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参数资料
| 型号： | ST8024CTR |
| 厂商： | 意法半导体 |
| 英文描述： | Smartcard interface |
| 中文描述： | 智能卡接口 |
| 文件页数： | 20/30页 |
| 文件大小： | 550K |
| 代理商： | ST8024CTR |
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Functional description
ST8024
20/30
must stay below the specified maximum current value. For reasons of V
CC
voltage accuracy,
a 100 nF capacitor with an ESR < 100 m
should be tied to CGND near to pin V
CC
, and 100
nF capacitor with the same ESR should be tied to CGND near card reader contact C1.
5.10
Fault detection
The following fault conditions are monitored:
– Short-circuit or high current on V
CC
– Removal of a card during a transaction
– V
DD
dropping
– DC/DC converter operating out of the specified values (V
DDP
too low or current from
V
UP
too high)
– Overheating.
– There are two different cases (see
Figure 8.
):
– CMDVCC HIGH outside a card session. Output OFF is LOW if a card is not in the
card reader, and HIGH if a card is in the reader. A voltage drop on the V
DD
supply is
detected by the supply supervisor, this generates an internal Power-on reset pulse
but does not act upon OFF. No short-circuit or overheating is detected because the
card is not powered-up.
– CMDVCC LOW within a card session. Output OFF goes LOW when a fault condition
is detected. As soon as this occurs, an emergency deactivation is performed
automatically (see
Figure 9.
). When the system controller resets CMDVCC to HIGH it
may sense the OFF level again after completing the deactivation sequence. This
distinguishes between a hardware problem or a card extraction (OFF goes HIGH
again if a card is present).
Depending on the type of card-present switch within the connector (normally-closed or
normally-open) and on the mechanical characteristics of the switch, bouncing may occur on
the PRES signals at card insertion or withdrawal.
There is a debounce feature in the device with an 8 ms typical duration (see Fig.8). When a
card is inserted, output OFF goes HIGH only at the end of the debounce time.
When the card is extracted, an automatic deactivation sequence of the card is performed on
the first true/false transition on PRES or PRES and output OFF goes LOW.
Figure 8.
Behavior of OFF, CMDVCC, PRES and V
CC
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ST8024L | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Smartcard interface |
| ST8024LACDR | 功能描述:接口 - 专用 Smart card interface 3V or 5V 26 MHz RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59 |
| ST8024LACTR | 制造商:STMicroelectronics 功能描述: 制造商:STMicroelectronics 功能描述:Smart card interface 制造商:STMicroelectronics 功能描述:Smartcard interface |
| ST8024LCDR | 功能描述:外围驱动器与原件 - PCI ST8024 Smartcard INT 3V or 5V Supply CTRL RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
| ST8024LCTR | 功能描述:接口 - 专用 Smart card interface 3V or 5V 26 MHz RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59 |
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