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LTC1556 Datasheet(PDF) 5 Page - Linear Technology |
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LTC1556 Datasheet(HTML) 5 Page - Linear Technology |
5 / 12 page 5 LTC1555/LTC1556 LTC1555/LTC1556 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 (see Figure 1). DDRV (Pin 4): Optional Data Input Pin for Sending Data to the SIM card. When not needed, the DDRV pin should be left floating or tied to DVCC (an internal 1µA current source will pull the DDRV pin up to DVCC if left floating). DVCC (Pins 5/7): Supply Voltage for Controller Side Digital I/O Pins. May be between 1.8V and 5.5V (typically 3V). SS (Pins 6/8): Soft Start Enable Pin. A logic low will enable the charge pump inrush current limiting feature. A logic high will disable the soft start feature and allow VCC to be ramped as quickly as possible upon start-up and coming out of shutdown. M1 (Pins 7/9): Mode Control Bit 1 (see Truth Table). M0 (Pins 8/10): Mode Control Bit 0 (see Truth Table). This table defines the various operating modes that may be obtained via the M0 and M1 mode control pins. Truth Table M0 M1 MODE 0V 0V Shutdown (VCC = 0V) 0V DVCC VCC = VIN DVCC 0V VCC = 3V DVCC DVCC VCC = 5V GND (Pins 9/11, 12): Ground for Both the SIM and the Controller. Should be connected to the SIM GND contact as well as to the VIN/Controller GND. Proper grounding and supply bypassing is required to meet 10kV ESD specifications. C1– (Pins 10/12): Charge Pump Flying Capacitor Nega- tive Input. C1+ (Pins 11/13): Charge Pump Flying Capacitor Positive Input. VIN (Pins 12/14): Charge Pump Input Voltage Pin. Input voltage range is 2.7V to 10V. Connect a 10 µF low ESR input bypass capacitor close to the VIN pin. VCC (Pins 13/15): SIM Card VCC Output. This pin should be connected to the SIM VCC contact. The VCC output voltage is determined by the M0 and M1 pins (see Truth Table). VCC is discharged to GND during shutdown (M0, M1 = 0V). A 10 µF low ESR output capacitor should connect close to the VCC pin. I/O (Pins 14/18): 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 when the part is in shutdown. RST (Pins 15/19): Level Shifted Reset Output Pin. Should be connected to the SIM RST contact. CLK (Pins 16/20): 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. PIN FUNCTIONS |
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