AT83C24 ATMEL Corporation, AT83C24 Datasheet - Page 5

• Manufacturer Part Number: AT83C24
• Description: Smart Card Reader Interface with Power Management
• Manufacturer: ATMEL Corporation

Table 1. Ports Description (Continued)
4234E–SCR–09/04
Pad Name
CVCCin
CVCC
DVCC
EVCC
CVSS
VSS
Power Supply
Pad Internal
Limits
Note:
ESD
8 kV+
8 kV+
3 kV+
3 kV+
8 kV+
ESD Test conditions: 3 positive and 3 negative pulses on each pin versus GND. Pulses
generated according to Mil/STD 883 Class3. Recommended capacitors soldered on
CVCC and VCC pins.
Type
Pad
PWR
PWR
PWR
PWR
GND
GND
Description
Card Supply Voltage
CVCC is the programmable voltage output for the Card interface.
It must be connected to external decoupling capacitors (see page 35 and page 36).
Card Supply Voltage
This pin must be connected to CVCC.
Digital Supply Voltage
Is internally generated and used to supply the digital core.
This pin has to be connected to an external capacitor of 100 nF and should not be
connected to other devices.
Extra Supply Voltage (Microcontroller power supply)
EVCC is used to supply the internal level shifters of host interface pins.
EVCC voltage can be supplied from the external EVCC pin connected to the host power
supply.
If EVCC cannot be connected to the host power supply, it must be tied to an external
capacitor. EVCC voltage can be generated internally by an automatic follow up of the
logic high level on the I/O pin. In this configuration, connect a 100 nF + 100kOhms in
parallel between EVCC pin and VSS pin.
DC/DC Ground
CVSS is used to sink high shunt currents from the external coil.
Ground
AT83C24
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