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MAX6627MKA#TG16-MAX6627MKA+-MAX6627MTA+T-MAX6628MKA+T
Remote ±1°C Accurate Digital Temperature Sensors with SPI-Compatible Serial Interface
General DescriptionThe MAX6627/MAX6628 precise digital temperature
sensors report the temperature of a remote sensor. The
remote sensor is a diode-connected transistor, typically low-cost, easily mounted 2N3904 NPN type that
replaces conventional thermistors or thermocouples. The
devices can also measure the die temperature 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 temperature of the
devices 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●Industrial Control Systems●Notebooks, PCs
Beneits and Features●Accuracy±1°C (max) from 0°C ≤ TRJ ≤ +125°C, TA = +30°C±2.4°C (max) from -55°C ≤ TRJ ≤ +100°C, 0°C ≤ TA ≤ +70°C●12-Bit + Sign, 0.0625°C Resolution●Low Power Consumption30μA (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)
SDO
GND
SCK
+ 3V TO + 5.5V
MAX6627
MAX6628
CS
DXP
DXN
2200pF
0.1µF
VCC
MAX6627/MAX6628Remote ±1°C Accurate Digital Temperature
Sensors with SPI-Compatible Serial Interface
Typical Operating Circuit
Ordering Information appears at end of data sheet.
(All voltages referenced to GND.)
VCC ..........................................................................-0.3V to +6V
SDO, SCK, DXP, CS ................................-0.3V to (VCC + 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 (TA = +70°C)SOT23 (derate 9.7mW/°C above +70°C) ....................777mWTDFN (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
(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.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
TEMPERATUREAccuracy (Note 1)
0°C ≤ TRJ ≤ +125°C, TA = +30°C,
VCC = +3.3V-1.0±0.5±1
-55°C ≤ TRJ ≤ +100°C, 0°C ≤ TA ≤ +70°C,
VCC = +3.3V-2.4+2.4
-55°C ≤ TRJ ≤ +145°C, 0°C ≤ TA ≤ +70°C,
VCC = +3.3V-4.5+4.5
-55°C ≤ TRJ ≤ +125°C, -55°C ≤ TA ≤
+125°C,VCC = +3.3V-5.5+5.5
Power-Supply Sensitivity0.250.7°C/V
Resolution0.0625°C
Time Between Conversion
StartstSAMPLEMAX66270.5sMAX66288
Conversion TimetCONV180250320ms
POWER SUPPLYSupply Voltage RangeVCC3.05.5V
Supply Current, SCK Idle
ISDOShutdown, VCC = +0.8V5IIDLEADC idle, CS = low20
ICONVADC converting360600
Average Operating Current ICCMAX6627200400µAMAX66283050
Power-On Reset (POR)
ThresholdVCC, falling edge1.6V
Current Sourcing for DiodeHigh level80100120µALow level81012
MAX6627/MAX6628Remote ±1°C Accurate Digital Temperature
Sensors with SPI-Compatible Serial Interface
Electrical CharacteristicsStresses 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.
Absolute Maximum Ratings
Note 1: TRJ is the temperature of the remote junction.
Note 2: Serial timing characteristics guaranteed by design.
(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.)
Electrical Characteristics (continued)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
LOGIC INPUTS (CS, SCK)Logic Input Low VoltageVIL0.3 x
VCCV
Logic Input High VoltageVIH0.7 x
VCCV
Input Leakage CurrentILEAKVCS = VSCK = GND or VCC1µA
LOGIC OUTPUTS (SDO)Output Low VoltageVOLISINK = 1.6mA0.4
Output High VoltageVOHISOURCE = 1.6mAVCC -
0.4V
TIMING CHARACTERISTICS (Note 2, Figure 2)Serial-Clock FrequencyfSCL5MHz
SCK Pulse Width HightCH100ns
SCK Pulse Width LowtCL100ns
CS Fall to SCK RisetCSSCLOAD = 10pF80ns
CS Fall to Output EnabletDVCLOAD = 10pF80ns
CS Rise to Output DisabletTRCLOAD = 10pF50ns
SCK Fall to Output Data ValidtDOCLOAD = 10pF80ns
MAX6627/MAX6628Remote ±1°C Accurate Digital Temperature
Sensors with SPI-Compatible Serial Interface
(VCC = +3.3V, TA = +25°C, unless otherwise noted.)
MAX6627/8 toc06
CAPACITANCE (pF)
TEMPERATURE ERROR (
°C)10,000500015,00020,000
TEMPERATURE ERROR
vs. DXP/DXN CAPACITANCE RESPONSE TO THERMAL SHOCK
MAX6627/8 toc05
TIME (s)
TEMPERATURE (
°C)100k10M1k10010k1M100M
TEMPERATURE ERROR vs.
POWER-SUPPLY NOISE FREQUENCYMAX6627/8 toc04
FREQUENCY (Hz)
TEMPERATURE ERROR (
°C)VIN = SQUARE WAVE
APPLIED TO VCC WITH NO
0.1µF CAPACITOR
VIN = 250mVp-p
POWER-ON-RESET THRESHOLD
vs. TEMPERATURE
MAX6627/8 toc03
TEMPERATURE (°C)
POWER-ON-RESET THRESHOLD (V)
TEMPERATURE ERROR vs. TEMPERATURE
MAX6627/8 toc02
TEMPERATURE (°C)
TEMPERATURE ERROR (
°C)TA = +25°C
TA = 0°C
MAX6627
TA = +70°C
AVERAGE OPERATING CURRENT
vs. SUPPLY VOLTAGE
MAX6627/8 toc01
SUPPLY VOLTAGE (V)
AVERAGE OPERATING CURRENT (
MAX6627
MAX6628
MAX6627/MAX6628Remote ±1°C Accurate Digital Temperature
Sensors with SPI-Compatible Serial Interface
Typical Operating Characteristics
PINNAMEFUNCTIONGNDGroundDXNCombined Current Sink and ADC Negative Input for Remote Diode. DXN is normally biased to a diode
voltage above ground.DXPCombined Current Source and ADC Positive Input for Remote Diode. Place a 2200pF capacitor between
DXP and DXN for noise filtering.VCCSupply Voltage Input. Bypass with a 0.1µF to GND.SCKSPI Clock InputCSChip-Select Input. Pulling CS low initiates an idle state, but the SPI interface is still enabled. A rising-edge
of CS initiates the next conversion.SDOSPI Data OutputN.C.No Connect. Internally not connected. Can be connected to GND for improved thermal conductivity.EPExposed Pad. Internally connected to GND. Connect to a large ground plane to maximize thermal
performance. Not intended as an electrical connection point.
MAX6627/MAX6628Remote ±1°C Accurate Digital Temperature
Sensors with SPI-Compatible Serial Interface
Pin DescriptionSCKVCC
N.C.
SDODXN
DXP
GND
SOT23TOP VIEW
MAX6627
465
N.C.CSSCK
MAX6627
MAX6628
SDO
GNDDXP
VCCDXN
TDFN
Pin Conigurations
Detailed DescriptionThe MAX6627/MAX6628 remote digital thermometers
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.
These devices can also measure the die temperature of
other ICs, such as µPs or 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
temperature of the MAX6627/MAX6628 is +30°C. Data
is available as a 12-bit + sign word with 0.0625°C
resolution. The operating range of the device extends
from -55°C to +125°C, although the architecture of the
device is capable of interpreting data up to +145°C. The
device itself should never exceed +125°C.
The devices are designed to work in conjunction with
an external µC or other intelligent device serving as
the master in thermostatic, process-control, or
monitoring applications. The µC is typically a power
management or keyboard controller, generating SPI serial
commands by “bit-banging” GPIO pins.
Two conversion rates are available; the MAX6627
continuously converts data every 0.5s, and the MAX6628
continuously converts data every 8s. Either device can
be read at any time and provide the data from the last
conversion. The slower version provides minimal power
consumption under all operating conditions. Or, by
taking CS low, any conversion in progress is stopped,
and the rising-edge of CS always starts a fresh
conversion and resets the interface. This permits
triggering a con-version at any time so that the power
consumption of the MAX6627 can be overcome, if
needed. Both devices operate with input voltages between
+3.0V and +5.5V and are specified between -55°C and
+125°C. The MAX6627/MAX6628 come in space-saving
8-pin SOT23 and TDFN packages.
ADC Conversion SequenceThe device powers up as a free-running data converter
(Figure 1). The CS pin can be used for conversion
control. The rising-edge of CS resets the interface and
starts a conversion. The falling-edge of CS stops any
conversion in progress, overriding the latency of the part.
Temperature data from the previous completed conversion
is available for read (Table 1 and Table 2). It is required
to maintain CS high for a minimum of 320ms to complete
a conversion.
Idle ModePull CS low to enter idle mode. In idle mode, the ADC
is not converting. The serial interface is still active and
temperature data from the last completed conversion can
still be read.
Power-On ResetThe POR supply voltage of the MAX6627/MAX6628 is
typically 1.6V. Below this supply voltage, the interface
is inactive and the data register is set to the POR state,
Table 1. Data Output Format Figure 1. Free-Running Conversion Time and Rate Relationships
D15D14D13D12D11D10D9D8D7D6D5D4D3D2D1D0SignMSB
LSBLowHigh-ZHigh-Z
MAX6627
MAX6628
0.5s
SAMPLE
RATE
SAMPLE
RATE0.25s
CONVERSION
TIME
ADC CONVERTING
ADC IDLE
MAX6627/MAX6628Remote ±1°C Accurate Digital Temperature
Sensors with SPI-Compatible Serial Interface
