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AT89STK-09 Datasheet(PDF) 5 Page - ATMEL Corporation |
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AT89STK-09 Datasheet(HTML) 5 Page - ATMEL Corporation |
5 / 16 page AT89STK-09 User Guide 2-4 7521B–SCR–10/05 Section 2 Hardware The AT89STK09 requires power supply, clock signal , smart card and TWI commands to run. U1 connector is used to connect the AT83C26 host pins to the host microcontrol- ler. The U1 connector pins are described on Table 2-1. All passive components needed (inductors, capacitors) are soldered on board. 2.1 Power Supply The host microcontroller signals voltage and the AT83C26 power supply are VCC. The voltage range (VCC) is 3V to 5.5V, the maximum current consumption IVcc is about 250mA when all DC/DC convertors and LDO are activated. (Conditions : Vcc = 3V 60mA DC/DCa, 70mA DC/DCb). 2.2 Jumper Configuration The AT83C26 board has one jumper in order to set complete SC2 configuration. The complete SC2 configuration (Smart Card including CC4 & CC8) is done by SW1 solder pad. 2.3 Host Microcontroller Connection The host microcontroller must provide the signals: • VCC, VSS : Power supply signals - 3 - 5.5V @ 250mA • EVCC can be used when the Vcc host and Vcc are different. Generally the EVCC is connected to VCC. • BYPASS is used to activate the low power consumption when connected to the host microcontroller (high level must be supplied) - Generally the BYPASS is connected to the ground. • A2, A1 : TWI address - Generally A2 = 0 and A1 = 0 during Reset • SDA, SCL : TWI signals to transmit/receive commands/status Caution : TWI pull-ups have to be on the host microcontroller board • CLK signal is connected to host clock signal Caution : The logic inverter (HC04 or other) is recommended if source clock is supplied by output crystal oscillator buffer. •INT (Interrupt) : This signal must be connected to host interrupt input • CRST signal is connected to RST host microcontroller signal • CCLK signal is connected to the host smart card interface signal |
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