controlled by the tempera- ture, configuration and T ...

Page 9

... OS deasserted only after performing a read operation. Set bit D0, the shutdown bit, to zero for normal opera- tion. Set bit shut down the MAX7500/ MAX7501/MAX7502 internal blocks, dropping the sup- 2 ply current to 3µA. The I C interface remains active as long as the shutdown bit is set. The T configuration registers can still be written to and read from while in shutdown ...

Page 10

... When the bus timeout is active, the minimum serial clock frequency is limited to 6Hz. The RESET input on the MAX7501/MAX7502 provides a way to reset the I their initial POR values. To reset, apply a low pulse with a duration of at least 1µs to the RESET input. ...

Page 11

... SDA and SCL lines to further help filter noise and ring- ing proves to be necessary placed in series with the SCL line, placed as close as possible to SCL. This 5k 10pF stray capacitance of the MAX7500/MAX7501/ MAX7502 provide a 6MHz to 12MHz lowpass filter, which is sufficient filtering in most cases. (the ...

Page 12

... Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages 0.50–0.1 0.6–0.1 1 0.6–0.1 D TOP VIEW FRONT VIEW ...

Page 13

... A1 FRONT VIEW Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13 © ...

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