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MAX1756BAUT-T Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX1756BAUT-T Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 11 page Chip Information TRANSISTOR COUNT: 2963 SOT23 Local Temperature Comparators with SMBus Serial Interface 10 ______________________________________________________________________________________ TOP VIEW SMBDATA SMBCLK 16 GND 5 VCC ADD MAX1755 SOT23 2 34 OVERT SMBDATA SMBCLK 16 GND 5 VCC ADD MAX1756 SOT23 2 34 ALERT Pin Configurations Listing 1. Measuring Temperature by Successive Approximation /* Use successive approximation to measure the ambient temperature. ** Returns the measured temperature in degrees C. ** ** global variables: ** __int8 shadow_command contains the last command we wrote ** __int8 shadow_status contains the last status value we read ** ** External functions: ** SMBusSendByte(__int8 address, __int8 command); ** SMBusReceiveByte(__int8 address, __int8* received_data); ** Delay_msec(int delay_time_msec); */ int MeasureTemperature() { /* Write a test temperature, then read the status byte. ** Use the state of the OVER bit to determine each successive bit. */ signed __int8 Thi = 127; /*upper limit starts at maximum */ signed __int8 Tlo = -128; /*lower limit starts at minimum */ while ( (Thi - Tlo) > 0 ) { signed __int8 Ttest = (Thi + Tlo) / 2; /* guess between Thi and Tlo */ SMBusSendByte(address, Ttest); /* set new threshold */ shadow_command = Ttest; Delay_msec(SAR_delay_time); SMBusReceiveByte(address, &shadow_status); /* get status byte */ if (shadow_status & 0x80) { /* over temperature? */ if (Tlo == Ttest) break; /* close enough, exit loop */ Tlo = Ttest; /* move lower limit up */ } else { /* not over temperature */ if (Thi == Ttest) break; /* close enough, exit loop */ Thi = Ttest; /* move upper limit down */ } } return Ttest*2; /* temperature in degrees C = twice the threshold number */ } |
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