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MAX6632MTT+ Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX6632MTT+ Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 8 page 12-Bit + Sign Digital Temperature Sensors with Serial Interface 6 _______________________________________________________________________________________ finish. CS’s falling edge stops any conversion in progress, and data is latched into the shift register. Then the data clocks out at SO on SCK’s falling edge with the sign bit (D15) first, followed by the MSB. Data is sent in one 16-bit word, and CS must remain low until all 16 bits are transferred. If CS goes high in the middle of a transmission, it is necessary to wait the conversion time (less than 300ms) before attempting a new read. The serial data is composed of 12 + 1 data bits (D15–D3) and 3 trailing bits (D2–D0). D2 is always low, serving as the confirmation bit that the device has been communicated with. The last 2 bits, D0 and D1, are undefined and are always in high-impedance mode (Table 1). The power-up state for SO is high imped- ance. Figure 3 shows the detailed serial timing specifi- cations for the SPI port. The temperature data format is in two's complement format (Table 2). Power Shutdown Mode The MAX6629–MAX6632 do not have a built-in power software shutdown mode. However, a power shutdown mode is easily implemented utilizing an unused logic gate. A typical CMOS or TTL logic output has enough drive capability to serve as the power source if its out- put voltage level exceeds 3V, as shown in Figure 1. Drive the logic output low to provide a hardware shut- down mode. Idle Mode The MAX6629–MAX6632 can be put into idle mode by pulling CS low. Data can be clocked out when the device is in idle mode. Power-On Reset (POR) The POR supply voltage of the MAX6629–MAX6632 is typically 1.6V. Below this supply voltage, the interface is inactive and the data register is set to the POR state, 0°C. When power is first applied and VCC rises above 1.6V (typ), the device starts to convert, although temperature reading is not recommended at VCC levels below 3.0V. Figure 3. SPI Timing Diagram D15 D0 D1 D2 D3 SCK SO tDV tCSS tDO CS tTR D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Sign MSB Data LSB Data Low High-Z High-Z Table 1. Data Output Format Table 2. Temperature Data Format (Two’s Complement) DIGITAL OUTPUT (BINARY) TEMPERATURE (°C) D15–D3 D2 D1, D0 150 0,1001,0110,0000 0 XX 125 0,0111,1101,0000 0 XX 25 0,0001,1001,0000 0 XX 0.0625 0,0000,0000,0001 0 XX 0 0,0000,0000,0000 0 XX -0.0625 1,1111,1111,1111 0 XX -25 1,1110,0111,0000 0 XX -55 1,1100,1001,0000 0 XX |
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