NCN6804MNR2G ON Semiconductor, NCN6804MNR2G Datasheet - Page 24

• Manufacturer Part Number: NCN6804MNR2G
• Description: IC SMART CARD DUAL W/SPI 32-QFN
• Manufacturer: ON Semiconductor

Specifications of NCN6804MNR2G

• Applications: Smart Card
• Interface: 4-Wire SPI Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Package / Case: 32-TFQFN Exposed Pad
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: NCN6804MNR2G; NCN6804MNR2GOSTR

Input Schmitt Triggers
circuits to protect the NCN6804 against uncontrolled
operation. The typical dynamic characteristics of the related
pins are depicted Figure 24.
Security Features
card, the NCN6804 provides security features to prevent
irreversible failures as described here after.
Pin Current Limitation: In the case of a short circuit to
ground, the current forced by the device is limited to 15 mA
for any pins, except CRD_CLK A/B pin which is limited to
70 mA. No feedback is provided to the external MPU.
DC/DC Operation: The internal circuit continuously senses
the CRD_VCCA/B voltage; in the case of either over or
undervoltage situation it updates the READ_REG register
accordingly and forces the INT Pin to Low. This register can
be readout by the MPU.
OFF
V
OUTPUT
ON
All the Logic Input pins have built in Schmitt trigger
In order to protect both the interface and the external smart
BAT
VDDPA/B Decoupling
Figure 24. Typical Schmitt Trigger Characteristic
Capacitor 10 mF
LA 22 mH
LB 22 mH
0.3 VBAT
0.7 VBAT
Figure 25. Example of PCB Device Implementation
VBA
T
INPUT
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CRD_VCCA Reservoir Capacitor
10 mF, 1210, X7R, 16 V
Battery Voltage: Both the Over and Undervoltage are
detected by the NCN6804, the READ_REG register being
updated accordingly. The external MPU can read the register
through the MISO pin to take whatever is appropriate to
cope with the situation.
ESD Protection
HBM ESD voltage protection (JEDEC standard) in excess
of 8 kV for all the CRD pins (CRD_IOA/B, CRD_CLKA/B,
CRD_RSTA/B, CRD_V
have a protection of 4 kV HBM. All the other pins
(microcontroller side) sustain at least 2 kV.
integrity without considering the external capacitors added
to the circuit for a proper operating. Consequently in the
operating conditions it is able to sustain much more than
8 kV on its CRD pins making it perfectly protected against
electrostatic discharge well over the HBM ESD voltages
required by the ISO7816 standard.
Printed Circuit Board Layout
and efficient operating of the device in its application
environment and to fully exploit its performance. The
bypass capacitors have to be connected as close as possible
to the device pins (CRD_VCCA/B, VDD or VDDPA/B) in
order to reduce as much as possible parasitic behaviors
(ripple and noise). It is recommended to use ceramic
capacitors (very low ESR).
connected to the ground. A relatively large ground plane is
recommended. Figure 25 shows a example of PCB device
implementation and component routing.
The NCN6804 dual smart card interface features an
These values are guaranteed for the device in its full
Careful layout routing will be applied to achieve a good
The exposed pad of the QFN−32 package will be
CCA/B
and GND). CRD_DETA/B
V
Capacitor 100 nF
DD
Decoupling