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LTC1555L-1.8 Datasheet(PDF) 5 Page - Linear Technology |
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LTC1555L-1.8 Datasheet(HTML) 5 Page - Linear Technology |
5 / 8 page LTC1555L-1.8 5 VIN (Pin 12): Charge Pump Input Pin. May be between 2.6V and 6V. There is no power-up sequencing requirement for VIN with respect to DVCC. VCC (Pin 13): SIM Card VCC Output. Should be connected to the SIM VCC contact. The VCC output voltage is deter- mined by the M0-M2 pins (see Table 1). VCC is discharged to GND during shutdown (M0, M1 = 0V). A 2.2 µF low ESR ouptut capacitor should connect close to the VCC 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 Ω 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 M1 M2 OPERATING MODE 0V 0V 0V or DVCC Shutdown (VCC = 0V) 0V DVCC 0V or DVCC VCC = VIN DVCC 0V 0V VCC = 3V DVCC 0V DVCC VCC = 1.8V DVCC DVCC 0V or DVCC VCC = 5V Table 1. Truth Table PIN FUNCTIONS 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 VIN/controller GND. Proper grounding and supply bypassing is required to meet 10kV ESD specifications. C1– (Pin 10): Charge Pump Flying Capacitor Negative Input. C1+ (Pin 11): Charge Pump Flying Capacitor Positive Input. BLOCK DIAGRA DDRV OPTIONAL 1 µA I/O DATA 20k 10k CLK CIN RST DVCC M2 1.8V RIN GND M1 M0 VIN VBATT CIN 1 µF VCC I/O CLK RST GND VCC C1+ 0.1 µF C1– STEP-UP/ STEP-DOWN CHARGE PUMP DC/DC CONVERTER SIM CONTROLLER VCC COUT 2.2 µF UVLO LTC1555L-1.8 1555L BD |
Similar Part No. - LTC1555L-1.8_15 |
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Similar Description - LTC1555L-1.8_15 |
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