 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
CPLL Datasheet(PDF) 23 Page - Exar Corporation |
|
|
|||||||||||||||||||||||||||||
CPLL Datasheet(HTML) 23 Page - Exar Corporation |
|
|
23 / 29 page  X XR RP P7 77 72 24 4 Q Qu ua ad d C Ch ha an nn ne ell D Diig giitta all P PW WM M/ /P PF FM M P Prro og grra am mm ma ab blle e P Po ow we err M Ma an na ag ge em me en ntt S Sy ys stte em m © 2012 Exar Corporation 23/29 Rev. 1.0.1 In the case of shutting down the faulting channel and auto-restarting, the user has an option to specify startup timeout (the time in which the fault is validated) and hiccup timeout (the period after which the controller will try to restart the channel) periods in 1 msec increments with a maximum value of 255 msec. Note: a channel will share a response to an OCP or OVP event. Start-up Time-out Fault A channel will be at Start-up Time-out Fault if it does not come-up in a time period specified in the “Startup Timeout” box. In addition, a channel is at Start-up Timeout Fault if in pre- bias configuration voltage is a defined value too close to the target. When the fault is generated, the host will be notified by the SUPPLY_FAULT_EVENT interrupt generated by the controller. The host then can use an I2C command to check which channel is at fault. LDO5 OCP When current is drawn from LDO5 exceeds LDO5 current limit the controller gets reset. LDO3.3 OCP When current drawn from LDO3.3 exceeds LDO3.3 current limit the regulator gets shut down, a fault is generated, and the host will be notified by the SUPPLY_FAULT_EVENT interrupt generated by the controller. The host then can through an I2C command check which channel/regulator is at fault. Once the fault condition is removed, the host needs to turn the regulator on again. V5EXT SWITCHOVER The V5EXT gives a user an opportunity to supply an external 5 Volt rail to the controller in order to reduce the controller’s power dissipation. The 5 Volt rail can be an independent power rail present in a system or any of 7724 channels regulated to 5 Volts (in the PFM mode in particular) and routed back to the V5EXT pin. It is important to mention that voltage to Vcc must be applied all the time even after the switchover in which case the current drawn from Vcc supply will be minimal. If the function not used, we recommend the pin to be either grounded or left floating in conjunction with making sure the function gets disabled through register settings. V5EXT switchover control The function is enabled in PA5. The switchover thresholds are programmable in 50mV steps with a total range of 200mV. Hysteresis to go in-out is 150mV. LDO5 automatically turns off when the external voltage is switched in and turns on when the external voltage drops below the lower threshold. When the controller switches over to the V5EXT rail, the V5EXT_RISE interrupt is generated to inform the host. Similarly, when the controller switches out, the V5EXT_FALL interrupt gets generated. EXTERNAL CLOCK SYNCHRONIZATION XRP7724 can be run off an external clock available in the system or another XRP7724. The external clock must be in the ranges of 10.9MHz to 14.7MHz or 21.8MHz to 29.6MHz. Locking to the external clock is done through an internal Phase Lock Loop (PLL) which requires an external loop capacitor of 2.2nF to |
|
Link URL |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link to Datasheet | 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 |
Indian ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
