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 (礟s) or
microcontrollers (礐s) that contain an on-chip, diode-
connected transistor.
Remote accuracy is ?癈 when the temperature of the
remote diode is between 0癈 and +125癈 and the tem-
perature of the MAX6627/MAX6628 is +30癈. The tem-
perature is converted to a 12-bit + sign word with
0.0625癈 resolution. The architecture of the device is
capable of interpreting data as high as +145癈 from
the remote sensor. The MAX6627/MAX6628 tempera-
ture should never exceed +125癈.
These sensors are 3-wire serial interface SPI" compat-
ible, allowing the MAX6627/MAX6628 to be readily con-
nected to a variety of 礐s. 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 (30礎(chǔ), 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癈 and
+125癈, 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
Features
f Accuracy
?癈 (max) from 0癈 d T
RJ
d +125癈, T
A
= +30癈
?.4癈 (max) from -55癈 d T
RJ
d +100癈,
0癈 d T
A
d +70癈
f 12-Bit + Sign, 0.0625?/SPAN>C Resolution
f Low Power Consumption
30礎(chǔ) (typ) (MAX6628)
200礎(chǔ) (typ) (MAX6627)
f Operating Temperature Range (-55?/SPAN>C to +125?/SPAN>C)
f Measurement Temperature Range, Remote
Junction (-55癈 to +145癈)
f 0.5s (MAX6627) or 8s (MAX6628) Conversion Rate
f SPI-Compatible Interface
f +3.0V to +5.5V Supply Range
f 8-Pin SOT23 and TDFN Packages
f Lead(Pb)-Free Version Available (TDFN Package)
Remote ?癈 Accurate Digital Temperature
Sensors with SPI-Compatible Serial Interface
________________________________________________________________ Maxim Integrated Products   1
19-2032; Rev 5; 6/11
Ordering Information
PART
PIN-PACKAGE
TOP MARK
MAX6627MKA#TG16     8 SOT23
AEQD
MAX6627MTA+T
8 TDFN-EP*
AUT
MAX6628MTA+T
8 TDFN-EP*
AUU
SPI is a trademark of Motorola, Inc.
Pin Configurations appears at end of data sheet.
SDO
GND
SCK
糃
+ 3V TO + 5.5V
MAX6627
MAX6628
CS
DXP
DXN
2200pF
0.1糉
CC
Typical Operating Circuit
Note: All devices are specified over the -55?/SPAN>C to +125?/SPAN>C oper-
ating temperature range.
#Denotes a RoHS-compliant device that may include lead(Pb)
that is exempt under the RoHS requirements.
+Denotes a lead-free/RoHS-compliant package.
T = Tape and reel.
*EP = Exposed pad.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.