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MAX6629MTT+ Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX6629MTT+ Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 8 page 12-Bit + Sign Digital Temperature Sensors with Serial Interface _______________________________________________________________________________________ 5 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. This interface can be directly connected to, and is fully compatible with, SPI inter- faces. This interface can also be connected to virtually any processor, which has at least three general-pur- pose input/output (GPIO) lines available to implement software “bit banging.” The high resolution of the MAX6629–MAX6632 makes them especially useful in thermal control loops, HVAC systems, or in any system where quick anticipation of temperature trends is useful. The MAX6629–MAX6632 can produce temperature data in excess of +150°C, although they are specified for a maximum operating temperature of +150°C. This extended temperature range makes it especially useful in automotive under- hood applications. The low power consumption is also ideal in battery-operated and portable applications. The MAX6631/MAX6632 are optimized for minimum power consumption with their 8s conversions. The MAX6629/MAX6630 provide faster conversions, 0.5s, at the expense of power consumption. The low quiescent supply current enables the device to be powered from a logic line or the output of a gate where the high level exceeds 3V, as shown in Figure 1.While the MAX6629–MAX6632 are not specifically equipped with a software shutdown mode, the hardware shutdown can easily be implemented by setting the gate output to low. Pulling CS low without a clock also puts the device in idle mode. Take care to ensure that the logic output is not noisy, as excessive noise on VCC can affect tem- perature measurement accuracy. ADC Conversion Sequence The MAX6629–MAX6632 continuously convert temper- ature to digital data. Setting CS low stops any conver- sion in progress, places the device in idle mode, and makes data available for reading. Setting CS high starts a new conversion. CS must remain high for at least 0.3s to allow for the conversion to be completed. Figure 2 shows the timing relationship between conversion time and conversion rate. SPI Digital Interface The MAX6629–MAX6632 are compatible with SPI seri- al-interface standards (Figure 3) and are designed to be read-only devices. CS’s rising edge always starts a new conversion and resets the interface. CS must stay high for a minimum of 300ms to allow the conversion to Figure 2. Conversion Time and Rate Relationships MAX6629 MAX6630 MAX6631 MAX6632 0.25s ADC CONVERSION TIME MAX6631 MAX6632 CONVERSION PERIOD 8s MAX6629 MAX6630 CONVERSION PERIOD 0.5s 0.25s ADC CONVERSION TIME Figure 1. Powering the Sensor from a Logic Gate LOGIC LINE WHERE VLOGIC > 3V MAX6629 MAX6630 MAX6631 MAX6632 VCC SO GND SCK CS |
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