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ADE5569 データシート(PDF) 74 Page - Analog Devices |
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ADE5569 データシート(HTML) 74 Page - Analog Devices |
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74 / 156 page  ADE5166/ADE5169/ADE5566/ADE5569 Rev. B | Page 74 of 156 TEMPERATURE, BATTERY, AND SUPPLY VOLTAGE MEASUREMENTS The ADE5166/ADE5169/ADE5566/ADE5569 include tem- perature measurements as well as battery and supply voltage measurements. These measurements enable many forms of compensation. The temperature and supply voltage measurements can be used to compensate external circuitry. The RTC can be calibrated over temperature to ensure that it does not drift. Supply voltage measurements allow the LCD contrast to be maintained despite variations in voltage. Battery measurements allow for low battery detection. All ADC measurements are configured through the SFRs, as shown in Table 49. The temperature, battery, and supply voltage measurements can be configured to continue functioning in PSM1 and PSM2 modes. Keeping the temperature measurement active ensures that it is not necessary to wait for the temperature measurement to settle before using it for compensation. Table 49. Temperature, Battery, and Supply Voltage Measurement SFRs SFR Address R/W Mnemonic Description 0xF9 R/W STRBPER Peripheral ADC strobe period (see Table 50). 0xF3 R/W DIFFPROG Temperature and supply delta (see Table 51). 0xD8 R/W ADCGO Start ADC measurement (see Table 52). 0xFA R/W BATVTH Battery detection threshold (see Table 53). 0xEF R/W VDCINADC VDCINADC value (see Table 54). 0xDF R/W BATADC Battery ADC value (see Table 55). 0xD7 R/W TEMPADC Temperature ADC value (see Table 56). Table 50. Peripheral ADC Strobe Period SFR (STRBPER, Address 0xF9) Bit Mnemonic Default Description [7:6] Reserved 00 These bits must be kept at 0 for proper operation. [5:4] VDCIN_PERIOD 00 Period for background external voltage measurements. VDCIN_PERIOD Result 00 No VDCIN measurement 01 8 min 10 2 min 11 1 min [3:2] BATT_PERIOD 00 Period for background battery level measurements. BATT_PERIOD Result 00 No battery measurement 01 16 min 10 4 min 11 1 min [1:0] TEMP_PERIOD 00 Period for background temperature measurements. TEMP_PERIOD Result 00 No temperature measurement 01 8 min 10 2 min 11 1 min |
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