Overview
The ST8024CDR, produced by STMicroelectronics, is a complete low-cost analog interface designed for asynchronous 3 V and 5 V smart cards. It serves as an intermediary between the smart card and the microcontroller, requiring few external components to perform all necessary supply protection and control functions. The ST8024CDR is a direct replacement for the ST8004 and is compatible with various standards including ISO 7816, GSM11.11, and EMV (payment systems).
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Supply Voltage (VDD) | 2.7 | - | 6.5 | V |
| Supply Voltage for Voltage Doubler (VDDP) | 4.0 | - | 6.5 | V |
| Supply Current (IDD) | - | 1.2 | 1.5 | mA |
| DC-DC Converter Supply Current (IDDP) | - | 0.1 | 10 | mA |
| Card Supply Voltage (VCC) | 3.0 | - | 6.5 | V |
| Operating Temperature Range | -25 | - | 85 | °C |
| Package | - | - | SO-28, TSSOP28 | - |
Key Features
- Designed to be compatible with the NDS conditional access system
- IC card interface with 3 or 5 V supply for the IC (VDD and GND)
- Three specifically protected half-duplex bi-directional buffered I/O lines to card contacts C4, C7, and C8
- DC-DC converter for VCC generation separately powered from a 5 V ± 20% supply (VDDP and PGND)
- 3 or 5 V ± 5% regulated card supply voltage (VCC) with appropriate decoupling
- Thermal and short-circuit protection on all card contacts
- Automatic activation and deactivation sequences initiated by software or hardware
- Enhanced ESD protection on card side (> 6 kV)
- 26 MHz integrated crystal oscillator
- Clock generation for cards up to 20 MHz with synchronous frequency changes
- Non-inverted control of RST via pin RSTIN
- ISO 7816, GSM11.11, and EMV (payment systems) compatibility
- Supply supervisor for spike-killing during power-on and power-off and power-on reset
- Built-in debounce on card presence contacts
- One multiplexed status signal off
Applications
The ST8024CDR is primarily used in various smart card reader applications, including:
- Smartcard readers for set-top boxes
- IC card readers for banking and financial transactions
- Identification and authentication systems
- Pay TV systems
Q & A
- What is the primary function of the ST8024CDR?
The ST8024CDR is a complete low-cost analog interface for asynchronous 3 V and 5 V smart cards, designed to be placed between the card and the microcontroller to perform all supply protection and control functions.
- What are the compatible voltage levels for the ST8024CDR?
The ST8024CDR supports both 3 V and 5 V supply voltages for the IC (VDD and GND).
- What kind of protection does the ST8024CDR offer?
The ST8024CDR offers thermal and short-circuit protection on all card contacts, as well as enhanced ESD protection on the card side (> 6 kV).
- How does the ST8024CDR manage clock generation?
The ST8024CDR includes a 26 MHz integrated crystal oscillator and can generate clock frequencies for cards up to 20 MHz, with synchronous frequency changes controlled by CLKDIV1 and CLKDIV2 signals.
- Is the ST8024CDR compatible with industry standards?
- What is the purpose of the DC-DC converter in the ST8024CDR?
The DC-DC converter generates the VCC supply voltage for the card, separately powered from a 5 V ± 20% supply (VDDP and PGND).
- How does the ST8024CDR handle card presence detection?
The ST8024CDR includes built-in debounce on card presence contacts and uses PRES and PRES inputs to detect card presence.
- What are the typical applications of the ST8024CDR?
The ST8024CDR is used in smartcard readers for set-top boxes, IC card readers for banking, identification systems, and pay TV systems.
- What are the available packages for the ST8024CDR?
The ST8024CDR is available in SO-28 and TSSOP28 packages.
- What is the operating temperature range of the ST8024CDR?
The operating temperature range of the ST8024CDR is from -25°C to 85°C.
