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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： | 14/30页 |
| 文件大小： | 550K |
| 代理商： | ST8024CTR |
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Functional description
ST8024
14/30
5
Functional description
Throughout this document it is assumed that the reader is familiar with ISO7816
terminology.
5.1
Power supply
The supply pins for the IC are V
DD
and GND. V
DD
should be in the range of 2.7 to 6.5 V. All
signals interfacing with the system controller are referred to V
DD
, therefore V
DD
should also
supply the system controller. All card reader contacts remain inactive during power-on or
power-off.
The internal circuits are maintained in the reset state until V
DD
reaches V
th2
+V
hys2
and for
the duration of the internal Power-on reset pulse, t
W
(see
Figure 4.
). When V
DD
falls below
V
th2
, an automatic deactivation of the contacts is performed.
A DC/DC converter is incorporated to generate the 5 or 3 V card supply voltage (V
CC
). The
DC/DC converter should be supplied separately by V
DDP
and PGND. Due to the possibility
of large transient currents, the two 100 nF capacitors of the DC/DC converter should be
located as near as possible to the IC and have an ESR less than 100 m
.
The DC/DC converter functions as a voltage doubler or a voltage follower according to the
respective values of V
CC
and V
DDP
(both have thresholds with a hysteresis of 100 mV).
The DC/DC converter function changes as follows:
V
CC
= 5 V and V
DDP
> 5.8 V; voltage follower
V
CC
= 5 V and V
DDP
< 5.7 V; voltage doubler
V
CC
= 3 V and V
DDP
> 4.1 V; voltage follower
V
CC
= 3 V and V
DDP
< 4.0 V; voltage doubler.
Supply voltages V
DD
and V
DDP
may be applied to the IC in any sequence.
After powering the device, OFF remains LOW until CMDVCC is set HIGH.
During power off, OFF falls LOW when V
DD
is below the falling threshold voltage.
5.2
Voltage supervisor
5.2.1
Without external divider on pin PORADJ
The voltage supervisor surveys the V
DD
supply. A defined reset pulse of approximately 8ms
(t
W
) is used internally to keep the IC inactive during power-on or power-off of the V
DD
supply
(see
Figure 4.
).
As long as V
DD
is less than V
th2
+ V
hys2
, the IC remains inactive whatever the levels on the
command lines. This state also lasts for the duration of t
W
after V
DD
has reached a level
higher than V
th2
+ V
hys2
. When V
DD
falls below V
th2
, a deactivation sequence of the
contacts is performed.
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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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