 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
PC8374L Datasheet(PDF) 33 Page - National Semiconductor (TI) |
|
|
|
|||||||||||||||||||||||||||||
PC8374L Datasheet(HTML) 33 Page - National Semiconductor (TI) |
|
|
33 / 239 page  2.0 Power, Reset and Clocks (Continued) Revision 1.1 33 www.national.com Figure 1 shows the power state transitions: 2.1.3 Power Connection and Layout Guidelines The PC8374L requires a power supply voltage of 3.3V ± 10% for both the VDD3 and VSB3 supplies. The on-chip Core power converter generates a voltage below 3V for the internal logic. The device is designed to operate with a Lithium backup bat- tery supplying up to 3.6V. Therefore, it includes an internal current-limiting resistor on the VBAT input to prevent the battery from shorting, as required by the UL regulations. If the system implementation does not require backup power for the PC8374L device, the VBAT pin must be connected to VSB3. VDD3, VSB3, VCORF and VBAT use a common ground return marked VSS. To obtain the best performance, bear in mind the following recommendations. Table 6. Power States and Related Power Planes Power State Main (VDD3) Standby (VSB3) Core (VCORF) 1 1. VCORF is generated from VSB3; therefore, both voltages are on or off at approximately the same time. VBAT Battery Fail2 2. This power state applies only to the SWC functions and Health Management configuration pow- ered by VBAT. On or Off On or Off On or Off Off Power Fail Off Off Off On or Off Power Off Off On On On or Off PowerOn On On On OnorOff Illegal3 3. Operation is not guaranteed and register data may be corrupted. However, at power-on/off, the device may temporarily enter this power state due to the different rise/fall times of the VDD3 and VSB3 power supplies. On Off Off On or Off VDD3, VSB3, VCORF On or Off Battery Fail VDD3, VSB3 and VCORF Off, Power Fail VDD3 Off, Power Off VDD3, VSB3, VCORF and VBAT On Power On VBAT Power-Up Reset VSB3 On, VDD3 On, VBAT Off VSB3 Off VDD3 Off VSB3 On VBAT Off VDD3 On VBAT Off VSB Power-Up Reset VDD Power-Up Reset and VBAT Off VBAT On VSB3, VCORF and VBAT On VSB3 Off VBAT Off Figure 1. Power State Transitions SWC functions, Health Manage- ment configuration powered by VBAT Transitions from either Power Off or Power On to Battery Fail and back are allowed, however not recommended, since they cause data loss in the VBAT-powered registers, after VSB3 is turned off (Power Fail). VBAT On VBAT On VBAT On Winbond Electronics Corp. Advanced PC Product Center |
|
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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
