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    • 參數(shù)資料
      型號(hào): NCN6001DTBR2
      廠商: ON Semiconductor
      文件頁數(shù): 6/36頁
      文件大?。?/td> 0K
      描述: IC INTERFACE SMART CARD 20TSSOP
      標(biāo)準(zhǔn)包裝: 1
      應(yīng)用: 智能卡
      接口: 微控制器
      電源電壓: 2.75 V ~ 5.5 V
      封裝/外殼: 20-TSSOP(0.173",4.40mm 寬)
      供應(yīng)商設(shè)備封裝: 20-TSSOP
      包裝: 標(biāo)準(zhǔn)包裝
      安裝類型: 表面貼裝
      其它名稱: NCN6001DTBR2OSDKR
      NCN6001
      http://onsemi.com
      14
      STARTUP DEFAULT CONDITIONS
      At startup, when the VCC power supply is turned on, the
      internal POR circuit sets the chip in the default conditions as
      defined in Table 4.
      Table 4. STARTUP DEFAULT CONDITIONS
      CRD_DET
      Normally Open
      CRD_VCC
      Off
      CRD_CLK
      tr and tf = SLOW
      CRD_CLK
      Low
      Protocol
      Special Mode
      CARD DETECTION
      The card is detected by the external switch connected pin
      18. The internal circuit provides a positive bias of this pin
      and the polarity of the insertion/extraction is programmable
      by the MOSI protocol as depicted in Table 2.
      The bias current is 1.0
      mA typical and care must be
      observed to avoid leakage to ground from this pin to
      maintain the logic function. In particular, using a low
      impedance probe (< 1.0 M
      W) may lead to uncontrolled
      operation during the debug.
      Depending upon the programmed condition, the card can
      be detected either by a Normally Open (default condition) or
      a Normally Close switch (Table 2). On the other hand, the
      meaning of the feedback message contained in the MISO
      register bit b4, depends upon the SPI mode of operation as
      defined here below:
      SPI Normal Mode: the MISO bit b4 is High when a card is
      inserted, whatever be the polarity of the card detect switch.
      SPI Special Mode: the MISO bit b4 copies the logic state of
      the Card detect switch as depicted here below, whatever be
      the polarity of the switch used to handle the detection:
      CRD_DET = Low MISO/b4 = Low
      CRD_DET = High MISO/b4 = High
      CRD_VCC OPERATION
      The builtin DC/DC converter provides the CRD_VCC
      voltage and can be programmed to run one of the three
      possible values, 1.8 V, 3.0 V or 5.0 V, assuming the input
      voltage VCC is within the 2.7 V to 5.5 V range. In any case,
      CRD_VCC is voltage regulated, together with a current
      overload detection. On the other hand, the power conversion
      is automatically switched to handle either a boost or a buck
      mode of operation, depending upon the difference between
      the input voltage VCC and the output supply CRD_VCC.
      The CRD_VCC output current is a function of the VCC
      input value as depicted in Table 5.
      Table 5. CRD_VCC OUTPUT VOLTAGE RANGE
      CRD_VCC
      Comments
      1.80 V
      Maximum Output DC Current = 35 mA
      3.0 V
      Maximum Output DC Current = 60 mA
      5.0 V
      Maximum Output DC Current = 65 mA
      Whatever the CRD_VCC output voltage may be, a
      builtin comparator makes sure the voltage is within the
      ISO78163/ EMV specifications. If the voltage is no longer
      within the minimum/maximum values, the DC/DC is
      switched Off, the Power Down sequence takes place and an
      interrupt is presented at the INT pin 2.
      POWERUP SEQUENCE
      The Powerup Sequence makes sure all the card related
      signals are Low during the CRD_VCC positive going slope.
      These lines are validated when CRD_VCC is above the
      minimum specified voltage (depending upon the
      programmed CRD_VCC value).
      Figure 4. Typical Startup CRD_VCC Sequence
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