Overview
The ST8024LCDR, produced by STMicroelectronics, is a complete low-cost analog interface designed for asynchronous Class A, B, and C smartcards. This component can be placed between the smartcard and the microcontroller, requiring few external components to perform all necessary supply protection and control functions. It is compatible with various smartcard standards, including ISO 7816, GSM11.11, and EMV 4.2 payment systems.
Key Specifications
| Parameter | Description |
|---|---|
| Supply Voltage (VDD) | 3 V or 5 V |
| Card Supply Voltage (VCC) | 1.8 V ± 6.5%, 3 V or 5 V ± 5% |
| Card Current (ICC) | < 80 mA at VDDP = 4.75 to 6.5 V |
| Current Spikes | Handles current spikes of 40 nA up to 20 MHz |
| Rise and Fall Times | Controlled rise and fall times |
| Overload Detection | Filtered overload detection at approximately 120 mA |
| Protection | Thermal and short-circuit protection on all card contacts |
| ESD Protection | Enhanced ESD protection on card side (> 6 kV) |
| Clock Generation | Clock generation for cards up to 20 MHz (divided by 1, 2, 4 or 8) |
| Operating Temperature | -25°C to 85°C |
| Package | SO-28, TSSOP-28 |
Key Features
- Designed to be compatible with the NDS conditional access system (except ST8024LTR)
- ISO 7816, GSM11.11, and EMV 4.2 (payment systems) compatible
- IC card interface with three specifically protected half-duplex bi-directional buffered I/O lines to card contacts C4, C7, and C8
- Step-up converter for VCC generation separately powered by a 5 V ± 20% supply (VDDP and PGND)
- Automatic activation and deactivation sequences initiated by software or hardware in the event of a short-circuit, card take-off, overheating, VDD or VDDP dropout
- 26 MHz integrated crystal oscillator
- Built-in debounce on card presence contacts
- One multiplexed status signal OFF
- Non-inverted control of RST via pin RSTIN
- Supply supervisor for spike-killing during power-on and power-off and power-on reset
Applications
- Smartcard readers for set-top boxes
- IC card readers for banking and financial transactions
- Identification and security systems
- Pay TV systems
Q & A
- What is the primary function of the ST8024LCDR?
The ST8024LCDR is a complete low-cost analog interface for asynchronous Class A, B, and C smartcards, designed to be placed between the smartcard and the microcontroller.
- What are the compatible smartcard standards for the ST8024LCDR?
The ST8024LCDR is compatible with ISO 7816, GSM11.11, and EMV 4.2 payment systems.
- What is the range of the supply voltage (VDD) for the ST8024LCDR?
The supply voltage (VDD) for the ST8024LCDR can be either 3 V or 5 V.
- What is the maximum current (ICC) the ST8024LCDR can handle?
The ST8024LCDR can handle a maximum current (ICC) of less than 80 mA at VDDP = 4.75 to 6.5 V.
- Does the ST8024LCDR have ESD protection?
Yes, the ST8024LCDR has enhanced ESD protection on the card side, greater than 6 kV.
- What is the operating temperature range of the ST8024LCDR?
The operating temperature range of the ST8024LCDR is from -25°C to 85°C.
- What types of packages are available for the ST8024LCDR?
The ST8024LCDR is available in SO-28 and TSSOP-28 packages.
- Does the ST8024LCDR have built-in clock generation capabilities?
Yes, the ST8024LCDR has clock generation capabilities for cards up to 20 MHz, with divisions by 1, 2, 4, or 8.
- What kind of protection does the ST8024LCDR offer for the smartcard contacts?
The ST8024LCDR offers thermal and short-circuit protection on all card contacts.
- How does the ST8024LCDR handle card presence detection?
The ST8024LCDR has built-in debounce on card presence contacts.
