This document introduces the ST7GEME4 MCU chip, which is mainly used for smart card reading applications. The chip has features such as low voltage reset, halt power saving mode, PLL for generating 48 MHz USB clock, USB 2.0 compliant, CCID V1.0, full speed, hubless, bus-powered, and low consumption.
The ST7GEME4 is an 8-bit microcontroller designed specifically for smartcard reading applications. It operates at a 4 MHz external oscillator frequency and is factory-programmed with Gemplus software to manage communication protocols between smartcards and a host system. The device integrates a full-speed USB interface, an ISO 7816-3 UART interface, and a dedicated smartcard supply block capable of providing 1.8 V, 3 V, or 5 V to the card.
| Program memory | 16K ROM |
|---|---|
| User RAM | 512 bytes |
| Operating Supply | 4.0 to 5.5 V |
| CPU Frequency | 4 or 8 MHz |
| Operating temperature | 0 to +70 °C |
| Smartcard Voltage | 1.8 V, 3 V, and 5 V |
The reader is able to communicate with smartcards up to 344 086 bps for a clock frequency of 4 MHz.
No, it is a factory-programmed ROM device and is not reprogrammable.
The device requires only two external components for the internal step-up converter if 5V is supplied to smartcards.