ncn6004a ON Semiconductor, ncn6004a Datasheet - Page 33

• Manufacturer Part Number: ncn6004a
• Description: Dual Sam/sim Interface Integrated Circuit
• Manufacturer: ON Semiconductor

ESD Protection
pins against the ESD spikes voltages. To cope with the
different ESD voltages developed across these pins, the built
in structures have been designed to handle either 2 kV, when
related to the microcontroller side, or 8 kV when connected
with the external contacts. Practically, the CRD_RST,
CRD_CLK, CRD_IO, CRD_C4 and CRD_C8 (both A and
B sections) pins can sustain 8 kV, the maximum short circuit
current being limited to 15 mA. The CRD_VCC_A and
CRD_VCC_B pins have the same ESD protection, but can
source up to 65 mA continuously each, the absolute
maximum current being 150 mA per section.
Security Features
card, the NCN6004A provides security features to prevent
catastrophic failures as depicted here after.
ground, the current forced by the device is limited to 10 mA
for any pins, except CRD_CLK_A and CRD_CLK_B pins
The NCN6004A includes silicon devices to protect the
In order to protect both the interface and the external smart
Pin Current Limitation: in case of a short circuit to
NOTE:
Figure 34. Typical I/O Rise and Fall Time
Both sides of the interface run with open drain load
(worst case condition)
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NCN6004A
33
which are both limited to 70 mA. No feedback is provided
to the external MPU.
senses the CRD_VCC_A and CRD_VCC_B voltages and,
in the case of either over or under voltage situation, update
the STATUS register accordingly. This register can be read
out by the MPU but no interrupts are activated.
CRD_VCC_A or CRD_VCC_B output, during either the
power on sequence or when the system was previously
running, the NCN6004A generates an interrupt by pulling
down the INT pin. It is up to the microcontroller to identify
the origin of the overload by reading the STATUS pin
accordingly.
Negative going voltage are detected by the NCN6004A, a
POWER_DOWN sequence and the STATUS register being
updated accordingly. The external MPU can read the
STATUS pin to take whatever is appropriate to cope with the
situation. The NCN6004A does not provide any further
internal voltage regulation.
DC/DC Operation: The internal circuit continuously
DC/DC Overload: When an overload is sensed across the
Battery Voltage: Both the Positive going and the