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| 型号： | 73S8023C-IMR/F |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 27/27页 |
| 文件大小： | 0K |
| 描述： | IC SMART CARD INTERFACE 32-QFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 控制器类型： | 智能卡接口 |
| 电源电压： | 2.7 V ~ 3.6 V |
| 电流 - 电源： | 4.9mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN（5x5） |
| 包装： | 带卷 (TR) |
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DS_8023C_019
73S8023C Data Sheet
Rev. 1.5
9
5
Voltage Supervision
Two voltage supervisors constantly check the presence of the voltages VDD and VCC. A card deactivation
sequence is triggered upon a fault detected by these voltage supervisors.
The digital circuitry is powered by the power supply applied on the VDD pin. VDD also defines the voltage
range for the interface with the system controller. The VDD Voltage supervisor is also used to initialize the
ISO-7816-3 sequencer at power-on, and also to deactivate the card at power-off or upon a fault. The
voltage threshold of the VDD voltage supervisor is internally set by default to 2.3 V nominal. However, it
may be desirable, in some applications, to modify this threshold value. The pin VDDF_ADJ (pin 17) 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 = 180 k
Ω /(V
DDF
An alternative (more accurate) method of adjusting the V
- 2.33)
DD
fault voltage is to use a resistive network of
R3 from the pin to supply and R1 from the pin to ground (see
). 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 = (2.649 / VTH) - 0.6042 where VTH is the desired new threshold voltage.
To determine the values of R1 and R3, use the following formulas:
R3 = 72000 / Kx
R1 = R3*(Kx / (1 – Kx))
Taking the example above, where a VDD fault threshold voltage of 2.7 V is desired, solving for Kx gives:
Kx = (2.649 / 2.7) - 0.6042 = 0.377
Solving for R3 gives:
R3 = 72000 / 0.377 = 191 k
.
Solving for R1 gives:
R1 = 191000 *(0.377 / (1 – 0.377)) = 115.6 k
.
Using standard 1 % resistor values gives R3 = 191 k
and R1 = 115 k. These values give an
equivalent resistance of Kx = 0.376, a 0.3% error.
Using 1% external resistors and a parallel resistance of 72 k ohms will result in a +/- 6% tolerance in the
value of VDD Fault. The sources of variation due to integrated circuit process variations and mismatches
include the internal reference voltage (less than +/- 1%), the internal comparator hysteresis and offset
(less than +/- 1.7% for part-to-part, processing and environment), the internal resistor value mismatch and
value variations (less than 1.8%), and the external resistor values (1%).
If the 2.3 V default threshold is acceptable, this pin must be left unconnected.
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相关代理商/技术参数 |
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|---|---|
| 73S8024C-DB | 功能描述:界面开发工具 73S8024C Demo Brd RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| 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 |
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