參數(shù)資料
型號(hào)： NCN6000DTBR2G
廠商： ON Semiconductor
文件頁(yè)數(shù)： 6/36頁(yè)
文件大?。?/td> 0K
描述： IC INTERFACE SMART CARD 20TSSOP
產(chǎn)品變化通告： Product Obsolescence 01/Jul/2009
標(biāo)準(zhǔn)包裝： 1
應(yīng)用： ATM 終端，氣泵，ISM
接口： 微控制器
電源電壓： 2.7 V ~ 6 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： 剪切帶 (CT)
安裝類型： 表面貼裝
其它名稱： NCN6000DTBR2GOSCT
NCN6000
http://onsemi.com
14
DCDC Converter and Card Detector Status
The NCN6000 status can be polled when CS = L. Please
consult Figures 4 and 5 for a description of input and output
signals. The status message is described in Table 4.
Note: in order to cope with a start up under low battery
condition, the Vbat OK message uses a negative logic as
depicted here below.
Table 4. Card and DCDC Status Output
PGM
A1
A0
STATUS
Message
HIGH
L
LOW
No Card
HIGH
L
HIGH
Card Present
HIGH
L
H
LOW
DCDC Converter
Overloaded
HIGH
L
H
HIGH
DCDC Converter OK
HIGH
H
L
LOW
Vbat OK
HIGH
H
L
HIGH
Vbat Undervoltage
HIGH
H
HIGH
CRD_VCC OK
HIGH
H
LOW
CRD_VCC Undervoltage
The STATUS pin provides a feedback related to the
detection of the card, the state of the DCDC converter, the
Vbat undervoltage and CRD_VCC undervoltage situations.
When PGM = H, the STATUS pin returns a High if a card is
detected present, a Low being asserted if there is no card
inserted. In any case, the external card is not automatically
powered up. When the external MPU asserts PWR_ON = H,
together with CS = L, the CRD_VCC supply is provided to
the card and the state of the DCDC converter, the Vbat and
the CRD_VCC can be polled through the STATUS pin.
Card Power Supply Timing
At power up, the CRD_VCC power supply rise time
depends upon the current capability of the DCDC
converter associated with the external inductor L1 and the
reservoir capacitor connected across CRD_VCC and
GROUND.
On the other hand, at turn off, the CRD_VCC fall time
depends upon the external reservoir capacitor and the peak
current absorbed by the internal CMOS transistor built
across CRD_VCC and GROUND. These behaviors are
depicted in Figure 6. Since these parameters have finite
values, depending upon the external constraints, the
designer must take care of these limits if the tON or the tOFF
provided by the data sheets does not meet his requirements.
Figure 6. Card Power Supply Turn ON and OFF Timing
Typical CRD_VCC Rise Time @ Cout = 10
mF, V = 5.0 V
Typical CRD_VCC Fall Time @ Cout = 10
mF, V = 5.0 V
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