AT83C24NDS-PRRUM ATMEL [ATMEL Corporation], AT83C24NDS-PRRUM Datasheet - Page 3

• Manufacturer Part Number: AT83C24NDS-PRRUM
• Description: Smart Card Reader Interface with Power Management
• Manufacturer: ATMEL [ATMEL Corporation]

Pin Description
Pinouts (Top View)
Signals
Table 1. Ports Description
4234F–SCR–10/05
Pad Name
PRES/INT
A1/RST-
RESET
A2/CK-
A0/3V
Power Supply
Pad Internal
EVCC
EVCC
VCC
Note:
Limits
1. NC = Not Connected
2. SOIC and QFN packages are available for
ESD
CMDVCC
3 kV
3 kV
3 kV
CVCCin
RESET
DVCC
CVSS
CVCC
CCLK
VCC
CRST
VSS
CC4
NC
C8
28-pin SOIC Pinout
LI
Type
open-
open-
14
Pad
drain
drain
4
10
11
12
1
2
3
5
6
7
8
13
9
I/O
O
I
Description
Microcontroller Interface Function:
TWI bus slave address selection input.
A2/CK and A1/RST pins are respectively connected to CCLK and CRST signals in
“transparent mode” (see page 17 ).
A0/3V is used for hardware activation to select CVCC voltage (3V or 5V).
The slave address of the device is based on the value present on A2, A1, A0 on the
rising edge of RESET pin (see Table 2). In fact, the address is taken internally at the 11th
CLK rising edge.
Microcontroller Interface Function:
Depending on IT_SEL value (see CONFIG4 register),
PRES/INT outputs card presence status or interruptions (page 9)
An internal Pull-up (typ 330kΩ,see Table 18)to EVCC can be activated in the pad if
necessary using INT_PULLUP bit (CONFIG4 register).
Remark: during power up and before registers configuration, the PRES/INT signal must
be ignored.
Microcontroller Interface Function:
•
•
•
•
Power-on reset
A low level on this pin keeps the AT83C24 under reset even if applied on power-on.
It also resets the AT83C24 if applied when the AT83C24 is running (see Power
monitoring §).
Asserting RESET when the chip is in Shut-down mode returns the chip to normal
operation.
AT83C24 is driving the Reset pin Low on power-on-reset or if power fail on V
DVCC (see POWERMON bit in CONFIG4 register), this can be used to reset or
interrupt other devices. After reset, AT83C24 needs to be reconfigured before
starting a new card session.
21
28
27
24
22
26
25
23
20
19
18
17
16
15
NC
CIO
EVCC
SCL
SDA
CC8
CPRES
CLK
C4
I/O
A2
A1
A0
PRES/INT
/CK
/RST
/3V
AT83C24 and for AT83C24NDS
CMDVCC
CVCCin
CVCC
CVSS
VSS
V
LI
CC
QFN28 pinout
1
6
7
2
3
5
4
28
8
27
9 10 11 12 13 14
TOP VIEW
26
QFN 28
25
24
23
22
AT83C24
20
19
21
18
17
16
15
NC
SDA
SCL
EVCC
A2
A1
A0
/CK
/RST
/3V
CC
or
3