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ADE7569 数据表(PDF) 73 Page - Analog Devices |
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ADE7569 数据表(HTML) 73 Page - Analog Devices |
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73 / 144 page  ADE7566/ADE7569/ADE7166/ADE7169 Rev. A | Page 73 of 144 TEMPERATURE, BATTERY, AND SUPPLY VOLTAGE MEASUREMENTS The ADE7566/ADE7569/ADE7166/ADE7169 include temperature 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 low battery detection to be performed. All ADC measurements are configured through the SFRs detailed in Table 47. The temperature, battery, and supply voltage measurements can be configured to continue functioning in PSM1 and PSM2. 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 47. Temperature, Battery, and Supply Voltage Measurement SFRs SFR Address R/W Name Description 0xF9 R/W STRBPER Peripheral ADC Strobe Period (see Table 48). 0xF3 R/W DIFFPROG Temperature and Supply Delta Configuration (see Table 49). 0xD8 R/W ADCGO Start ADC Measurement (see Table 50). 0xFA R/W BATVTH Battery Detection Threshold (see Table 51). 0xEF R/W VDCINADC VDCIN ADC Value (see Table 52). 0xDF R/W BATADC Battery ADC Value (see Table 53). 0xD7 R/W TEMPADC Temperature ADC Value (see Table 54). Table 48. Peripheral ADC Strobe Period SFR (STRBPER, 0xF9)1 Bit Mnemonic Default Description 7 to 6 Reserved 00 These bits should be left clear for proper operation. Period for background external voltage measurements. VDCIN_PERIOD[1:0] Result 00 No VDCIN measurement 01 8 min 10 2 min 5 to 4 VDCIN_PERIOD[1:0] 0 11 1 min Period for background battery level measurements. BATT_PERIOD[1:0] Result 00 No battery measurement 01 16 min 10 4 min 3 to 2 BATT_PERIOD[1:0] 0 11 1 min Period for background temperature measurements. TEMP_PERIOD[1:0] Result 00 No temperature measurements 01 8 min 10 2 min 1 to 0 TEMP_PERIOD[1:0] 0 11 1 min 1 The strobing option only works when the RTCEN bit in RTC Configuration SFR (TIMECON, 0xA1) is set. |
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