Electronic Components Datasheet Search |
|
EM6323LZSP5B1.6 Datasheet(PDF) 9 Page - EM Microelectronic - MARIN SA |
|
EM6323LZSP5B1.6 Datasheet(HTML) 9 Page - EM Microelectronic - MARIN SA |
9 / 10 page EM6323/24 Copyright © 2006, EM Microelectronic-Marin SA 03/06 - rev.H 9 www.emmicroelectronic.com Watchdog Input If the watchdog timer has not been cleared within tWD (1.6s typ.), reset asserts. The internal 1.6s timer is cleared by either a reset pulse or by toggling WDI. While reset is asserted, the timer remains cleared and does not count. As soon as reset is released, the timer starts counting. If the microcontroller I/O connected to WDI is put in a high impedance condition, the circuit will detect this condition as a microcontroller in sleep mode and prevent its watchdog from timing out. To monitor a high impedance or a three state condition on WDI, the watchdog input is internally driven low during the first 15/16 of the watchdog timeout period and high for the last 1/16 of the watchdog timeout period. When WDI is left unconnected, this internal driver clears the 1.6s timer every 1.5s. When WDI is three-stated or unconnected, the maximum allowable leakage current is 0.5µA. To minimized the overall system power consumption and therefore for a minimum watchdog input current leave WDI low for the majority of the watchdog timeout period, pulsing it low-high-low once within the first 15/16 of the watchdog timeout period to reset the watchdog timer. If WDI is externally driven high for the majority of the timeout period, up to 35µA can flow into WDI. Meanwhile when the microcontroller is not in sleep mode, the output of the microcontroller which drives WDI has to be strong enough to fight the 35µA. RESET 1/16 t WD 15/16 t WD V DD t POR WDI Pullup OFF ON OFF WDI Pulldown ON OFF ON t WD Fig. 15 WDI Input Timing Diagram V DD GND WDI Transition Detector Watchdog Logic + Timer 1/16 t WD 15/16 t WD Pullup Pulldown Fig. 16 WDI Input Stage Block Schematic 0.0 3.0 6.0 9.0 12.0 15.0 -50 -25 0 25 50 75 100 125 [ °C ] [ uA ] Fig. 17 WDI Input Current Low-level IIL vs. Temperature (VDD=5.5V) 0.0 5.0 10.0 15.0 20.0 25.0 -50 -25 0 25 50 75 100 125 [ °C ] [ uA ] Fig. 18 WDI Input Current High-Level IIH vs. Temperature (VDD=5.5V) |
Similar Part No. - EM6323LZSP5B1.6 |
|
Similar Description - EM6323LZSP5B1.6 |
|
|
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 |