MAXIM MAX6627, MAX6628 Technical data

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 tem­perature of other ICs, such as microprocessors (µPs) or
microcontrollers (µCs) that contain an on-chip, diode­connected transistor.

Remote accuracy is ±1°C when the temperature of the
remote diode is between 0°C and +125°C and the tem­perature of the MAX6627/MAX6628 is +30°C. The tem­perature 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 tempera­ture 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 continu­ously 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

Automotive

Industrial Control Systems

Notebooks, PCs

Features

♦ Accuracy

±1°C (max) from 0°C ≤ T

RJ

≤ +125°C, TA= +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)

MAX6627/MAX6628

Remote ±1°C Accurate Digital Temperature

Sensors with SPI-Compatible Serial Interface

________________________________________________________________

Maxim Integrated Products

1

19-2032; Rev 5; 6/11

Ordering Information

SPI is a trademark of Motorola, Inc.

Pin Configurations appears at end of data sheet.

SDO

GND

SCK

μC

+ 3V TO + 5.5V

MAX6627
MAX6628

CS

DXP

DXN

2200pF

0.1μF

VCC

Typical Operating Circuit

Note: All devices are specified over the -55°C to +125°C oper­ating 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.

PART PIN-PACKAGE TOP MARK

MAX6627MKA#TG16 8 SOT23 AEQD

MAX6627MTA+T 8 TDFN-EP* AUT

MAX6628MTA+T 8 TDFN-EP* AUU

MAX6627/MAX6628

Remote ±1°C Accurate Digital Temperature
Sensors with SPI-Compatible Serial Interface

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

(All voltages referenced to GND.)
V

CC

...........................................................................-0.3V to +6V

SDO, SCK, DXP, CS ...................................-0.3V to (V

CC

+ 0.3V)

DXN .......................................................................-0.3V to +0.8V

SDO Pin Current Range ......................................-1mA to +50mA

Current Into All Other Pins ..................................................10mA

ESD Protection (Human Body Model) .............................±2000V

Continuous Power Dissipation (T

A

= +70°C)

SOT23 (derate 9.7mW/°C above +70°C).....................777mW

TDFN (derate 18.5mW/°C above +70°C)................1481.5mW

Operating Temperature Range .........................-55°C to +125°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Soldering Temperature (reflow) .......................................+260°C

ELECTRICAL CHARACTERISTICS

(3.0V ≤ VCC≤ 5.5V, -55°C ≤ TA≤ +125°C, unless otherwise noted. Typical values are at TA= +25°C, VCC= +3.3V, unless otherwise
noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

TEMPERATURE

0°C ≤ TRJ ≤ +125°C, TA = +30°C,
V

= +3.3V

CC

-55°C ≤ TRJ ≤ +100°C, 0°C ≤ TA ≤ +70°C,
V

= +3.3V

Accuracy (Note 1)

Power-Supply Sensitivity 0.25 0.7 °C/V

Resolution 0.0625 °C

Ti m e Betw een C onver si on S tar ts t

Conversion Time t

POWER SUPPLY

Supply Voltage Range V

Supply Current, SCK Idle

Average Operating Current I

Power-On Reset (POR)
Threshold

Current Sourcing for Diode

SAMPLE

CONV

CC

I

SDO

I

IDLE

I

CONV

CC

CC

-55°C ≤ TRJ ≤ +145°C, 0°C ≤ TA ≤ +70°C,
V

= +3.3V

CC

-55°C ≤ T
V

CC

MAX6627 0.5

MAX6628 8

Shutdown, VCC = +0.8V 5
ADC idle, CS = low 20

ADC converting 360 600

MAX6627 200 400

MAX6628 30 50

V

CC

High level 80 100 120

Low level 8 10 12

≤ +125°C, -55°C ≤ TA ≤ +125°C,

RJ

= +3.3V

, falling edge 1.6 V

-1.0 ±0.5 ±1

-2.4 +2.4

-4.5 +4.5

-5.5 +5.5

180 250 320 ms

3.0 5.5 V

°C

s

µA

µA

µA

MAX6627/MAX6628

Remote ±1°C Accurate Digital Temperature

Sensors with SPI-Compatible Serial Interface

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(3.0V ≤ VCC≤ 5.5V, -55°C ≤ TA≤ +125°C, unless otherwise noted. Typical values are at TA= +25°C, VCC= +3.3V, unless otherwise
noted.)

Note 1: TRJis the temperature of the remote junction.
Note 2: Serial timing characteristics guaranteed by design.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

LOGIC INPUTS (CS, SCK)

Logic Input Low Voltage V

Logic Input High Voltage V

Input Leakage Current I

LOGIC OUTPUTS (SDO)

Output Low Voltage V

Output High Voltage V

TIMING CHARACTERISTICS (Note 2, Figure 2)

Serial-Clock Frequency f

SCK Pulse Width High t

SCK Pulse Width Low t

CS Fall to SCK Rise t
CS Fall to Output Enable t
CS Rise to Output Disable t

SCK Fall to Output Data Valid t

IL

IH

LEAK

OL

OH

SCL

CH

CL

CSS

DV

TR

DO

0.7 x
V

CC

VCS = V

I

SINK

I

SOURCE

C

LOAD

C

LOAD

C

LOAD

C

LOAD

= GND or V

SCK

= 1.6mA 0.4

= 1.6mA

= 10pF 80 ns

= 10pF 80 ns

= 10pF 50 ns

= 10pF 80 ns

CC

V

-

CC

0.4

100 ns

100 ns

0.3 x
V

CC

1µA

5 MHz

V

V

V