73S8024C Maxim, 73S8024C Datasheet - Page 9

• Manufacturer Part Number: 73S8024C
• Description: The 73S8024C is a single smart card interface IC, compliant to the electrical requirements of ISO 7816-3 and EMV 4
• Manufacturer: Maxim

DS_8024C_023
8 Activation Sequence
The 73S8024C smart card interface IC has an internal 10 ms delay at power-on reset or upon application
of V
high which indicates a card is present. No activation is allowed at this time. CMDVCC (edge triggered)
must then be set low to activate the card.
The following steps and
when the system controller sets CMDVCC low while the RSTIN is low:
1. CMDVCC is set low.
2. Next, the internal V
3. Turn I/O (AUX1, AUX2) to reception mode at the end of t
4. Due to the fall of RSTIN, CLK is applied to the card at the end of t
5. RST is a copy of RSTIN after t
Rev. 1.3
CMDVCC
Internal RC OSC
DD
the voltage V
low to report a fault to the system controller, and the power V
RST high until 42000 clock cycles after the start of CLK.
RSTIN
t
t
t
> V
1
2
4
VCC
CLK
RST
= 0.510 ms (timing by 1.5 MHz internal Oscillator)
= 1.5 µs, I/O goes to reception state
≥ 42000 card clock cycles (time for RST to become the copy of RSTIN)
IO
DDF
CMDVCC
PWRDN
PRES
or upon exit of Power-Down mode. The card interface may only be activated when OFF is
OFF
Figure 3: Activation Sequence – RSTIN low when CMDVCC goes low
CC
to the card becomes valid during t
CC
Figure 3
control circuit checks the presence of V
t
1
Figure 2: Power Down Mode Operation
After setting PWRDN = 0,
the controller must wait at
show the activation sequence and the timing of the card control signals
least 10ms before setting
4
. RSTIN may be set high before t
CMDVCC=0
~10ms
PWRDN during a card
session has no effect
t
3
= >0.5 µs, CLK starts
OFF follows PRES regardless of PWRDN
t
2
1
. If V
t
CC
2
3
.
does not become valid, then OFF goes
CC
CC
to the card is shut down.
at the end of t
4
3
, however the sequencer won’t set
.
EMV / ISO deactivation
t
4
time ~= 100 uS
PWRDN has effect when
the cardi s deactivated
1
73S8024C Data Sheet
. In normal operation,
9