參數(shù)資料
型號(hào)： 73S8024RN-32IM
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, QCC32
封裝： QFN-32
文件頁(yè)數(shù)： 19/23頁(yè)
文件大小： 318K
代理商： 73S8024RN-32IM
73S8024RN
Low Cost Smart Card Interface
DATA SHEET
Page: 5 of 23
2005 TERIDIAN Semiconductor Corporation
Rev 1.5
POWER SUPPLY AND VOLTAGE SUPERVISON
The TERIDIAN 73S8024RN smart card interface IC incorporates a LDO voltage regulator. The voltage output is
controlled by the digital input 5V/
#V. This regulator is able to provide either 3V or 5V card voltage from the power
supply applied on the VPC pin.
Digital circuitry is powered by the power supply applied on the VDD pin. VDD also defines the voltage range to
interface with the system controller.
Three voltage supervisors constantly check the presence of the voltages VDD, VPC and VCC. A card deactivation
sequence is forced upon fault of any of these voltage supervisors. The two voltage supervisors for VPC and VCC
are linked so that a fault is generated to activate a deactivation sequence when the voltage VPC becomes lower
than VCC. It allows the 73S8024RN to operate at lower VPC voltage when using 3V cards only. The voltage
regulator can provide a current of at least 90mA on VCC that comply easily with EMV 4.0 and NDS specifications.
The VPC voltage supervisor threshold values are defined from applicable standards (EMV and NDS). A third
voltage supervisor monitors the VDD voltage. It is used to initialize the ISO-7816-3 sequencer at power-on, and to
deactivate the card at power-off or upon fault. The voltage threshold of the VDD voltage supervisor is internally set
by default to 2.3V nominal. However, it may be desirable, in some applications, to modify this threshold value.
The pin VDDF_ADJ (pin 18 in the SO package, pin 17 in the 32QFN package, not supported in the 20QFN
package) is used to connect an external resistor REXT to ground to raise the VDD fault voltage to another value
VDDF. The resistor value is defined as follows:
REXT= 56k /(VDDF - 2.33)
An alternative method (more accurate) of adjusting the VDD fault voltage is to use a resistive network of R3 from
the pin to supply and R1 from the pin to ground (see applications diagram). In order to set the new threshold
voltage, the equivalent resistance must be determined. This resistance value will be designated Kx. Kx is
defined as R1/(R1+R3). Kx is calculated as:
Kx = (2.789 / VTH) - 0.6125 where VTH is the desired new threshold voltage.
To determine the values of R1 and R3, use the following formulas.
R3 = 24000 / Kx
R1 = R3*(Kx / (1 – Kx))
Taking the example above, where a VDD fault threshold voltage of 2.7V is desired, solving for Kx gives:
Kx = (2.789 / 2.7) - 0.6125 = 0.42046.
Solving for R3 gives:
R3 = 24000 / 0.42046 = 57080.
Solving for R1 gives:
R1 = 57080 *(0.42046 / (1 – 0.42046)) = 41412.
Using standard 1 % resistor values gives R3 = 57.6K
and R1 = 42.4K.
These values give an equivalent resistance of Kx = 0.4228, a 0.6% error.
If the 2.3V default threshold is used, this pin must be left unconnected. The 20 QFN package has the VDD fault
threshold fixed at this default value.
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PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
73S8024RN-32IM/F 功能描述:IC SMART CARD INTERFACE 32-QFN RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 控制器 系列:- 標(biāo)準(zhǔn)包裝:4,900 系列:- 控制器類(lèi)型:USB 2.0 控制器 接口:串行 電源電壓:3 V ~ 3.6 V 電流 - 電源:135mA 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:36-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:36-QFN（6x6） 包裝:* 其它名稱(chēng):Q6396337A
73S8024RN-32IMR/F 功能描述:IC SMART CARD INTERFACE 32-QFN RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 控制器 系列:- 標(biāo)準(zhǔn)包裝:4,900 系列:- 控制器類(lèi)型:USB 2.0 控制器 接口:串行 電源電壓:3 V ~ 3.6 V 電流 - 電源:135mA 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:36-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:36-QFN（6x6） 包裝:* 其它名稱(chēng):Q6396337A
73S8024RN-DB 功能描述:界面開(kāi)發(fā)工具 73S8024RN Demo Brd RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類(lèi)型:RS-485 工具用于評(píng)估:ADM3485E 接口類(lèi)型:RS-485 工作電源電壓:3.3 V
73S8024RN-IL 制造商:TERIDIAN 功能描述: 制造商:TDK 功能描述:SPECIALTY ANALOG CIRCUIT, 28 Pin Plastic SMT
73S8024RN-IL/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(chǎn)品: 輸入/輸出端數(shù)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray
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