FN8102.3 April 14, 2006 The summary of conditions for backup battery operation is given in Table 9: Table 9. Battery Backup Operation *since Vb" />

        1. 參數(shù)資料
          型號: X1288V14-2.7AT1
          廠商: Intersil
          文件頁數(shù): 18/27頁
          文件大小: 0K
          描述: IC RTC/CAL/CPU SUP EE 14-TSSOP
          標(biāo)準(zhǔn)包裝: 2,500
          類型: 時鐘/日歷
          特點: 警報器,閏年,監(jiān)控器,監(jiān)視計時器
          時間格式: HH:MM:SS:hh(12/24 小時)
          數(shù)據(jù)格式: YY-MM-DD-dd
          接口: I²C,2 線串口
          電源電壓: 2.7 V ~ 5.5 V
          電壓 - 電源,電池: 1.8 V ~ 5.5 V
          工作溫度: 0°C ~ 70°C
          安裝類型: 表面貼裝
          封裝/外殼: 14-TSSOP(0.173",4.40mm 寬)
          供應(yīng)商設(shè)備封裝: 14-TSSOP
          包裝: 帶卷 (TR)
          25
          FN8102.3
          April 14, 2006
          The summary of conditions for backup battery operation is given in Table 9:
          Table 9. Battery Backup Operation
          *since Vback>2.65V is higher than Vtrip, the battery is powering the entire device
          Referring to Figure 20, Vtrip applies to the “Internal
          Vcc” node which powers the entire device. This means
          that if Vcc is powered down and the battery voltage at
          Vback is higher than the Vtrip voltage, then the entire
          chip will be running from the battery. If Vback falls to
          lower than Vtrip, then the chip shuts down and all out-
          puts are disabled except for the oscillator and time-
          keeping circuitry. The fact that the chip can be
          powered from Vback is not necessarily an issue since
          standby current for the RTC devices is <2A for this
          mode (called “main timekeeping current” in the data
          sheet). Only when the serial interface is active is there
          an increase in supply current, and with Vcc powered
          down, the serial interface will most likely be inactive.
          One way to prevent operation in battery backup mode
          above the Vtrip level is to add a diode drop (silicon
          diode preferred) to the battery to insure it is below
          Vtrip. This will also provide reverse leakage protection
          which may be needed to get safety agency approval.
          One mode that should always be avoided is the opera-
          tion of the RTC device with Vback greater than both
          Vcc and Vtrip (Condition 2d in Table 9). This will cause
          the battery to drain quickly as serial bus communica-
          tion and non-volatile writes will require higher supplier
          current.
          PERFORMANCE DATA
          IBACK Performance
          1. Example Application, Vcc=5V, Vback=3.0V
          Condition
          Vcc
          Vback
          Vtrip
          Iback
          Reset
          Notes
          a. Normal Operation
          5.00
          3.00
          4.38
          <<1A
          H
          b. Vcc on with no battery
          5.00
          0
          4.38
          0
          H
          c. Backup Mode
          0–1.8
          1.8-3.0
          4.38
          <2A
          L
          Timekeeping
          only
          2. Example Application, Vcc=3.3V,Vback=3.0V
          Condition
          Vcc
          Vback
          Vtrip
          Iback
          Reset
          a. Normal Operation
          3.30
          3.00
          2.65
          <<1A
          H
          b. Vcc on with no battery
          3.30
          0
          2.65
          0
          H
          c. Backup Mode
          0–1.8
          1.8–3.0*
          2.65
          <2A*
          L
          Timekeeping
          only
          d. UNWANTED - Vcc ON, Vback
          powering
          2.65 - 3.30
          > Vcc
          2.65
          up to 3mA
          H
          Internal
          Vcc=Vback
          1.4
          1.2
          1.0
          0.8
          0.6
          0.4
          0.2
          0
          IBACK vs. Temperature
          Multi-Lot Process Variation Data
          Temperature °C
          -40
          25
          60
          85
          I BACK
          (A)
          3.3V
          1.8V
          X1288
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