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Microchip Technology AT83C24B-PRRUM
- Part No.:
- AT83C24B-PRRUM
- Manufacturer:
- Microchip Technology
- Category:
- Specialized
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
AT83C24B-PRRUM.pdf
- Description:
- IC INTERFACE SPECIALIZED 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,211
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Product details
Overview
AT83C24B-PRRUM from Microchip Technology is a smart card reader interface IC with integrated DC/DC converter, supporting ISO 7816, EMV2000, and GSM standards. It delivers programmable card supply voltages (5V ±5%, 3V ±0.2V, 1.8V ±0.14V), features 8 kV+ ESD protection on CIO/CC4/CC8 pins, and operates from 4–48 MHz clock input. It is used in EFT/POS terminals and set-top boxes for secure card power management and TWI-controlled activation.
For engineers reviewing the AT83C24B-PRRUM datasheet, AT83C24B-PRRUM pinout, AT83C24B-PRRUM application, or AT83C24B-PRRUM equivalent, key selection considerations include its dual-mode power architecture (step-up or regulator), TWI-addressable multi-device configuration (up to 8 units), hardware/software activation flexibility, and industrial temperature support (−40°C to +85°C).
Technical Context
The AT83C24B-PRRUM implements a two-wire interface (TWI) controller supporting up to 400 kbit/s, with programmable slave address via A2/CK, A1/RST, and A0/3V pins. Its clock controller supports four CCLK sources (CLK, DCCLK, CARDCK, A2/CK) and includes automatic reset transition (ART) logic for precise ATR timing compliance.
It integrates a high-efficiency (80–98%) step-up DC/DC converter with CVCC output, voltage supervisor (POR/PFD), and configurable card presence detection (CPRES) with programmable filtering and pull-up control. The device supports both transparent mode (direct ISO 7816 signal pass-through) and full software-controlled activation/deactivation sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3V to 5.5V VCC input enables single-rail operation across portable and fixed systems. |
| Card Supply Outputs | Programmable CVCC: 5V ±5% (Class A), 3V ±0.2V (Class B), or 1.8V ±0.14V - matches ISO 7816 voltage classes without external regulators. |
| Efficiency | 80–98% DC/DC conversion efficiency reduces thermal load and extends battery life in portable readers. |
| ESD Protection | 8 kV+ HBM on CIO/CC4/CC8 pins ensures robustness against handling and insertion stress in field-deployed terminals. |
| Operating Temperature | −40°C to +85°C industrial range supports deployment in uncontrolled environments like retail kiosks and cable headends. |
| Power-down Current | 30 µA typical (no card attached) minimizes standby drain in always-on smart card infrastructure. |
| Max In-rush Current | 180 mA limits peak demand during cold start, easing capacitor and PCB trace design. |
Pinout & Package
AT83C24B-PRRUM is available in SO28 and QFN28 packages. Both variants share identical pin functions and electrical characteristics per Atmel/Microchip datasheet 4234G–SCR–01/07.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A2/CK, A1/RST, A0/3V | TWI Address Inputs / Mode Select | Set 3-bit slave address at reset; A0/3V also selects CVCC voltage (High = 5V, Low = 3V). |
| PRES/INT | Open-drain Interrupt Output | Configurable as card presence or event interrupt (over-current, VCARDERR, ATR timeout) via IT_SEL bit. |
| CIO, CC4, CC8 | Smart Card I/O Interface | Bi-directional, ESD-hardened (8 kV+) connections to card contacts; level-shifted to CVCC domain. |
| CRST, CCLK | Card Reset & Clock Outputs | Driven by internal logic or transparently from A1/RST/A2/CK; support ART-controlled reset timing per ISO 7816. |
| CPRES | Card Presence Input | Programmable polarity and filtering (CDS[2:0]) enable reliable detection across mechanical connector variations. |
| CVCC, CVCCin | Card Power Supply | CVCC provides regulated output to card; CVCCin is dedicated return path for low-noise decoupling (≤200 mV ripple). |
| LI | DC/DC Inductor Connection | Connects external 4.7 µH coil; enables step-up operation when VCC < required CVCC (e.g., 3V → 5V). |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7816 Compliance | Fully implements Class A/B/C voltage modes, ATR timing windows (ta/tb/tc), and card deactivation sequencing per standard. |
| Multi-device TWI Bus | Supports up to 8 AT83C24B-PRRUM devices on one bus using hardware-configurable A2/A1/A0 addressing. |
| Automatic Reset Transition (ART) | Hardware timer synchronizes CRST edge to card clock cycles, enabling precise tb/tc timing without host CPU intervention. |
| Flexible Activation Modes | Hardware (CMDVCC-triggered) and software (TWI-register-driven) activation paths simplify integration across host MCU architectures. |
| Integrated Power Monitoring | POR and PFD detect VCC faults and trigger controlled card deactivation, preventing data corruption during brownout. |
Applications
| EFT/POS Terminal | Set-Top Box (STB) |
|---|---|
Use Scenario: Secure payment processing in retail point-of-sale systems requiring EMV2000-compliant card reading. IC Role / Device Role / Timing Role: Smart card interface controller managing card power, clock, reset, and I/O with real-time TWI register access. Use Value: Eliminates discrete DC/DC and level-shifter components while ensuring 8 kV ESD resilience and low 30 µA standby current for battery-backed designs. | Use Scenario: Conditional access module in digital TV receivers using NDS VideoGuard software. IC Role / Device Role / Timing Role: Dedicated smart card interface with ART-timed reset for secure key loading and session establishment. Use Value: Meets NDS-specific requirements including 18 MHz min clock, 3.3 µF CVCC capacitor, and IT_SEL=1 interrupt behavior. |
| Government ID Reader | Secure Access Control System |
Use Scenario: National eID card authentication in border control or citizen service kiosks compliant with ICAO PKI standards. IC Role / Device Role / Timing Role: ISO 7816-compliant interface supporting synchronous cards (C4/C8 contacts) and GIE-CB protocol extensions. Use Value: Enables direct connection to contact-based ID cards with programmable voltage selection and built-in card presence detection. | Use Scenario: Physical access credential verification in enterprise buildings using PKI-enabled smart cards. IC Role / Device Role / Timing Role: Embedded card interface providing secure power sequencing, tamper-resistant reset control, and low-noise CVCC (<200 mV ripple). Use Value: Reduces BOM count and improves reliability over discrete solutions while maintaining WHQL and EMV2000 certification paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar smart card interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SLB9670 | Trusted Platform Module (TPM) with integrated secure processor; no native smart card interface or DC/DC converter. | Designed for PC platform root-of-trust, not card reader peripheral interfacing. | Select only if system requires TPM functionality alongside card interface - requires external interface IC. |
| SC16IS752 | UART-to-TWI bridge IC; lacks card power management, CVCC regulation, ISO 7816 timing control, and ESD hardening. | Used for serial peripheral expansion, not smart card reader subsystems. | Not suitable as functional replacement; consider only for non-card-specific TWI expansion needs. |
Compared with SLB9670 and SC16IS752, the AT83C24B-PRRUM uniquely integrates ISO 7816-compliant card power, clock, reset, and I/O control with 8 kV ESD protection and multi-device TWI addressing - eliminating need for supplemental power ICs or protocol translators in reader designs.
Availability
AT83C24B-PRRUM is available at Aetrix Electronics and suitable for EFT/POS terminals, set-top boxes, and government ID readers requiring stable component supply, long-term lifecycle support, and industrial-grade reliability.
Supply support for AT83C24B-PRRUM includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and security ICs, with broad industrial and automotive qualification coverage.
The AT83C24B-PRRUM belongs to Microchip's smart card interface product line, designed specifically for secure, low-power, standards-compliant smart card reader/writer applications in financial, broadcast, and identity markets.
FAQ
What is the minimum clock frequency required for AT83C24B-PRRUM operation?
The AT83C24B-PRRUM requires a minimum 4 MHz clock input for basic operation, but the step-up converter mandates ≥7 MHz. For NDS-compliant configurations (e.g., AT83C24NDS), the minimum is 18 MHz. Always verify clock source stability and jitter per Section 4.2 of the 4234G–SCR–01/07 datasheet when designing with AT83C24B-PRRUM.
Does AT83C24B-PRRUM support 1.8V smart cards?
Yes, AT83C24B-PRRUM supports 1.8V smart cards with ±0.14V tolerance at up to 40 mA. This is configured via VCARD[1:0] bits in CONFIG0 register and requires corresponding ATR-handling firmware. The 1.8V mode is fully compliant with ISO 7816-3 Annex A and validated in Microchip's reference designs for AT83C24B-PRRUM.
How does the AT83C24B-PRRUM handle card presence detection?
AT83C24B-PRRUM uses the CPRES pin with programmable polarity (CARDDET bit) and 3-bit filtering (CDS[2:0]) to reject mechanical bounce. An internal pull-up can be enabled/disabled via PULLUP bit, and interrupts are generated on insertion/extraction when INSERT bit is set. This logic is independent of card voltage mode and active in all power states except shutdown.
Can multiple AT83C24B-PRRUM devices share the same TWI bus?
Yes, up to eight AT83C24B-PRRUM devices can operate on a single TWI bus using unique 3-bit hardware addresses set by A2/CK, A1/RST, and A0/3V pins at reset. Address byte values range from 0x40/0x41 to 0x4E/0x4F for write/read operations, as defined in Table 2 of the AT83C24B-PRRUM datasheet.
What is the purpose of the LI pin on AT83C24B-PRRUM?
The LI pin connects the external inductor (typically 4.7 µH) for the internal step-up DC/DC converter. When VCC is below the required CVCC (e.g., 3V system powering a 5V card), LI enables efficient voltage boosting. If step-up is unused, LI must be tied directly to VCC - never left floating - as specified in Section 5.1 of the AT83C24B-PRRUM datasheet.
AT83C24B-PRRUM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- -
- Interface:
- 2-Wire
- Voltage - Supply:
- 3V ~ 5.5V
- Supplier Device Package:
- 28-QFN (5x5)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
AT83C24B-PRRUM FAQ
1.How can I place an order for AT83C24B-PRRUM through Aetrix?
Please submit a Request for Quotation (RFQ) for AT83C24B-PRRUM on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AT83C24B-PRRUM reliable?
The price and inventory of AT83C24B-PRRUM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT83C24B-PRRUM is usually 5 days.
3.What payment methods are accepted for AT83C24B-PRRUM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT83C24B-PRRUM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT83C24B-PRRUM?
AT83C24B-PRRUM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT83C24B-PRRUM order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AT83C24B-PRRUM?
For technical support, including AT83C24B-PRRUM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT83C24B-PRRUM requirements.
6.How does Aetrix verify that AT83C24B-PRRUM is sourced from the original manufacturer or authorized distributors?
All AT83C24B-PRRUM products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT83C24B-PRRUM meets industry standards.
7.What is the process for return or replacement of AT83C24B-PRRUM?
All AT83C24B-PRRUM units undergo pre-shipment inspection (PSI). If there is an issue with AT83C24B-PRRUM, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AT83C24B-PRRUM part is unused and in its original packaging.
Return procedure for AT83C24B-PRRUM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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