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PDF MAX7500 Data sheet ( Hoja de datos )
| Número de pieza | MAX7500 | |
| Descripción | Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-3382; Rev 1; 10/04
Digital Temperature Sensors and Thermal
Watchdog with Bus Lockup Protection
General Description
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 I2C-compatible 2-wire serial interface. The
MAX7500/MAX7501/MAX7502 integrate a timeout fea-
ture that offers protection against I2C bus lockups.
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 I2C-
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® and SO packages and operate over the
-55°C to +125°C temperature range.
Applications
PCs
Servers
Office Electronics
Electronic Test Equipment
Industrial Process Control
Features
o Timeout Prevents Bus Lockup
o I2C Bus Interface
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
Accuracy
o µMAX, SO Packages Save Space
o Separate Open-Drain OS Output Operates as
Interrupt or Comparator/Thermostat Input
o Register Readback Capability
o Improved LM75 Second Source
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX7500MSA
-55°C to +125°C 8 SO
MAX7500MUA
-55°C to +125°C 8 µMAX
MAX7501MSA
-55°C to +125°C 8 SO
MAX7501MUA
-55°C to +125°C 8 µMAX
MAX7502MSA
-55°C to +125°C 8 SO
MAX7502MUA
-55°C to +125°C 8 µMAX
I2C is a trademark of Philips Corp.
Purchase of I2C components from Maxim Integrated Products
Inc., or one of its sublicensed Associated Companies, conveys
a license under Philips I2C Patent Rights to use these compo-
nents in an I2C system, provided that the system conforms to
the I2C Standard Specification as defined by Philips.
µMAX is a registered trademark of Maxim Integrated
Products, Inc.
TOP VIEW
SDA 1
SCL 2
OS 3
GND 4
MAX7500
8 +VS
7 A0
6 A1
5 A2
µMAX, SO
Pin Configurations
SDA 1
SCL 2
OS 3
GND 4
MAX7501
MAX7502
8 +VS
7 A0
6 A1
5 RESET
µMAX, SO
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
Digital Temperature Sensors and Thermal
Watchdog with Bus Lockup Protection
Table 1. I2C Slave Addresses
DEVICE
MAX7500
MAX7501
MAX7502
BIT 7
1
1
1
BIT 6
0
0
0
BIT 5
0
0
0
BIT 4
1
1
1
BIT 3
A2
1
0
BIT 2
A1
A1
A1
BIT 1
A0
A0
A0
BIT 0
RD/W
RD/W
RD/W
SDA
tSU:DAT
tLOW
SCL
tHD:DAT
tSU:STA
tHD:STA
tSU:STO
tBUF
tHIGH
tHD:STA
tR tF
START
CONDITION
(S)
PARAMETERS ARE MEASURED FROM 10% TO 90%.
Figure 1. Serial Bus Timing
REPEATED START
CONDITION
(SR)
ACKNOWLEDGE
(A)
STOP
CONDITION
(P)
START
CONDITION
(S)
I2C-Compatible Bus Interface
From a software perspective, the MAX7500/MAX7501/
MAX7502 appear as a set of byte-wide registers that
contain temperature data, alarm threshold values, and
control bits. A standard I2C-compatible 2-wire serial
interface reads temperature data and writes control bits
and alarm threshold data. Each device responds to its
own I2C slave address, which is selected using A0, A1,
and A2. See Table 1.
The MAX7500/MAX7501/MAX7502 employ four stan-
dard I2C protocols: write byte, read byte, send byte,
and receive byte (Figures 1, 2, and 3). The shorter
receive byte protocol allows quicker transfers, provided
that the correct data register was previously selected
by a read-byte instruction. Use caution when using the
shorter protocols in multimaster systems, as a second
master could overwrite the command byte without
informing the first master. 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.
_______________________________________________________________________________________ 5
5 Page 
Digital Temperature Sensors and Thermal
Watchdog with Bus Lockup Protection
Applications Information
Digital Noise
The MAX7500/MAX7501/MAX7502 feature an integrat-
ed lowpass filter on both the SCL and the SDA digital
lines to mitigate the effects of bus noise. Although this
filtering makes communication robust in noisy environ-
ments, good layout practices are always recommend-
ed. Minimize noise coupling by keeping digital traces
away from switching power supplies. Ensure that digital
lines containing high-speed data communications
cross at right angles to the SDA and SCL lines.
Excessive noise coupling into the SDA and SCL lines
on the MAX7500/MAX7501/MAX7502—specifically
noise with amplitude greater than 400mVP-P (the
MAX7500/MAX7501/MAX7502s’ typical hysteresis),
overshoot greater than 300mV above +VS , and under-
shoot more than 300mV below GND—may prevent suc-
cessful serial communication. Serial bus no-acknowl-
edge is the most common symptom, causing unneces-
sary traffic on the bus.
Care must be taken to ensure proper termination within
a system with long PC board traces or multiple parts on
the bus. Resistance can be added in series with the
SDA and SCL lines to further help filter noise and ring-
ing. If it proves to be necessary, a 5kΩ resistor should
be placed in series with the SCL line, placed as close
as possible to SCL. This 5kΩ resistor, with the 5pF to
10pF stray capacitance of the MAX7500/MAX7501/
MAX7502 provide a 6MHz to 12MHz lowpass filter,
which is sufficient filtering in most cases.
Chip Information
TRANSISTOR COUNT: 9611
PROCESS: CMOS
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX7500.PDF ] | |
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