Datasheet

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General Description

The MAX6629–MAX6632 are local digital temperature

sensors with an SPI-compatible serial interface. The

temperature is converted to a 12-bit + sign word with a

resolution of 0.0625°C/LSB. An extended temperature

range provides useful readings up to +150°C.

These sensors are 3-wire serial interface SPI compatible,

allowing the MAX6629–MAX6632 to be readily connected

to a variety of microcontrollers (μCs). The MAX6629–

MAX6632 are read-only devices, simplifying their use in

systems where only temperature data is required.

All four digital temperature sensors require very little

supply current, making them ideal for portable systems.

The MAX6631/MAX6632 perform a temperature-to-digital

conversion once every 8s and require minimal average

supply current, 32μA (typ). The MAX6629/MAX6630

perform a conversion once every 0.5s and require only

200μA (typ) supply current. Any of these temperature

sensors can perform conversions more often—up to

approximately four conversions per second by reading the

conversion results more often.

Applications

Features

● Low Power Consumption

• 32μA typ (MAX6631/MAX6632)

• 200μA typ (MAX6629/MAX6630)

● 12-Bit + Sign Resolution with 0.0625°C/LSB

● Accuracy

• ±1°C (max) from 0°C to +70°C

● +150°C Extended Temperature Range

● SPI-Compatible Serial Interface

● +3.0V to +5.5V Supply Range

● 6-Pin TDFN and SOT23 Packages

● Lead-Free Version Available (TDFN Package)

19-2047; Rev 5; 10/14

● Cellular

● Hard Disk Drive

● HVACs

● Industrial Control

● Systems

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

PART TEMP RANGE PIN-PACKAGE

MAX6629MTT+ -55°C to +125°C 6 TDFN-EP*

MAX6629MUT -55°C to +125°C 6 SOT23-6

MAX6630MTT+ -55°C to +125°C 6 TDFN-EP*

MAX6630MUT -55°C to +125°C 6 SOT23-6

MAX6631MTT+ -55°C to +125°C 6 TDFN-EP*

MAX6631MUT -55°C to +125°C 6 SOT23-6

MAX6632MTT+ -55°C to +125°C 6 TDFN-EP*

MAX6632MUT -55°C to +125°C 6 SOT23-6

GND

SCKV

1 6 SO

N.C.

MAX6629

MAX6631

SOT23

TDFN

TOP VIEW

3 4

N.C.

SCKV

1 6 SO

GND

MAX6630

MAX6632

SOT23

TDFN

3 4

GND

SCK

µC

+3V TO +5.5V

0.1µF

MAX6629

MAX6630

MAX6631

MAX6632

MAX6629–MAX6632 12-Bit + Sign Digital Temperature Sensors

with Serial Interface

Ordering Information

Typical Application Circuit

Pin Congurations

Summary of content (8 pages)

PAGE 1
MAX6629–MAX6632 12-Bit + Sign Digital Temperature Sensors with Serial Interface General Description The MAX6629–MAX6632 are local digital temperature sensors with an SPI-compatible serial interface. The temperature is converted to a 12-bit + sign word with a resolution of 0.0625°C/LSB. An extended temperature range provides useful readings up to +150°C. These sensors are 3-wire serial interface SPI compatible, allowing the MAX6629–MAX6632 to be readily connected to a variety of microcontrollers (μCs).
PAGE 2
MAX6629–MAX6632 12-Bit + Sign Digital Temperature Sensors with Serial Interface Absolute Maximum Ratings All voltages referenced to GND. VCC...........................................................................-0.3V, +6.0V SO, SCK, CS....................................................-0.3V, VCC + 0.3V SO .......................................................................-1mA to +50mA Current into Any Pin ............................................................
PAGE 3
MAX6629–MAX6632 12-Bit + Sign Digital Temperature Sensors with Serial Interface Electrical Characteristics (continued) (VCC = +3.0V to +5.5V, TA = -55°C to +125°C, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.) (Notes 2 and 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS LOGIC INPUTS (CS, SCK) Logic Input Low Voltage VIL Logic Input High Voltage VIH Input Leakage Current ILEAK 0.3 x VCC 0.7 x VCC VIN = VGND or +5.5V V V ±1 ±5 µA 0.
PAGE 4
MAX6629–MAX6632 12-Bit + Sign Digital Temperature Sensors with Serial Interface Typical Operating Characteristics (VCC = +3.3V, TA = +25°C, unless otherwise noted.) VCC = +3.3V 250 VCC = +3.6V VCC = +3.0V 200 150 100 MAX6629 -55 -30 -5 20 45 70 95 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 120 145 -55 -30 TEMPERATURE (°C) 45 70 95 2 1 0 -1 -2 -3 -4 120 145 MAX6629 -55 -30 -5 TEMPERATURE (°C) VIN = SQUARE WAVE APPLIED TO VCC WITH NO 0.
PAGE 5
MAX6629–MAX6632 12-Bit + Sign Digital Temperature Sensors with Serial Interface Detailed Description The MAX6629–MAX6632 are local digital temperature sensors with a serial bus. The MAX6629–MAX6632 are typically interfaced to a μC in temperature sensing and control applications. The MAX6629–MAX6632 convert temperature to a 12-bit + sign word with a 0.0625°C LSB. The data is communicated through a simple serial interface with a CS (chip select) line, SO (data) line, and SCK (clock) line.
PAGE 6
MAX6629–MAX6632 12-Bit + Sign Digital Temperature Sensors with Serial Interface tCSS CS SCK tDV tDO tTR SO D15 D3 D2 D1 D0 Figure 3. SPI Timing Diagram Table 1. Data Output Format D15 D14 Sign MSB Data D13 D12 D11 D10 D9 D8 Table 2. Temperature Data Format (Two’s Complement) D15–D3 D2 D1, D0 0,1001,0110,0000 0 XX 125 0,0111,1101,0000 0 XX 25 0,0001,1001,0000 0 XX 0.0625 0,0000,0000,0001 0 XX 150 0 0,0000,0000,0000 0 XX -0.
PAGE 7
MAX6629–MAX6632 Thermal Considerations The key to accurate temperature monitoring is good thermal contact between the MAX6629–MAX6632 package and the object being monitored. In some applications, the 6-pin SOT23 package is small enough to fit underneath a socketed μP, allowing the device to monitor the μP’s temperature directly. Accurate temperature monitoring depends on the thermal resistance between the object being monitored and the MAX6629–MAX6632 die.
PAGE 8
MAX6629–MAX6632 12-Bit + Sign Digital Temperature Sensors with Serial Interface Revision History REVISION NUMBER REVISION DATE 0 5/01 Initial release of MAX6629 1 7/01 Initial release of MAX3360, MAX3361, and MAX3362; changed ICONV from 600µA (max) to 650µA (max) in the Electrical Characteristics table 2 4/04 Changed the lead temperature in the Absolute Maximum Ratings section, replacing Note 2 with +300°C (removed the JEDEC solder reflow boiler plating due to high temp solder paste for flip chi