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參數(shù)資料
| 型號(hào)： | LTC1555L-1.8 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | SIM Power Supply and Level Translator(SMI電源和電平轉(zhuǎn)換器) |
| 中文描述： | SIM卡電源和電平轉(zhuǎn)換（學(xué)校管理新措施電源和電平轉(zhuǎn)換器） |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 138K |
| 代理商： | LTC1555L-1.8 |
LTC1555L-1.8
4
PI
FU
CTIO
N
S
U
U
CIN (Pin 1):
Clock Input Pin from Controller.
RIN (Pin 2):
Reset Input Pin from Controller.
DATA (Pin 3):
Controller Side Data Input/Output Pin. Can
be used for single pin bidirectional data transfer between
the controller and the SIM card as long as the controller
data pin is open drain. The controller output must be able
to sink 1mA max when driving the DATA pin low due to the
internal pull-up resistors on the DATA and I/O pins. If the
controller data output is not open drain, then the DDRV pin
should be used for sending data to the SIM card and the
DATA pin used for receiving data from the SIM card.
DDRV (Pin 4):
Optional Data Input Pin for Sending Data to
the SIM Card. When not needed, the DDRV pin should
either be left floating or tied to DV
CC
(an internal 1
μ
A
current source will pull the DDRV pin up to DV
CC
if left
floating).
DV
CC
(Pin 5):
Supply Voltage for Controller Side Digital
Input/Output Pins (typically 3V). May be between 1.425V
and 4.4V. The DV
CC
supply may be powered-down in
shutdown for further reduction in battery current. When
DV
CC
drops below 1.2V, the charge pump is disabled and
the LTC1555L-1.8 goes into shutdown mode regardless
of the signals on the M0-M2 pins.
M2 (Pin 6):
Mode Control Bit 2 (see Table 1). (Pin 6 was
previously used for soft-start control on the LTC1555.)
M1 (Pin 7):
Mode Control Bit 1 (see Table 1).
M0 (Pin 8):
Mode Control Bit 0 (see Table 1).
GND (Pin 9):
Ground for Both the SIM and the Controller.
Should be connected to the SIM GND contact as well as to
the V
IN
/controller GND. Proper grounding and supply
bypassing is required to meet 10kV ESD specifications.
C1
–
(Pin 10):
Charge Pump Flying Capacitor NegativeInput.
C1
+
(Pin 11):
Charge Pump Flying Capacitor PositiveInput.
V
IN
(Pin 12):
Charge Pump Input Pin. May be between 2.6V
and 6V. There is no power-up sequencing requirement for
V
IN
with respect to DV
CC
.
V
CC
(Pin 13):
SIM Card V
CC
Output. Should be connected
to the SIM V
CC
contact. The V
CC
output voltage is deter-
mined by the M0-M2 pins (see Table 1). V
CC
is discharged
to GND during shutdown (M0, M1 = 0V). A 2.2
μ
F low ESR
ouptut capacitor should connect close to the V
CC
pin.
I/O (Pin 14):
SIM Side I/O Pin. The pin is an open drain
output with a nominal pull-up resistance of 10k
and
should be connected to the SIM I/O contact. The SIM card
must sink up to 1mA max when driving the I/O pin low due
to the internal pull-up resistors on the I/O and DATA pins.
The I/O pin is held active low during shutdown.
RST (Pin 15):
Level Shifted Reset Output Pin. Should be
connected to the SIM RST contact.
CLK (Pin 16):
Level Shifted Clock Output Pin. Should be
connected to the SIM CLK contact. Careful trace routing is
recommended due to fast rise and fall edge speeds.
M0
0V
0V
DV
CC
DV
CC
DV
CC
M1
0V
DV
CC
0V
0V
DV
CC
M2
OPERATING MODE
Shutdown (V
CC
= 0V)
V
CC
= V
IN
V
CC
= 3V
V
CC
= 1.8V
V
CC
= 5V
0V or DV
CC
0V or DV
CC
0V
DV
CC
0V or DV
CC
Table 1. Truth Table
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