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AT83C24NDS-TIRIL Datasheet(PDF) 4 Page - ATMEL Corporation |
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AT83C24NDS-TIRIL Datasheet(HTML) 4 Page - ATMEL Corporation |
4 / 42 page 4 4234F–SCR–10/05 AT83C24 SDA VCC 3 kV I/O open- drain Microcontroller Interface Function TWI serial data SCL VCC 3 kV I/O open- drain Microcontroller Interface Function TWI serial clock I/O EVCC 3 kV I/O Microcontroller Interface Function Copy of CIO pin and high level reference for EVCC. An external pull up to EVCC is needed on IO pin. I/O is the reference level for EVCC if EVCC is connected to a capacitor. This feature is unused if EVCC is connected to VCC. C4 EVCC 3 kV I/O (pull-up) Microcontroller Interface Function Copy of Card CC4. C8 EVCC 3 kV I/O (pull-up) Microcontroller Interface Function Copy of Card CC8. CLK EVCC 3 kV I Microcontroller Interface Function Master Clock CIO CVCC 8 kV+ I/O (pull-up) Smart card interface function Card I/O CC4 CVCC 8 kV+ I/O (pull-up) Smart card interface function Card C4 CC8 CVCC 8 kV+ I/O (pull-up) Smart card interface function Card C8 CPRES VCC 8 kV+ I (pull-up) Smart card interface function Card presence An internal Pull-up to VCC can be activated in the pad if necessary using PULLUP bit (CONFIG1 register). CCLK CVCC 8 kV+ O Smart card interface function Card clock CRST CVCC 8 kV+ O Smart card interface function Card reset CMDVCC EVCC 3 kV+ I (pull-up) Microcontroller Interface Function: Activation/Shutdown of the smart card Interface. VCC 3 kV+ PWR Supply Voltage V CC is used to power the internal voltage regulators and I/O buffers. LI 3 kV+ PWR DC/DC Input LI must be tied to VCC pin through an external coil (typically 4.7 μH) and provides the current for the charge pump of the DC/DC converter. It may be directly connected to VCC if the step-up converter is not used (see STEPREG bit in CONFIG4 register and see minimum VCC values in Table 20 (class A) and Table 21 (class B)). Table 1. Ports Description (Continued) Pad Name Pad Internal Power Supply ESD Limits Pad Type Description |
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