19-2032; Rev 3; 4/06
Remote ±±1° Accurate Diꢀital ꢁemperature
Sensors with SPI-°ompatible Serial Interface
General Description
Features
♦ Accuracy
±±1° ꢀ(aꢁx ꢂrꢃ( ꢄ1° ≤ T ≤ +±251°, T = +3ꢄ1°
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.
RJ
A
±2ꢅ.1° ꢀ(aꢁx ꢂrꢃ( ꢆ551° ≤ T ≤ +±ꢄꢄ1°,
RJ
ꢄ1° ≤ T ≤ +7ꢄ1°
A
♦ ±2ꢆBit + Sign, ꢄꢅꢄ6251° Resꢃlutiꢃn
♦ Lꢃw Pꢃwer °ꢃnsu(ptiꢃn
3ꢄµA ꢀtypx ꢀMAX6628x
2ꢄꢄµA ꢀtypx ꢀMAX6627x
♦ Operating Te(perature Range ꢀꢆ551° tꢃ +±251°x
♦ Measure(ent Te(perature Range, Re(ꢃte
Remote accuracy is ±±1C when the temperature of the
remote diode is between 01C and +±251C and the tem-
perature of the MAX6627/MAX6628 is +301C. The tem-
perature is converted to a ±2-bit + sign word with
0.06251C resolution. The architecture of the device is
capable of interpreting data as high as +±451C from
the remote sensor. The MAX6627/MAX6628 tempera-
ture should never exceed +±251C.
Junctiꢃn ꢀꢆ551° tꢃ +±.51°x
♦ ꢄꢅ5s ꢀMAX6627x ꢃr 8s ꢀMAX6628x °ꢃnversiꢃn Rate
♦ SPIꢆ°ꢃ(patible Interꢂace
♦ +3ꢅꢄV tꢃ +5ꢅ5V Supply Range
♦ 8ꢆPin SOT23 and TDFN Packages
♦ LeadꢆFree Versiꢃn Available ꢀTDFN Packagex
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.
Orderinꢀ Information
PINꢆ
TOP
PKG
PART
PA°KAGE
MARK
°ODE
MAX6627MKA-T
MAX6627MTA+T
MAX6628MKA-T
MAX6628MTA+T
8 SOT23-8
8 TDFN
AAEQ
+AUT
AAER
+AUU
K8F-4
T833-2
K8F-4
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.
8 SOT23-8
8 TDFN
T833-2
Note: All devices are specified over the -55°C to +125°C oper-
ating temperature range.
+Denotes lead-free package.
Both devices operate with supply voltages between
+3.0V and +5.5V, are specified between -551C and
+±251C, and come in space-saving 8-pin SOT23 and
lead-free TDFN packages.
ꢁypical Operatinꢀ °ircuit
+ 3V TO + 5.5V
0.1µF
Applications
Hard Disk Drive
V
GND
CC
Smart Battery Packs
Automotive
MAX6627
MAX6628
Industrial Control Systems
Notebooks, PCs
SDO
2200pF
2200pF
DXP
DXN
µC
CS
SCK
SPI is a trademark of Motorola, Inc.
Pin Configurations appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
±
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.