NCN6004A_06 Datasheet, PDF (7/40 Pages) ON Semiconductor – Dual SAM/SIM Interface Integrated Circuit

NCN6004A
PIN DESCRIPTION (continued)
Pin
Symbol
28 PWR_VCC_A
Type
POWER
Description
This pin is connected to the positive external power supply. The device sustains any
voltage from +2.7 V to +5.5 V. This voltage supplies the NCN6004A internal circuits and
is regulated by the internal DC/DC converter to provide the DC voltage to the external
card. A high quality capacitor must be connected across pin 28 and PWR_GND, 10
mF/6.0 V ceramic X7R or X5R type is recommended.
Note: The voltage present at pin 28 and 33 must be equal to the voltage present at pin 42.
29 CRD_VCC_A
POWER
This pin provides the power supply to the external smart card #A. The V_CC voltage is
defined by programming the NCN6004A accordingly. Since the cards have independent
DC/DC converter, the output voltage can have any value independently from CARD_B.
A high quality, low ESR capacitor is mandatory to achieve the V_CC specifications. Using
two 4.7 mF/6.0 V ceramic X7R or X5R capacitors in parallel is recommended.
30 CRD_CLK_A
OUTPUT
This pin is connected to the CLK external smart card #A pin. The signal comes from the
built−in frequency divider dedicated to the #A card. The clock is selected and controlled by
setting the logic inputs according to Table 1. The slope of the output clock can be selected
between one of the two programmable mode: SLOW or FAST (Table 8). The pin is
hardwired to zero, the bias being provided by the V_CC supply, when either the V_CC voltage
drops below 2.7 V, or during the CRD_VCC_A startup time.
31 CRD_CLK_B
OUTPUT
This pin is connected to the CLK external smart card #B pin. The signal comes from the
built−in frequency divider dedicated to the #B card. The clock is selected and controlled by
setting the logic inputs according to Table 1. The slope of the output clock can be selected
between one of the two programmable mode: SLOW or FAST (Table 8). The pin is
hardwired to zero, the bias being provided by the V_CC supply, when either the V_CC voltage
drops below 2.7 V, or during the CRD_VCC_B startup time.
32 CRD_VCC_B
POWER
This pin provides the power supply to the external smart card #B. The V_CC voltage is
defined by programming the NCN6004A accordingly. Since the cards have independent
DC/DC converter, the output voltage can have any value independently from CARD_A.
A high quality, low ESR capacitor is mandatory to achieve the V_CC specifications. Using
two 4.7 mF/6.0 V ceramic X7R or X5R capacitors in parallel is recommended.
33 PWR_VCC_B
POWER
This pin is connected to the positive external power supply. The device sustains any
voltage from +2.7 V to +6.0 V. This voltage supplies the NCN6004A internal circuits and
is regulated by the internal DC/DC converter to provide the DC voltage to the external
card. A high quality capacitor must be connected across pin 33 and PWR_GND,
10 mF/6.0 V ceramic X7R type is recommended.
Note: The voltage present on pin 28 and 33 must be equal to the voltage present on pin 42
34
L2b
POWER
Connects one side of the external DC/DC converter inductor #B (Note 1).
35
L1b
POWER
Connects one side of the external DC/DC converter inductor #B (Note 1).
36
PWR_GND
POWER
This pin carries the power current flow coming from the built in DC/DC converters. It is
associated with the external card # B. It must be connected to the system Ground and
care must be observed at PCB layout level to avoid the risk of spike voltages on the logic
lines.
37
CRD_IO_B
INPUT/OUTPUT This pin carries the data serial connection between the external smart card #B and the
microcontroller. A built−in bi−directional level shifter is used to adapt the card and the
MCU, regardless of the power supply voltage of each signals.
This pin is biased by a pull up resistor connected to CRD_VCC_A. When CS = High, the
CRD_IO_A holds the previous I/O logic state and resume to a normal operation when this
pin is reactivated.
The pin is hardwired to zero, the bias being provided by the V_CC supply, when either the
V_CC voltage drops below 2.7 V, or during the CRD_VCC_B startup time.
38 CRD_RST_B
OUTPUT
This pin is connected to the external smart card #B to support the RESET signal. A
built−in level shifter is used to adapt the card and the MCU, regardless of the power
supply voltage of each signals.
The signal present at this pin is latched upon either CARD_SEL or CS or PGM positive
going transient and resume to a transparent mode when card #B is selected.
The pin is hardwired to zero, the bias being provided by the V_CC supply, when either the
V_CC voltage drops below 2.7 V, or during the CRD_VCC_B startup time.
1. The external inductors shall preferably have the same values. Depending upon the power absorbed by the load, the inductor can range
from 10 mH to 47 mH. To achieve the highest yield, the inductor shall have an ESR < 1.0 W.
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