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參數(shù)資料
| 型號： | NCN4557MTR2G |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 12/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SMART CARD/SIM DUAL 16-QFN |
| 標準包裝： | 3,000 |
| 系列： | * |
| 應用： | * |
| 接口： | * |
| 電源電壓： | * |
| 封裝/外殼： | 16-WFQFN 裸露焊盤 |
| 供應商設備封裝： | 16-QFN（3x3） |
| 包裝： | 帶卷 (TR) |
| 安裝類型： | 表面貼裝 |
NCN4557
http://onsemi.com
9
APPLICATION INFORMATION
The NCN4557 is a dual LDObased DC/DC converter
and level shifter able to handle independently 2 smart card
interfaces. When one of these interfaces is operating the
other one is not active and conversely. Class B (3.0 V) and
C (1.8 V) cards can be used.
The Card and the CRD_VCC power supply are selected
using the pins SEL0, SEL1 and ENABLE according to
Table 1.
Table 1. CARD AND CRD_VCC SELECTION
ENABLE
SEL1
SEL0
Card# / CRD_VCC
1
0
Card A / 1.8 V
1
0
1
Card A / 3.0 V
1
0
Card B / 1.8 V
1
Card B / 3.0 V
0
X
A & B Disabled
Card Supply Converter
The builtit NCN4557 DC/DC converters are Low
DropOut Voltage Regulators capable to supply a current
in excess of 50 mA under 1.8 V or 3.0 V. These voltages are
selected according to Table 1. Using the Boolean input
ENABLE pin the NCN4557 device can be disabled setting
the circuit in a shutdown mode for which the power
consumption features values typically in the range of a few
tens of nA. Figure 9 shows a simplified view of the
NCN4557 voltage regulator. The CRD_VCC output is
internally current limited and protected against short
circuits. The shortcircuit current IVCC varies with VBAT
typically in the range of 30 mA to 60 mA.
In order to guarantee a stable and satisfying operating of
the LDO the CRD_VCC output will be connected to a
1.0
mF bypass ceramic capacitor to the ground. At the
input, VBAT will be bypassed to the ground with a 0.1
mF
ceramic capacitor.
GND
Ilim
+
+
ENABLE
VBAT
CRD_VCC
R1
R2
Q1
Cin = 0.1 mF
Cout = 1.0
mF
Vref
Figure 9. Simplified Block Diagram of the LDO
Voltage Regulator
Level Shifters
The level shifters accommodate the voltage difference
that might exist between the microcontroller and the smart
card. The RESET and CLOCK level shifters are
monodirectional and feature both the same architecture.
The
bidirectional
I/O
line
provides
a
way
to
automatically adapt the voltage difference between the
controller and the card in both directions. In addition with
the pullup resistor, a dynamic pullup circuit (Figure 10,
Q1 and Q2) provides a fast charge of the stray capacitance,
yielding a rise time fully within the ISO7816, EMV and
GSM specifications.
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