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AT83C23OK Datasheet(PDF) 5 Page - ATMEL Corporation |
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AT83C23OK Datasheet(HTML) 5 Page - ATMEL Corporation |
5 / 17 page 5 AT83C23OK 4307CS–SCR–03/07 RST 16 16 VCC I/0 Reset Input The Port pins are driven to their reset conditions when a voltage lower than VIL is applied, whether or not the oscillator is running. This pin has an internal 10K pull-up resistor which allows the device to be reset by connecting a capacitor between this pin and VSS. Asserting RST when the chip is in Idle mode or Power-Down mode returns the chip to normal operation. The output is active for at least 12 oscillator periods when an internal reset occurs. D+ 29 29 DVCC I/O For Serial reader: Connect this pin to GND. For USB reader: USB Positive Data Upstream Port This pin requires an external serial resistor of 27 Ω (AT8xC122) or 33Ω (AT83C5123) and a 1.5 K Ω pull-up to VREF for full speed configuration. D- 28 28 DVCC I/O For Serial reader: Connect this pin to GND. For USB reader: USB Negative Data Upstream Port This pin requires an external serial resistor of 27 Ω (AT8xC122) or 33Ω (AT83C5123) VREF 30 30 AVCC O For Serial reader: Leave this pin unconnected. For USB reader: USB Voltage Reference: 3.0 < VREF < 3.6 V VREF can be connected to D+ through a 1.5 KΩ resistor. The VREF voltage is controlled by software. XTAL1 14 14 VCC I Input to the on-chip inverting oscillator amplifier To use the internal oscillator, a crystal or an external oscillator must be connected to this pin. XTAL2 15 15 VCC O Output of the on-chip inverting oscillator amplifier To use the internal oscillator, a crystal circuit must be connected to this pin. If an external oscillator is used, leave XTAL2 unconnected. PLLF 26 26 AVCC O PLL Low Pass Filter input Receives the RC network of the PLL low pass filter. AVCC 27 27 PWR Analog Supply Voltage AVCC is used to supply the internal 3.3V analog regulator which supplies the internal USB driver VCC 12 12 PWR Supply Voltage VCC is used to supply the internal 3.3V digital regulator which supplies the PLL, CPU core and internal I/O’s LI 10 10 PWR DC/DC Input LI supplies the current for the charge pump of the DC/DC converter. - LI tied directly to VCC : the DC/DC converter must be configured in regulator mode. - LI tied to VCC through an external 10µH coil : the DC/DC converter can be configured either in regulator or in pump mode. CVCC 9 9 PWR Card Supply Voltage CVCC is the ouput of internal DC/DC converter which supplies the Smart Card Interface. It must be connected to an external decoupling capacitor of 10 µF with the lowest ESR as this parameter influences on the CVCC noise Table 1. Pin Description (Continued) Port Internal Power Supply ESD I/O Reset Level Alt |
Similar Part No. - AT83C23OK_07 |
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Similar Description - AT83C23OK_07 |
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