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MAX6625 Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX6625 Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 13 page 9-Bit/12-Bit Temperature Sensors with I2C-Compatible Serial Interface in a SOT23 _______________________________________________________________________________________ 5 Detailed Description The MAX6625/MAX6626 continuously convert their die temperatures into digital values using their self-con- tained delta-sigma ADCs. The resulting data is read- able at any time through the I2C-compatible serial interface. A dedicated alarm output asserts if the result exceeds the value in the programmable high-tempera- ture register. A programmable fault queue sets the number of faults that must occur before the alarm asserts, preventing spurious alarms in noisy environ- ments. The alarm output polarity is selectable and deasserts based on either of two operating modes, comparator or interrupt. In comparator mode, the OT output deasserts if the temperature conversion result falls below the programmable low-temperature register value (subject to the fault queue conditions) providing adjustable hysteresis. In interrupt mode, the OT output deasserts when any register is read through the serial interface. Each conversion cycle takes about 130ms. At power-up, the temperature register is set to 8000H until the first conversion is completed. The MAX6625/MAX6626 feature a shutdown mode, accessible through the serial interface, that saves power by turning off everything but the power-on reset and the I2C-compatible interface. While in shutdown mode the temperature register is set to 8000H. The device func- tions as a slave on the I2C-compatible bus supporting Write Byte, Write Word, Read Byte, and Read Word com- mands. Four separate addresses can be configured with the ADD pin, allowing up to four MAX6625/MAX6626 devices to be placed on the same bus. Figure 2 shows the functional block diagram of the MAX6625/MAX6626. Serial interface I2C-Compatible Operation The MAX6625/MAX6626 are readable and programma- ble through their I2C-compatible serial interface. Figures 3 and 4 show the timing details of the clock (SCL) and data (SDA) signals. The device functions as a slave on the I2C-compatible bus and supports Write Byte, Write Word, Read Byte, and Read Word com- mands. Addressing Four separate addresses can be configured with the ADD pin, allowing up to four MAX6625/MAX6626s to be placed on the same bus. The address is selected by connecting the ADD pin to either of four places: GND (address 0), VS (address 1), SDA (address 2), or SCL (address 3). Table 1 shows the full I2C-compatible address for each state. MAX6625 MAX6626 TEMPERATURE REGISTER THIGH REGISTER +Vs OT GND SDA SCL ADD SERIAL BUS INTERFACE TLOW REGISTER SET-POINT COMPARATOR ADDRESS POINTER REGISTER BANDGAP REGISTER ADC REFERENCE TEMP SIGNAL FAULT QUEUE COUNTER CONFIGURATION REGISTER MAX665_ R ONLY Figure 2. Functional Block Diagram |
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