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1 of 14 012402

FEATURES

§ Temperature measurements require no

external components

§ Measures temperatures from -55°C to +125°C

(-67°F to +257°F)

§ ±0.5°C accuracy over a range of 0°C to

+70°C

§ Output resolution is user-selectable to 9, 10,

11, or 12 bits

§ Wide power-supply range (2.7V to 5.5V)

§ Converts temperature to digital word in

750ms (max)

§ Multidrop capability simplifies distributed

temperature-sensing applications

§ Thermostatic settings are user-definable and

nonvolatile (NV)

§ Data is read/written through a 2-wire serial

interface (SDA and SCL pins)

§ Applications include thermostatic controls,

industrial systems, consumer products,

thermometers, or any thermally sensitive

system

§ Available in 8-pin SO (150mil) and mSOP

packages

PIN ASSIGNMENT

PIN DESCRIPTION

SDA - Open-Drain Data I/O

SCL - Clock Input

OUT

- Thermostat Output

GND - Ground

- Power Supply (2.7V to 5.5V)

- Address Input

DESCRIPTION

The DS1631 digital thermometer and thermostat provides 9-, 10-, 11-, or 12-bit digital temperature

readings over a range of -55°C to +125°C. The thermometer accuracy is ±0.5°C from 0°C to +70°C with

3.0V £ V

£ 5.5V. The thermostat provides custom hysteresis with user-defined trip points (T

and T

The thermostat output (T

OUT

) becomes active when the temperature of the device exceeds the upper

thermostat trip point (T

), and remains active until the temperature drops below the lower thermostat trip

point (T

The T

and T

registers and thermometer configuration settings are stored in NV EEPROM so the

DS1631 can be programmed prior to installation. Communication with the DS1631 is achieved through a

standard 2-wire serial interface.

DS1631

±0.5°C Accuracy Digital Thermomete

and Thermostat

www.maxim-ic.com

DS1631Z—8-pin SO (150mil)

DS1631U—

SOP

GND

OUT

DS1631Z

GND

OUT

D1631

Summary of content (14 pages)

PAGE 1
DS1631 ±0.5°C Accuracy Digital Thermometer and Thermostat www.maxim-ic.com FEATURES § § § § § § § § § 1 SCL 2 TOUT 3 GND 4 8 VDD 7 A0 6 A1 5 A2 DS1631Z—8-pin SO (150mil) SDA 1 SCL 2 TOUT GND 3 D1631 § SDA DS1631Z § PIN ASSIGNMENT Temperature measurements require no external components Measures temperatures from -55°C to +125°C (-67°F to +257°F) ±0.
PAGE 2
DS1631 DETAILED PIN DESCRIPTION Table 1 PIN 1 2 3 4 5 6 7 8 SYMBOL SDA SCL TOUT GND A2 A1 A0 VDD DESCRIPTION Data input/output pin for 2-wire serial communication port. Open drain. Clock input pin for 2-wire serial communication port. Thermostat output pin. Push-pull. Ground pin. Address input pin. Address input pin. Address input pin. Supply Voltage. 2.7V to 5.5V input power pin.
PAGE 3
DS1631 OVERVIEW The DS1631 measures temperature using a bandgap-based temperature sensor. A delta-sigma analog-todigital converter (ADC) converts the measured temperature to a 9-, 10-, 11-, or 12-bit (user-selectable) digital value that is calibrated in degrees centigrade; for Fahrenheit applications a lookup table or conversion routine must be used. The DS1631 also provides thermostat capability with userprogrammable NV trip-point registers.
PAGE 4
DS1631 TEMPERATURE, TH, and TL REGISTER FORMAT Figure 2 bit 15 MS Byte LS Byte bit 14 6 S 2 bit 7 bit 6 -1 2 -2 2 bit 13 5 bit 12 4 bit 11 bit 3 bit 2 bit 1 bit 0 0 0 0 0 bit 5 bit 4 2 2 -4 1 bit 8 20 2 2 bit 9 2 2 -3 bit 10 2 2 3 12-BIT RESOLUTION TEMPERATURE/DATA RELATIONSHIP Table 3 TEMPERATURE (°C) +125 +25.0625 +10.125 +0.5 0 -0.5 -10.125 -25.
PAGE 5
DS1631 THERMOSTAT OUTPUT OPERATION Figure 3 POL=1 (TOUT is active high) TOUT Logic 1 Logic 0 TL Temp TH CONFIGURATION REGISTER The configuration register allows the user to program various DS1631 options such as conversion resolution, TOUT polarity, and operating mode. It also provides information to the user about conversion status, EEPROM activity, and thermostat activity. The configuration register is arranged as shown in Figure 4 and detailed descriptions of each bit are provided in Table 5.
PAGE 6
DS1631 CONFIGURATION REGISTER BIT DESCRIPTIONS Table 5 BIT NAME (USER ACCESS) DONE—Temperature Conversion Done (Read Only) THF—Temperature High Flag (Read/Write) TLF—Temperature Low Flag (Read/Write) NVB—NV Memory Busy (Read Only) R1—Resolution Bit 1 (Read/Write) R0—Resolution Bit 0 (Read/Write) POL*— TOUT Polarity (Read/Write) 1SHOT*— Conversion Mode (Read/Write) FUNCTIONAL DESCRIPTION Power-up/POR state = 1 DONE = 0—Temperature conversion is in progress. DONE = 1—Temperature conversion is complete.
PAGE 7
DS1631 2-WIRE SERIAL DATA BUS The DS1631 communicates over a standard bidirectional 2-wire serial data bus that consists of a serial clock (SCL) signal and serial data (SDA) signal. The DS1631 interfaces to the bus through the SCL input pin and open-drain SDA I/O pin. The following terminology is used to describe 2-wire communication: Master Device: Microprocessor/microcontroller that controls the slave devices on the bus. The master device generates the SCL signal and START and STOP conditions.
PAGE 8
DS1631 GENERAL 2-WIRE INFORMATION § All data is transmitted MSb first over the 2-wire bus. § A pullup resistor is required on the SDA line and, when the bus is idle, both SDA and SCL must remain in a logic-high state. § All bus communication must be initiated with a START condition and terminated with a STOP condition. During a START or STOP is the only time SDA is allowed to change states while SCL is high.
PAGE 9
1 START S 0 1 A 1 START S 0 1 A 1 ACK (DS1631) A2 A1 A0 W Control Byte 0 0 9 of 14 1 START S 0 1 SCL 1 START S 0 1 A 0 1 SDA SCL 1 START S 0 1 A 0 1 1 Command Byte 1 Command Byte A 0 A Command Byte S 1 1 A2 A1 A0 Control Byte 0 ACK Repeat (DS1631) START S 1 0 1 A A A … … ACK (Master) … … LS Data Byte (from DS1631) N P NACK STOP (Master) D7 D6 D5 D4 D3 D2 D1 D0 MS Data Byte (from DS1631) P STOP ACK STOP (DS1631) D7 D6 D5 D4 D3 D2 D1 D0 A
PAGE 10
DS1631 DS1631 COMMAND SET The DS1631 command set is detailed below and is summarized in Table 6. Start Convert T [ 51h ] Initiates temperature conversions. If the part is in one-shot mode (1SHOT = 1), only one conversion will be performed. In continuous mode (1SHOT = 0), continuous temperature conversions will be performed until a Stop Convert T command is issued. Stop Convert T [ 22h ] Stops temperature conversions when the device is in continuous conversion mode (1SHOT = 0).
PAGE 11
DS1631 NOTES: 1) If only one byte of temperature data is needed, the master can issue a NACK followed by a STOP after reading the first data byte, and the DS1631 will quit transmitting data. 2) After issuing a write command, no further writes should be requested for at least 10ms due to the EEPROM write cycle time. 3) Data direction depends upon R/ W bit in the 2-wire control byte.
PAGE 12
DS1631 ABSOLUTE MAXIMUM RATINGS* Voltage on any Pin Relative to Ground Operating Temperature Range Storage Temperature Range Solder Dip Temperature (10s) Reflow Oven Temperature -0.5V to +6.0V -55°C to +125°C -55°C to +125°C +260°C +220°C * These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied.
PAGE 13
DS1631 EEPROM AC ELECTRICAL CHARACTERISTICS (-55°C to +100°C; VDD = 2.7V to 5.5V) PARAMETER EEPROM Write Cycle Time EEPROM Writes EEPROM Data Retention SYMBOL twr NEEWR tEEDR CONDITIONS MIN -55°C to +55°C -55°C to +55°C 50k 10 AC ELECTRICAL CHARACTERISTICS PARAMETER Temperature Conversion Time SYMBOL tTC TYP 4 MAX 10 UNITS ms writes years (-55°C to +125°C; VDD = 2.7V to 5.5V) CONDITION 9-bit resolution 10-bit resolution 11-bit resolution 12-bit resolution MIN TYP MAX 93.75 187.
PAGE 14
DS1631 TYPICAL PERFORMANCE CURVE Figure 7 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.