Datasheet

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-compatible,
allowing the MAX6627/MAX6628 to be readily connected
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 version
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 conversion.
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
● Industrial Control Systems
● Notebooks, PCs
Features
● 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
● 12-Bit + Sign, 0.0625°C Resolution
● Low Power Consumption
30μA (typ) (MAX6628)
200μA (typ) (MAX6627)
● Operating Temperature Range (-55°C to +125°C)
● Measurement Temperature Range, Remote Junction
(-55°C to +145°C)
● 0.5s (MAX6627) or 8s (MAX6628) Conversion Rate
● SPI-Compatible Interface
● +3.0V to +5.5V Supply Range
● 8-Pin SOT23 and TDFN Packages
● Lead(Pb)-Free Version Available (TDFN Package)
PART PIN-PACKAGE TOP MARK
MAX6627MKA#TG16 8 SOT23 AEQD
MAX6627MTA+T 8 TDFN-EP* AUT
MAX6628MTA+T 8 TDFN-EP* AUU
SDO
GND
SCK
µC
+ 3V TO + 5.5V
MAX6627
MAX6628
CS
DXP
DXN
2200pF
0.1µF
V
CC
MAX6627/MAX6628 Remote ±1ºC Accurate Digital Temperature
Sensors with SPI-Compatible Serial Interface
19-2032; Rev 6; 4/14
Note: All devices are specified over the -55°C to +125°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.
Typical Operating Circuit
Ordering Information
Pin Configurations appears at end of data sheet.