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MAX6662MSA Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX6662MSA Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 9 page 12-Bit + Sign Temperature Sensor with SPI-Compatible Serial Interface 4 _______________________________________________________________________________________ 0 4 2 8 6 10 12 -50 50 0 100 150 SHUTDOWN CURRENT VS. TEMPERATURE TEMPERATURE ( °C) VCC = +5.0V VCC = +3.0V VCC = +3.3V Typical Operating Characteristics (continued) (VCC = +3V, TA = +25°C, unless otherwise noted.) Pin Description Detailed Description The MAX6662 continuously converts its die tempera- ture 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 tempera- ture and the temperature limit settings stored in the reg- isters to determine whether a fault condition has occurred. Temperature Fault Alert The 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 Mode In 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, regard- less of condition. ALERT is unconditionally deasserted (even if Temperature is still out of limits) by reading the temperature register. ALERT only asserts again if the temperature crosses the hysteresis, thereby corre- sponding to the fault (TLOW or THIGH) that initially set the ALERT. PIN NAME FUNCTION 1 SCLK Serial-Clock Input 2 CS Chip Select Input. Set low to enable the serial interface for data input/output. 3 SIO Serial-Data Input/Output. Bidirectional data input and output for serial interface. 4 GND Ground 5 OT Overtemperature Output. Open-drain output requires a pullup resistor to VCC. 6 ALERT Alert Output. Open-drain output requires a pullup resistor to VCC. 7 NC No Connection. Do not make a connection to this pin. 8VCC Supply Voltage Input. Bypass to GND with a 0.1µF capacitor as close to VCC as possible. |
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