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73S8024RN-IMR/F PDF预览

73S8024RN-IMR/F

更新时间： 2024-02-29 04:17:00
品牌 Logo 应用领域
美信 - MAXIM /
页数 文件大小 规格书
27页 459K
描述
Low-Cost Smart Card Interface

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73S8024RN-IMR/F 技术参数

是否无铅： 含铅是否Rohs认证： 符合
生命周期：Obsolete包装说明：QFN-32
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.57
模拟集成电路 - 其他类型：ANALOG CIRCUITJESD-30 代码：S-XQCC-N32
长度：4 mm湿度敏感等级：1
功能数量：1端子数量：32
最高工作温度：85 °C最低工作温度：-40 °C
封装主体材料：UNSPECIFIED封装代码：HVQCCN
封装形状：SQUARE封装形式：CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度（摄氏度）：NOT SPECIFIED座面最大高度：0.85 mm
最大供电电压 (Vsup)：5.5 V最小供电电压 (Vsup)：2.7 V
表面贴装：YES温度等级：INDUSTRIAL
端子形式：NO LEAD端子节距：0.5 mm
端子位置：QUAD处于峰值回流温度下的最长时间：NOT SPECIFIED
宽度：4 mmBase Number Matches：1

73S8024RN-IMR/F 数据手册

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73S8024RN Data Sheet  
DS_8024RN_020  
3 Power Supply and Voltage Supervision  
The 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= 56kΩ /(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:  
Solving for R1 gives:  
R3 = 24000 / 0.42046 = 57080.  
R1 = 57080 *(0.42046 / (1 – 0.42046)) = 41412.  
Using standard 1 % resistor values gives R3 = 57.6KΩ and R1 = 42.4KΩ.  
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 20QFN package has the VDD  
fault threshold fixed at this default value.  
8
Rev. 2  
 
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