MAX6627_08 Datasheet, PDF (1/9 Pages) Maxim Integrated Products – Remote 1°C Accurate Digital Temperature Sensors with SPI-Compatible Serial Interface

19-2032; Rev 4; 8/08
Remote ±1°C Accurate Digital Temperature
Sensors with SPI-Compatible Serial Interface
General Description
The MAX6627/MAX6628 precise digital temperature
sensors report the temperature of a remote sensor. The
remote sensor is a diode-connected transistor, typically
a low-cost, easily mounted 2N3904 NPN type that
replaces conventional thermistors or thermocouples.
The MAX6627/MAX6628 can also measure the die tem-
perature of other ICs, such as microprocessors (µPs) or
microcontrollers (µCs) that contain an on-chip, diode-
connected transistor.
Remote accuracy is ±1°C when the temperature of the
remote diode is between 0°C and +125°C and the tem-
perature of the MAX6627/MAX6628 is +30°C. The tem-
perature is converted to a 12-bit + sign word with
0.0625°C resolution. The architecture of the device is
capable of interpreting data as high as +145°C from
the remote sensor. The MAX6627/MAX6628 tempera-
ture should never exceed +125°C.
These sensors are 3-wire serial interface SPI™ compat-
ible, allowing the MAX6627/MAX6628 to be readily con-
nected to a variety of µCs. The MAX6627/MAX6628 are
read-only devices, simplifying their use in systems
where only temperature data is required.
Two conversion rates are available, one that continu-
ously converts data every 0.5s (MAX6627), and one
that converts data every 8s (MAX6628). The slower ver-
sion provides minimal power consumption under all
operating conditions (30µA, typ). Either device can be
read at any time and provide the data from the last con-
version.
Both devices operate with supply voltages between
+3.0V and +5.5V, are specified between -55°C and
+125°C, and come in space-saving 8-pin SOT23 and
lead-free TDFN packages.
Applications
Hard Disk Drive
Smart Battery Packs
Automotive
Industrial Control Systems
Notebooks, PCs
SPI is a trademark of Motorola, Inc.
Pin Configurations appears at end of data sheet.
Features
o Accuracy
±1°C (max) from 0°C ≤ T_RJ ≤ +125°C, T_A = +30°C
±2.4°C (max) from -55°C ≤ T_RJ ≤ +100°C,
0°C ≤ T_A ≤ +70°C
o 12-Bit + Sign, 0.0625°C Resolution
o Low Power Consumption
30µA (typ) (MAX6628)
200µA (typ) (MAX6627)
o Operating Temperature Range (-55°C to +125°C)
o Measurement Temperature Range, Remote
Junction (-55°C to +145°C)
o 0.5s (MAX6627) or 8s (MAX6628) Conversion Rate
o SPI-Compatible Interface
o +3.0V to +5.5V Supply Range
o 8-Pin SOT23 and TDFN Packages
o Lead-Free Version Available (TDFN Package)
Ordering Information
PART
PIN-PACKAGE
TOP MARK
MAX6627MKA#T
8 SOT23
AAEQ
MAX6627MTA+T
8 TDFN-EP*
+AUT
MAX6628MKA#T
8 SOT23
AAER
MAX6628MTA+T
8 TDFN-EP*
+AUU
Note: All devices are specified over the -55°C to +125°C oper-
ating temperature range.
#Denotes an RoHS-compliant package.
T = Tape and reel.
+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Operating Circuit
+ 3V TO + 5.5V
0.1μF
V_CC
GND
MAX6627
MAX6628
SDO
DXP
2200pF
CS
μC
DXN
SCK
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