AT89C5122 ATMEL [ATMEL Corporation], AT89C5122 Datasheet - Page 16

• Manufacturer Part Number: AT89C5122
• Description: MICROCONTROLLER WITH USB AND SMART CARD READER INTERFACES
• Manufacturer: ATMEL [ATMEL Corporation]

Table 2. Pin Description (Continued)
16
CVCC
DVCC
PSEN
AVCC
CVSS
AVSS
Port
PLLF
VCC
VSS
LI
15
54
55
20
18
17
19
16
53
1
AT8xC5122/23
26
27
12
10
25
11
9
1
8
-
24
67
68
31
29
28
10
30
25
66
27
28
15
13
12
14
26
11
5
-
15
54
55
20
18
17
19
16
53
1
26
27
12
10
25
11
9
1
8
-
Internal
Supply
Power
AVCC
VCC
ESD
PWR
PWR
PWR
PWR
PWR
GND
GND
GND
I/O
O
O
Reset
Level
Program Strobe Enable: The read strobe to external program
memory. When executing code from the external program memory,
PSEN is activated twice each machine cycle, except that two PSEN
activations are skipped during each access to external data memory.
PSEN is not activated during fetches from internal program memory.
PLL Low Pass Filter input
Receives the RC network of the PLL low pass filter.
Analog Supply Voltage
AVCC is used to supply the internal 3.3V analog regulator which
supplies the internal USB driver
Supply Voltage
VCC is used to supply the internal 3.3V digital regulator which
supplies the PLL, CPU core and internal I/O’s
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.
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
Digital Supply Voltage
DVCC is the output of the internal analog 3.3V regulator which
supplies the USB driver. This pin must be connected to an external
680nF decoupling capacitor if the USB interface is used.
This output can be used by the application with a maximum of 10 mA.
DC/DC Ground
CVSS is used to sink high shunt currents from the external coil
Digital Ground
VSS is used to supply the PLL, buffer ring and the digital core
Analog Ground
AVSS is used to supply the USB driver.
Alt
Config
Reset
Conf 1
Conf 2
Conf 3
4202D–SCR–06/05
Led