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| 型号： | 73S8024C-DB |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/22页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO 73S8024C 28-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 系列： | * |
DS_8024C_023
73S8024C Data Sheet
Rev. 1.3
7
4
DC-DC Converter – Card Power Supply
An internal DC-DC converter provides the card power supply. This converter is able to provide either 3 V
or 5 V card voltage from the power supply applied on the VDD pin. The digital ISO-7816-3 sequencer
controls the converter. Card voltage selection is carried out by the digital input 5V/
#V.
The circuit is an inductive step-up converter/regulator. The external components required are 2 filter
capacitors on the power-supply input VDD (next to the LIN pin, 100 nF + 10 F), an inductor, and an
output filter capacitor on the card power supply VCC. The circuit performs regulation by activating the
step-up operation when VCC is below a set point of 5.0 or 3.0 volts minus a comparator hysteresis voltage
and the input supply VDD is less than the set point for VCC. When VDD is greater than the set point for VCC
(VDD = 3.6 V, VCC =3 V) the circuit operates as a linear regulator.
Depending on the inductor values, the voltage converter can provide current on VCC as high as 100 mA.
The circuit provides over-current protection and limits ICC to 150 mA. When an over-current condition is
sensed, the circuit initiates a deactivation sequence from the control logic and reports back to the host
controller a fault on the interrupt output
OFF.
Choice of the inductor
The nominal inductor value is 10
H, rated for 400 mA. The inductor is connected between LIN (pin 5 in
the SO package, pin 2 in the QFN package) and the VDD voltage. The inductor value can be optimized to
meet a particular configuration (ICC_MAX). The inductor should be located on the PCB as close as possible
to the LIN pin of the IC.
Choice of the VCC
Depending on the applications, the requirements in terms of both the V
capacitor
CC
minimum voltage and the
transient currents that the interface must provide to the card are different.
shows the
recommended capacitors for each VCC
Table 1: Choice of VCC Pin Capacitor
power supply configuration and applicable specification.
Specification Requirement
Application
Specification
Min VCC
Max Transient
Current Charge
Voltage
Allowed During
Transient Current
Capacitor
Type
Capacitor
Value
EMV 4.0
4.6 V
30 nAs
X5R/X7R w/
ESR < 100 m
3.3
F
ISO-7816-3
4.5 V
20 nAs
1
F
Table 1: Choice of VCC Pin Capacitor
5
Over-temperature Monitor
A built-in detector monitors die temperature. When an over-temperature condition occurs, a card
deactivation sequence is initiated, and an error or fault condition is reported to the system controller.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 73S8024C-IL/F | 功能描述:I2C 接口集成电路 Smart Card Interface ISO7816-3 & EVM4.0 RoHS:否 制造商:NXP Semiconductors 电源电压-最大:5.5 V 电源电压-最小:2.3 V 最大工作频率:400 KHz 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-16 |
| 73S8024C-ILR/F | 功能描述:输入/输出控制器接口集成电路 Smart Card Interface ISO7816-3 & EVM4.0 RoHS:否 制造商:Silicon Labs 产品: 输入/输出端数量: 工作电源电压: 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-64 封装:Tray |
| 73S8024RN | 制造商:TERIDIAN 制造商全称:TERIDIAN 功能描述:Low Cost Smart Card Interface |
| 73S8024RN-20IM/F | 功能描述:输入/输出控制器接口集成电路 Smart Card Interface ISO7816-3 & EVM4.0 RoHS:否 制造商:Silicon Labs 产品: 输入/输出端数量: 工作电源电压: 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-64 封装:Tray |
| 73S8024RN-20IM/F1 | 功能描述:输入/输出控制器接口集成电路 Smart Card Interface ISO7816-3 & EVM4.0 RoHS:否 制造商:Silicon Labs 产品: 输入/输出端数量: 工作电源电压: 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-64 封装:Tray |
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