Low-power single-card reader IC integrates an 80C51-compatible controller with 16 kB ROM, 256 bytes of RAM, and 512 bytes of XRAM. The device supports ISO 7816 smart-card communication through a dedicated UART with T=0 and T=1 protocol support. It generates 5 V, 3 V, and 1.8 V card supplies with controlled rise and fall times and includes a DC-to-DC converter for 2.7 V to 6 V operation. Card clock generation supports up to 20 MHz, and card contacts include current limiting and enhanced ESD protection. The operating ambient temperature range is -40 °C to 90 °C.
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| Product function | Low power single card reader |
| Controller core | 80C51 |
| ROM memory | 16kB |
| RAM memory | 256byte |
| XRAM memory | 512byte |
| Host interface | Full-duplex serial link with programmable baud rates |
| Card interface UART | ISO 7816 UART for T=0 and T=1 protocols |
| ETU counter width | 24bit |
| Supply voltage | 2.7 to 6.0V |
| DC-to-DC converter input voltage | VDD to 6.0V |
| Supported card supply voltages | 5, 3, 1.8V |
| Maximum 5 V card supply current | 65mA |
| Maximum 3 V card supply current | 50 to 65mA |
| Maximum 1.8 V card supply current | 30mA |
| Overload detection current | 100 typmA |
| Card clock frequency | Up to 20MHz |
| Crystal frequency at 5 V supply | 4 to 27MHz |
| Crystal frequency below 3 V supply | 4 to 16MHz |
| Operating ambient temperature | -40 to 90°C |
| Card contact ESD protection | 6 minimumkV |
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