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MAX1031BEEG-T データシート(PDF) 15 Page - Maxim Integrated Products |
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MAX1031BEEG-T データシート(HTML) 15 Page - Maxim Integrated Products |
15 / 23 page 10-Bit 300ksps ADCs with FIFO, Temp Sensor, Internal Reference ______________________________________________________________________________________ 15 set to 1. Select scan mode 10 to scan the same channel multiple times. Clock mode 11 disables averaging. Reset Register Write to the reset register (as shown in Table 7) to clear the FIFO or to reset all registers to their default states. Set the RESET bit to 1 to reset the FIFO. Set the reset bit to zero to return the MAX1027/MAX1029/MAX1031 to its default power-up state. Power-Up Default State The MAX1027/MAX1029/MAX1031 power up with all blocks in shutdown, including the reference. All registers power up in state 00000000, except for the setup regis- ter, which powers up in clock mode 10 (CKSEL1 = 1). Temperature Measurements The MAX1027/MAX1029/MAX1031 perform tempera- ture measurements with an internal diode-connected transistor. The diode bias current changes from 68µA to 4µA to produce a temperature-dependent bias volt- age difference. The second conversion result at 4µA is subtracted from the first at 68µA to calculate a digital value that is proportional to absolute temperature. The output data appearing at DOUT is the above digital code minus an offset to adjust from Kelvin to Celsius. The reference voltage used for the temperature mea- surements is derived from the internal reference source to ensure a resolution of 1/8 of a degree. Output Data Format Figures 4–7 illustrate the conversion timing for the MAX1027/MAX1029/MAX1031. The 10-bit conversion result is output in MSB-first format with four leading zeroes and two trailing sub-bits. The 12-bit temperature measurement is output with four leading zeros. DIN data is latched into the serial interface on the rising edge of SCLK. Data on DOUT transitions on the falling edge of SCLK. Conversions in clock modes 00 and 01 are initiated by CNVST. Conversions in clock modes 10 and 11 are initiated by writing an input data byte to the conversion register. Data is binary for unipolar mode and two’s complement for bipolar mode. BIT NAME BIT FUNCTION UCH0/1 7 (MSB) Set to 1 to configure AIN0 and AIN1 for unipolar differential conversion. UCH2/3 6 Set to 1 to configure AIN2 and AIN3 for unipolar differential conversion. UCH4/5 5 Set to 1 to configure AIN4 and AIN5 for unipolar differential conversion. UCH6/7 4 Set to 1 to configure AIN6 and AIN7 for unipolar differential conversion. UCH8/9 3 Set to 1 to configure AIN8 and AIN9 for unipolar differential conversion (MAX1029/MAX1031 only). UCH10/11 2 Set to 1 to configure AIN10 and AIN11 for unipolar differential conversion (MAX1029/MAX1031 only). UCH12/13 1 Set to 1 to configure AIN12 and AIN13 for unipolar differential conversion (MAX1031 only). UCH14/15 0 (LSB) Set to 1 to configure AIN14 and AIN15 for unipolar differential conversion (MAX1031 only). Table 4. Unipolar Mode Register (Addressed Through Setup Register) BIT NAME BIT FUNCTION BCH0/1 7 (MSB) Set to 1 to configure AIN0 and AIN1 for bipolar differential conversion. BCH2/3 6 Set to 1 to configure AIN2 and AIN3 for bipolar differential conversion. BCH4/5 5 Set to 1 to configure AIN4 and AIN5 for bipolar differential conversion. BCH6/7 4 Set to 1 to configure AIN6 and AIN7 for bipolar differential conversion. BCH8/9 3 Set to 1 to configure AIN8 and AIN9 for bipolar differential conversion (MAX1029/MAX1031 only). BCH10/11 2 Set to 1 to configure AIN10 and AIN11 for bipolar differential conversion (MAX1029/MAX1031 only). BCH12/13 1 Set to 1 to configure AIN12 and AIN13 for bipolar differential conversion (MAX1031 only). BCH14/15 0 (LSB) Set to 1 to configure AIN14 and AIN15 for bipolar differential conversion (MAX1031 only). Table 5. Bipolar Mode Register (Addressed Through Setup Register) |
同様の部品番号 - MAX1031BEEG-T |
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同様の説明 - MAX1031BEEG-T |
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