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PDF MAX6662 Data sheet ( Hoja de datos )
| Número de pieza | MAX6662 | |
| Descripción | 12-Bit + Sign Temperature Sensor | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-2121; Rev 0; 7/01
12-Bit + Sign Temperature Sensor with
SPI-Compatible Serial Interface
General Description
The MAX6662 is a 12-bit + sign temperature sensor
combined with a programmable overtemperature alarm
and a 3-wire (SPI™-compatible) serial interface in a sin-
gle package. It converts its die temperature into digital
values using an internal analog-to-digital converter
(ADC). The temperature data is stored in a temperature
register as a 13-bit word, which allows 0.0625°C resolu-
tion. The temperature data is readable at any time
through the serial interface. The operating temperature
range is -55°C to +150°C.
The MAX6662 provides two programmable watchdog
interrupt outputs. ALERT is used for lower temperature
warning functions, while OT is used for higher tempera-
ture-critical functions, such as power-supply shutdown.
The MAX6662 features a shutdown mode that saves
power by disabling everything except the serial inter-
face. The temperature sensor is available in an 8-pin SO
package.
Features
♦ 12-Bit + Sign, 0.0625°C Resolution
♦ Accuracy
±1°C max (+30°C to +50°C)
±1.6°C max (0°C to +70°C)
±2.5°C max (-20°C to +85°C)
±2.5 typ (+150°C)
♦ Extended Temperature Measurement Range
-55°C to +150°C
♦ Low Average Supply Current, 125µA (typ)
♦ Shutdown Mode to Minimize Power Consumption
in Portable Applications
♦ Two Programmable Temperature Fault Outputs
♦ Switchable Fault Queue to Eliminate False
Tripping in Noisy Environments
HVAC
Refrigeration
Automotive
Test Equipment
Applications
www.DataSheet4U.com
Typical Operating Circuit
VCC = +3V TO +5.5V
HEAT
SOURCES
0.1µF
VCC
MAX6662
10kΩ
OT
ALERT
SIO
SCLK
CS
10kΩ
PART
MAX6662MSA
Ordering Information
TEMP. RANGE
-55°C to +150°C
PIN-PACKAGE
8 SO
TOP VIEW
Pin Configuration
SCLK 1
CS 2
SIO 3
GND 4
MAX6662
8 VCC
7 NC
6 ALERT
5 OT
SO
SPI is a trademark of Motorola, Inc.
________________________________________________________________ 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  
12-Bit + Sign Temperature Sensor with
SPI-Compatible Serial Interface
VCC
OT
12 -BIT
+ SIGN
ADC
ALERT
TEMPERATURE TLOW THIGH TMAX THYST CONFIGURATION
SIO
SCLK
CS
SERIAL INTERFACE
Figure 1. MAX6662 Simplified Functional Diagram
www.DFaotarSehxeaetm4Up.lceo:mIf THIGH is set to 100°C and THYST is set
to 20°C, ALERT does not assert until temperature
exceeds 100°C. If the temperature is then read through
the serial interface, ALERT deasserts. ALERT asserts
again when temperature is less than 80°C (Figure 2).
Comparator Mode
In the comparator mode, ALERT is asserted when tem-
perature exceeds the value in the THIGH register, or is
lower than the value in the TLOW register. ALERT
deasserts when temperature is less than THIGH - THYST
or greater than TLOW + THYST. Reading the registers
does not deassert ALERT.
For example: If THIGH is set to 100°C and TLOW is set
to 80°C, ALERT does not assert until temperature
exceeds 100°C, or is below 80°C. Then, ALERT only
deasserts if temperature is less than THIGH - THYST or
greater than TLOW + THYST.
Overtemperature Alert
OT operates only in comparator mode. The OT pin is
asserted when the temperature exceeds TMAX, and
deasserted when the temperature drops below
TMAX - THYST. A read operation does not reset OT.
OT is an open-drain active-low (default) output, but can
be programmed to active-high.
THIGH
THIGH - THYST
TEMPERATURE
TLOW + THYST
TLOW
ALERT
* TEMPERATURE READ
**
*
LAST INTERRUPT MISSED, BUT
THRESHOLD STILL CHANGES TO THIGH.
Figure 2. Example of ALERT Operation in Interrupt Mode
_______________________________________________________________________________________ 5
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| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MAX6662.PDF ] | |
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