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參數資料
| 型號： | 73S8024C-ILR/F |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| 封裝： | LEAD FREE, SOP-28 |
| 文件頁數： | 20/22頁 |
| 文件大小： | 471K |
| 代理商： | 73S8024C-ILR/F |
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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相關代理商/技術參數 |
參數描述 |
|---|---|
| 73S8024RN | 制造商:TERIDIAN 制造商全稱:TERIDIAN 功能描述:Low Cost Smart Card Interface |
| 73S8024RN-20IM/F | 功能描述:輸入/輸出控制器接口集成電路 Smart Card Interface ISO7816-3 & EVM4.0 RoHS:否 制造商:Silicon Labs 產品: 輸入/輸出端數量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
| 73S8024RN-20IM/F1 | 功能描述:輸入/輸出控制器接口集成電路 Smart Card Interface ISO7816-3 & EVM4.0 RoHS:否 制造商:Silicon Labs 產品: 輸入/輸出端數量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
| 73S8024RN-20IMR/F | 功能描述:輸入/輸出控制器接口集成電路 Smart Card Interface ISO7816-3 & EVM4.0 RoHS:否 制造商:Silicon Labs 產品: 輸入/輸出端數量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
| 73S8024RN-20IMR/F1 | 功能描述:輸入/輸出控制器接口集成電路 Smart Card Interface ISO7816-3 & EVM4.0 RoHS:否 制造商:Silicon Labs 產品: 輸入/輸出端數量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
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