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MAX6662MSA+-MAX6662MSA+T
12-Bit + Sign Temperature Sensor with SPI-Compatible Serial Interface
General DescriptionThe MAX6662 is a 12-bit + sign temperature sensor
combined with a programmable overtemperature alarm
and a 3-wire (SPI-compatible) serial interface in a single
package. It converts its die temperature into digital values
using an internal analog-to-digital converter (ADC). The
temperature data is stored in a temperature register as a
13-bit word, which allows 0.0625°C resolution. The tem-
perature data is readable at any time through the serial
interface. The operating temperature range is -55°C to
+150°C.
The MAX6662 provides two programmable watchdog
interrupt outputs. ALERT is used for lower temperature
warning functions, while OT is used for higher tempera-
ture-critical functions, such as power-supply shutdown.
The MAX6662 features a shutdown mode that saves
power by disabling everything except the serial interface.
The temperature sensor is available in an 8-pin SO pack-
age.
Applications●HVAC●Refrigeration●Test Equipment
Features●12-Bit + Sign, 0.0625°C Resolution●Accuracy ±1°C max (+30°C to +50°C) ±1.6°C max (0°C to +70°C) ±2.5°C max (-20°C to +85°C) ±2.5 typ (+150°C)●Extended Temperature Measurement Range -55°C to +150°C●Low Average Supply Current, 125µA (typ)●Shutdown Mode to Minimize Power Consumption in
Portable Applications●Two Programmable Temperature Fault Outputs●Switchable Fault Queue to Eliminate False Tripping
in Noisy Environments
PARTTEMP. RANGEPIN-PACKAGEMAX6662MSA-55°C to +150°C8 SO
ALERTGND
VCCCS
SIO
SCLK
TOP VIEW
MAX6662
10kΩ10kΩ
0.1µF
VCC
ALERT
SIO
SCLK
SYSTEM
CONTROLLER
VCC = +3V TO +5.5V
HEAT
SOURCESMAX6662
MAX666212-Bit + Sign Temperature Sensor with
SPI-Compatible Serial Interface
Pin ConigurationTypical Operating Circuit
Ordering Information
EVALUATION KIT AVAILABLE
(All voltages are referenced to GND.)
VCC ..........................................................................-0.3V to +6V
ALERT, OT. .............................................................-0.3V to +6V
SIO, SCLK, CS .........................................-0.3V to (VCC + 0.3V)
SIO Current ......................................................-10mA to +50mA
Continuous Current into Any Pin (except NC)....................10mA
Continuous Power Dissipation (TA = +70°C)8-Pin SO (derate 5.9mW/°C above +70°C) .................471mW
Operating Temperature Range (Note 1) .........-55°C to +150°C
Junction Temperature ......................................................+150°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
(VCC = +3V to +5.5V, TA = -55°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C and VCC = +3.3V.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
TEMPERATURE TO DIGITAL-CONVERTER CHARACTERISTICSAccuracy
+30°C ≤ TA ≤ +50°C, VCC = +3.3V-1.0±0.4+1.0
0°C ≤ TA ≤ +70°C, VCC = +3.3V-1.6±0.7+1.6
-20°C ≤ TA ≤ +85°C, VCC = +3.3V-2.5±1.0+2.5
-40°C ≤ TA ≤ +100°C, VCC = +3.3V-3.0±1.2+3.0
-55°C ≤ TA ≤ +125°C, VCC = +3.3V-4.0±1.5+4.0
TA ≤ +150°C, VCC = +3.3V±2.5
Power-Supply Rejection RatioPSRR0.20.5°C/V
Resolution0.0625°C
Supply Voltage RangeVCC3.05.5V
Average Operating CurrentVCC = +5.5V150µAVCC = +3.0V125
Peak Operating Current (Note 2)
VCC = +5.5V300600VCC = +3.0V300500
Shutdown Supply CurrentVCC = +5.5V822µA
VCC = +3.0V415
Power-On-Reset ThresholdVPOR2.02.5V
Power-On-Reset Threshold Hysteresis90mV
Conversion TimetCONV0.25s
Temperature Update Frequency2Hz
SERIAL INTERFACE (SIO, SCLK, CS, ALERT, OT)Input Low VoltageVIL0.8 V
Input High VoltageVIH0.7 VCCV
Input/Output Leakage CurrentILEAKVIN = GND or VCC-5+5µA
Input CapacitanceCin5pF
Output Low Sink CurrentIOLALERT, OT, VOL = 0.6V3mA
Output High VoltageVOHISIO = 1.6mA sourceVCC - 0.4V
MAX666212-Bit + Sign Temperature Sensor 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.
Note 1: The MAX6662 is not recommended to operate above +125°C for an extended period of time.
Absolute Maximum Ratings
Note 2: Peak operating current measured during conversion.
(VCC = +3V, TA = +25°C, unless otherwise noted.)
(VCC = +3V to +5.5V, TA = -55°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C and VCC = +3.3V.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
SERIAL INTERFACE TIMINGSerial Clock FrequencyfSCLK2.5MHz
SCLK High Pulse WidthtCH200ns
SCLK Low Pulse WidthtCL200ns
CS High Pulse WidthtCSW200ns
SCLK Fall to Output Data ValidtDOCLOAD = 100pF100ns
CS Fall to SCLK RisetCSS100ns
CS Rise to Output DisabletTRCLOAD = 100pF100ns
CS to SCLK Hold TimetCSH0ns
SIO to SCLK Setup TimetDS100ns
SIO to SCLK Hold TimetDH0ns
Output Fall TimetF10ns
SUPPLY CURRENT
VS. TEMPERATURE
MAX6662 toc03
TEMPERATURE (°C)
SUPPLY CURRENT (
VCC = +5.0V
AVERAGE OVER 2
VCC = +3.3V
VCC = +3.0V
TEMPERATURE
ERROR DISTRIBTUTION
MAX6662 toc02
TEMPERATURE ERROR (°C)
PERCENTAGE OF SAMPLES (%)
NOTE: DEVICESTRIMMED AT
TA = +30°C
200 SAMPLES
TA = +30°C
TEMPERATURE ERROR
VS. TEMPERATURE
MAX6662 toc01
TEMPERATURE (°C)
TEMPERATURE ERROR (
VCC = +5.0V
VCC = +3.3V
VCC = +3.0V
MAX666212-Bit + Sign Temperature Sensor with
SPI-Compatible Serial Interface
Typical Operating Characteristics
Electrical Characteristics continued)
(VCC = +3V, TA = +25°C, unless otherwise noted.)
Detailed DescriptionThe MAX6662 continuously converts its die temperature
into a digital value using its integrated ADC. Temperature
data is updated twice a second. The resulting data is
readable at any time through the SPI-compatible serial
interface.
Figure 1 shows the simplified functional diagram of the
MAX6662. Its internal current sources force 100µA and
10µA currents through a diode (diode-connected tran-
sistor), while the integrating ADC measures the voltage
difference. The difference in voltage corresponds to the
die temperature. The result is stored in the temperature
register. The control logic unit compares the temperature
and the temperature limit settings stored in the registers
to determine whether a fault condition has occurred.
Temperature Fault AlertThe ALERT is an open-drain active-low (default, also
programmable active-high) output used to alert the sys-
tem to temperature faults. ALERT can be programmed
to operate in either one of two modes: comparator or
interrupt mode.
Interrupt ModeIn the interrupt mode, the MAX6662 ALERT pin asserts
an alarm for an undertemperature (TLOW) fault, as well
as for an overtemperature (THIGH) fault. Once either fault
has occurred, it remains active indefinitely, regardless of
condition. ALERT is unconditionally deasserted (even if
temperature is still out of limits) by reading the tempera-
ture register. ALERT only asserts again if the temperature
crosses the hysteresis, thereby corresponding to the fault
PINNAMEFUNCTIONSCLKSerial-Clock InputCSChip Select Input. Set low to enable the serial interface for data input/output.SIOSerial-Data Input/Output. Bidirectional data input and output for serial interface.GNDGroundOTOvertemperature Output. Open-drain output requires a pullup resistor to VCC.ALERTAlert Output. Open-drain output requires a pullup resistor to VCC.NCNo Connection. Do not make a connection to this pin.VCCSupply Voltage Input. Bypass to GND with a 0.1µF capacitor as close to VCC as possible.
SHUTDOWN CURRENT
VS. TEMPERATURE
MAX6662 toc04
TEMPERATURE (°C)
SHUTDOWN CURRENT (VCC = +5.0V
VCC = +3.0V
VCC = +3.3V
MAX666212-Bit + Sign Temperature Sensor with
SPI-Compatible Serial Interface
Pin Description
Typical Operating Characteristics (continued)
For example: If THIGH is set to 100°C and THYST is set
to 20°C, ALERT does not assert until temperature
exceeds 100°C. If the temperature is then read through
the serial interface, ALERT deasserts. ALERT asserts
again when temperature is less than 80°C (Figure 2).
Comparator ModeIn the comparator mode, ALERT is asserted when
temperature exceeds the value in the THIGH register,
or is lower than the value in the TLOW register. ALERT
deasserts when temperature is less than THIGH - THYST
or greater than TLOW + THYST. Reading the registers
does not deassert ALERT.
For example: If THIGH is set to 100°C and TLOW is set
to 80°C, ALERT does not assert until temperature
exceeds 100°C, or is below 80°C. Then, ALERT only
deasserts if temperature is less than THIGH - THYST or
greater than TLOW + THYST.
Overtemperature AlertOT operates only in comparator mode. The OT pin is
asserted when the temperature exceeds TMAX, and
deasserted when the temperature drops below
TMAX - THYST. A read operation does not reset OT.
OT is an open-drain active-low (default) output, but can
be programmed to active-high.
Figure 2. Example of ALERT Operation in Interrupt Mode
Figure 1. MAX6662 Simplified Functional Diagram
THIGH - THYST
THIGH
TLOW
TLOW + THYST
ALERT
TEMPERATURE
LAST INTERRUPT MISSED, BUT
THRESHOLD STILL CHANGES TO THIGH.*** TEMPERATURE READ
TEMPERATURE
SERIAL INTERFACE
VCC
SIO
SCLK
CONFIGURATION
ALERT
TLOWTHIGHTMAXTHYST
12 -BIT
+ SIGN
ADC
MAX666212-Bit + Sign Temperature Sensor with
SPI-Compatible Serial Interface
Temperature Fault QueueThe activation of ALERT and OT is subject to the depth of
the fault queue. If the Fault Queue bit in the Configuration
register is enabled, ALERT or OT does not assert until
four consecutive temperature conversions are at fault.
For example: If THIGH is set to 100°C, THYST is set to
20°C, ALERT is set to interrupt mode, and fault queue is
enabled, ALERT does not assert until four consecutive
conversions exceed 100°C. If the temperature is then
read through the serial interface, ALERT deasserts.
ALERT asserts again when four consecutive conversions
are less than 80°C.
Shutdown ModeThe MAX6662 features a programmable shutdown
mode. Set the Shutdown bit in the Configuration register
to 1 to shut down. In the shutdown mode, everything is
disabled except the power-on reset (POR) and the seri-
al interface. In the shutdown mode, information stored
in all registers is retained. The temperature register
retains the temperature from the last conversion result.
Serial Interface ProtocolThe serial interface consists of three signal lines: chip
select (CS), bidirectional data line (SIO), and serial
clock (SCLK). Only the master (external) drives CS and
SCLK. Both the master and the MAX6662 drive SIO.
When CS is high, the MAX6662 does not respond to
any activity on clock and data lines. When CS goes low,
a transaction begins. A valid transaction has 24 clock
cycles provided from SCLK after CS goes low—no more
and no fewer. Any communication with more or fewer
than exactly 24 clocks is ignored. Data is clocked in to
the MAX6662 at the rising edge of SCLK when the mas-
ter is writing. Data is clocked out at the falling edge of
SCLK when the master is reading. Both the command
byte and data word are clocked in (or out) with the
most-significant bit (MSB) bit first. The first eight clock
cycles are dedicated to the command byte (1 bit per
cycle). This command byte is input to the MAX6662
through the SIO. Sixteen cycles of data follow. The 16
cycles of data are either driven by the master or by the
MAX6662, depending on the command byte. If the
MAX6662 is driving the SIO, it starts driving at the
falling edge of the eighth clock up until the rising edge
of CS. Data is available on the falling edge of the eighth
clock cycle. Figure 3 depicts a valid serial interface
transaction and Figure 4 is the serial interface timing
diagram.
Table 1. Bit Descriptions of the Configuration RegisterFigure 4. Detailed Serial Interface Timing Diagram
Figure 3. MAX6662 Serial Interface Operation
BITPORDESCRIPTION15 to 130Reserved. Writing to these bits is ignored.0Fault Queue bit. Set to 1 to enable queue.0ALERT polarity bit. Set to 1 for active-high ALERT output. Default is 0 for the ALERT output active-low.0OT polarity bit. Set to 1 for active-high OT output. Default is 0 for the OT output active-low.0Interrupt Mode bit. Set to 1 to enable the interrupt mode. Default is 0 for the comparator mode.0Shutdown bit. Set to 1 to shut down the MAX6662.
tCSStCSH
tCSW
tCHtCLtTR
tDS
tDO
SCLK
SIO
tDH23456789102324
DATA WORD (16 BITS)
SCLK
SIOCOMMAND BYTE (8 BITS)
MAX666212-Bit + Sign Temperature Sensor with
SPI-Compatible Serial Interface
