 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
LTC1755 Datasheet(PDF) 9 Page - Linear Technology |
|
||||||||||||||||||||||||||||||
LTC1755 Datasheet(HTML) 9 Page - Linear Technology |
|
|
9 / 16 page  9 LTC1755/LTC1756 The READY pin is configured as an open-drain pull-down with a weak pull-up current source. This permits wired- OR connections of multiple LTC1755/LTC1756s to a single microcontroller. ALARM (Pin 22, LTC1755 Only): (Output) A low on this pin indicates that a fault has occurred and that the LTC1755 is in the Alarm state (see the State Diagram). Possible faults include VCC underrange for at least 5µs, overtem- perature shutdown, CLK or RST invalid output levels, and card removal during the Active state. CLK or RST invalid and overtemperature faults are de- tected only after VCC has reached its final value (as indicated by the READY pin). VCC underrange and card removal during Active faults are detected at any time during the Active period (i.e., once PWR = 0V). The ALARM pin is configured as an open-drain pull-down with a weak pull-up current source. This permits wired- OR connections of multiple LTC1755s to a single micro- controller. PI FU CTIO S LTC1755/LTC1756 CARD (Pin 23/15): (Output) Level-Shifted and Debounced PRES Signal from the Smart Card Acceptor Switch. When a valid card indication appears, this pin communicates the presence of the Smart Card to the microcontroller. The CARD pin has an open-drain active pull-down with a weak pull-up current source for logic-OR connections. The debounce circuit ensures that a card has been present for a continuous period of at least 40ms before asserting CARD low. The CARD pin returns high within 50 µs of card removal. The PRES pin, in conjunction with the NC/NO pin, determines if a card is present. 5V/3V (Pin 24/16): (Input) Controls the output voltage (VCC) of the DC/DC converter during the Active state. A valid high sets VCC to 5V. A valid low sets VCC to 3V. The 5V/3V pin is latched on the falling edge of the PWR pin. When PWR is low, changes on the 5V/3V pin are ignored. To change the voltage on VCC the LTC1755/LTC1756 must first be returned to the Idle state by bringing the PWR pin high. DVCC sets the logic reference level for the 5V/3V pin. |
Similar Part No. - LTC1755_1 |
|
Similar Description - LTC1755_1 |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
