DS1631U Maxim Integrated Products, DS1631U Datasheet
DS1631U
Specifications of DS1631U
Available stocks
Related parts for DS1631U
DS1631U Summary of contents
Page 1
... Pin descriptions for the DS1631/DS1631A/DS1731 are provided in Table 2 and user-accessible registers are summarized in Table 3. A functional diagram is shown in Figure 1. Thermometer and Thermostat PIN CONFIGURATIONS SDA SCL T GND (DS1631U+, DS1631AU+, SDA SCL T GND See Table 2 for Pin Descriptions APPLICATIONS Network Routers and Switches ...
Page 2
... DS1631AU+T&R 1631A (See Note) DS1631S+ DS1631S (See Note) DS1631 in Lead-Free 208 mil 8-Pin SO DS1631S+T&R DS1631S (See Note) DS1631+ DS1631 (See Note) DS1731U+ D1731 (See Note) DS1731U+T&R D1731 (See Note) DS1631U D1631 DS1631U/T&R D1631 DS1631Z DS1631Z DS1631Z/T&R DS1631Z DS1631AU 1631A DS1631AU/T&R 1631A DS1631S DS1631S DS1631S/T&R ...
Page 3
Figure 1. FUNCTIONAL DIAGRAM V DD SCL SDA ADDRESS AND I/O CONTROL GND ABSOLUTE MAXIMUM RATINGS* Voltage on any Pin Relative to Ground Operating Temperature Range Storage Temperature Range Solder Dip Temperature (10s) Reflow ...
Page 4
DC ELECTRICAL CHARACTERISTICS PARAMETER SYMBOL Supply Voltage V DD DS1631, DS1631A T ERR Thermometer Error DS1731 T ERR Thermometer Error Low-Level Input V IL Voltage High-Level Input V IH Voltage SDA Low-Level V OL1 Output Voltage V OL2 Input Current ...
Page 5
AC ELECTRICAL CHARACTERISTICS PARAMETER SYMBOL Temperature t TC Conversion Time SCL Frequency f SCL Bus Free Time Between a STOP and t BUF START Condition START and Repeated START Hold Time t HD:STA from Falling SCL Low Period of SCL ...
Page 6
EEPROM AC ELECTRICAL CHARACTERISTICS PARAMETER EEPROM Write Cycle Time EEPROM Writes EEPROM Data Retention Figure 2. TYPICAL OPERATING CURVES DS1631/DS1631A 0.8 0.6 0.4 0.2 +3 σ 0 Mean -0.2 -3 σ -0.4 -0.6 -0 REFERENCE ...
Page 7
Table 3. REGISTER SUMMARY REGISTER NAME SIZE (USER ACCESS) (BYTES) Temperature 2 (Read Only (Read/Write (Read/Write) Configuration (Various bits are 1 Read/Write and Read Only—See Table 5) OPERATION—MEASURING TEMPERATURE The DS1631, DS1631A, and DS1731 ...
Page 8
Bits 3 through 0 of the temperature register are hardwired to 0. When the device is configured for 12-bit resolution, the 12 MSbs (bits 15 through 4) of the temperature register contain temperature ...
Page 9
Access TL commands. When making changes to the T stopped using the Stop Convert T command if the device is in continuous conversion mode. Note that if the thermostat function is not used, the T Another thermostat feature is ...
Page 10
Table 5. CONFIGURATION REGISTER BIT DESCRIPTIONS 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*—T Polarity OUT (Read/Write) ...
Page 11
SERIAL DATA BUS The DS1631, DS1631A, and DS1731 communicate over a bidirectional 2-wire serial data bus that consists of a serial clock (SCL) signal and serial data (SDA) signal. The DS1631, DS1631A, and DS1731 interface to the bus through ...
Page 12
Figure 8. START, STOP, AND ACK SIGNALS SDA SCL START Condition GENERAL 2-WIRE INFORMATION All data is transmitted MSb first over the 2-wire bus. One bit of data is transmitted on the 2-wire bus each SCL period. A pullup resistor ...
Page 13
READS The master can read data from the DS1631/DS1631A/DS1731 by issuing an Access Config, Access TH, Access TL, or Read Temperature command following the control byte (see Figures 9c and 9e). After receiving an ACK in response to the ...
Page 14
Figure 9 ( e). 2-WIRE INTERFACE TIMING THERM = DS1631, DS1631A, or DS1731 DS1631/DS1631A/DS1731 ...
Page 15
OPERATION EXAMPLE In this example, the master configures the DS1631/DS1631A/DS1731 (A conversions and thermostatic function. MASTER THERMETER* MODE MODE ...