ncn6001 ON Semiconductor, ncn6001 Datasheet - Page 4

• Manufacturer Part Number: ncn6001
• Description: Compact Smart Card Interface Ic
• Manufacturer: ON Semiconductor

PIN FUNCTIONS AND DESCRIPTION
Pin
12
13
14
15
16
17
11
PWR_GND
CRD_VCC
CRD_CLK
GROUND
Lout_L
Name
C8/S0
C4/S1
OUTPUT
POWER
POWER
POWER
SIGNAL
Type
I/O
I/O
NOTE:
NOTE:
This pin is the Power Ground associated with the built−in DC/DC converter and must be
connected to the system ground together with GROUND pin 16. Using good quality
ground plane is recommended to avoid spikes on the logic signal lines.
The High Side of the external inductor is connected between this pin and Lout_H to
activate the DC/DC function. The built−in NMOS and PMOS devices provide the
switching function together with the CRD_VCC voltage rectification (Figure 17).
This pin provides the power to the external card. It is the logic level “1” for CRD_IO,
CRD_RST, CRD_C4, CRD_C8 and CRD_CLK signals.
The energy stored by the DC/DC external inductor Lout must be smoothed by a
10 mF/Low ESR capacitor, connected across CRD_VCC and GND. Using ceramic type of
capacitor (MURATA X5R, ESR < 50 mW) is strongly recommended. In the event of a
CRD_VCC U
information in the STATUS bit. The device does not take any further action, particularly
the DC/DC converter is neither stopped nor re programmed by the NCN6001. It is up to
the external MPU to handle the situation.
However, when the CRD_VCC is overloaded, the NCN6001 shuts off the DC/DC
converter, runs a Power Down ISO sequence and reports the fault in the STATUS
register.
Since high transient current flows from this pin to the load, care must be observed, at
PCB level, to minimize the series ESR and ESL parasitic values. The NCN6001 demo
board provides an example of a preferred PCB layout.
Auxiliary mixed analog/digital line to handle either a synchronous card, or as Chip Select
Identification (MISO, Bit 0): see Figure 9. The pin is driven by an open drain stage, the
pullup resistor being connected to the CRD_VCC supply. When the pin is used as a logic
input (asynchronous cards), the positive logic condition applies:
A built−in accelerator circuit makes sure the output positive going rise time is fully within
the ISO/EMV specifications.
Auxiliary mixed analog/digital line to handle either a synchronous card, or as Chip Select
Identification (MISO, Bit 1): see Figure 9. The pin is driven by an open drain stage, the
pullup resistor being connected to the CRD_VCC supply. When the pin is used as a logic
input (asynchronous cards), the positive logic condition applies:
A built−in accelerator circuit makes sure the output positive going rise time is fully within
the ISO/EMV specifications.
The logic and low level analog signals shall be connected to this ground pin. This pin
must be externally connected to the PWR_GND pin 12. The designer must make sure no
high current transients are shared with the low signal currents flowing into this pin.
This pin is connected to the CLK pin of the card connector. The CRD_CLK signal comes
from the clock selector circuit output. An internal active pull down NMOS device forces this
pin to Ground during either the CRD_VCC startup sequence, or when CRD_VCC = 0 V.
The rise and fall slopes, either FAST or SLOW, of this signal can be programmed by the
MOSI message (Table 2).
Care must be observed, at PCB level, to minimize the pick−up noise coming from the
CRD_CLK line.
The pin is capable of reading the logic level when the chip operates an
asynchronous interface, but is not intended to read the data from the external
card when operated in the synchronous mode. It merely returns the logic state
forced during a write instruction to the card.
The pin is capable of reading the logic level when the chip operates an
asynchronous interface, but is not intended to read the data from the external
card when operated in the synchronous mode. It merely returns the logic state
forced during a write instruction to the card.
http://onsemi.com
Connected to GND → Logic = Zero
Connected to V
Connected to GND → Logic = Zero
Connected to V
VLOW
NCN6001
voltage, the NCN6001 detects the situation and feedback the
4
CC
CC
or left Open → Logic = One
or left Open → Logic = One
Description