 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
BQ2058SNXXXX Datasheet(PDF) 5 Page - Texas Instruments |
|
||||||||||||||||||||||||||||||
BQ2058SNXXXX Datasheet(HTML) 5 Page - Texas Instruments |
|
|
5 / 14 page  Low-Power Sleep Mode The bq2058 enters the low-power sleep mode in two dif- ferent ways: 1. On initial power-up. 2. After the detection of an undervoltage condi- tion–VUV. When the bq2058 enters the low-power sleep mode, DSG is driven high and the device consumes 0.7 µA (typical). The bq2058 only comes out of low-power sleep mode when a valid charge-detect condition exists. Charge Detect The bq2058 continuously monitors for a charge-detect con- dition. A valid charge-detect condition exists when either of the conditions are true: CSL < BAT4N - 70mV (VCD) CSH > BAT1P + 70mV (VCD) A valid charge-detect enables the DSG output, allowing charging of the lithium ion cells. This is accomplished by applying the charging supply to the pack. Undervoltage Undervoltage (or overdischarge) protection is asserted when any cell voltage drops below the VUV threshold and remains below the VUV threshold for a time exceeding a user-configurable delay (tUVD). The DSG output is driven high disabling the discharge of the pack. The bq2058 then enters the low-power sleep mode. Overvoltage Overvoltage (or overcharge) protection is asserted when any cell voltage exceeds the VOV threshold and remains above the VOV threshold for a time exceeding a user- configurable delay (tOVD). The CHG pin is driven high, disabling charge into the battery pack. Charging is dis- abled until a valid charge enable exists. See Charge En- able section. Important note: If any battery pin floats (BAT1P, BAT1N–4N), the bq2058 assumes an overvoltage has occurred. Because of different manufacturers specifications for overvoltage thresholds, the bq2058 can be available with different VOV options. Table 2 summarizes these differ- ent voltage thresholds. The overvoltage threshold limits are programmed at Unitrode. The bq2058 is the standard option that is more readily available for sampling and prototyping purposes. Please contact Unitrode for other voltage threshold and tolerance options. Charge Enable A valid charge enable indicates that an overvoltage (overcharge) condition no longer exists and that the pack is ready to accept further charge. Once overvoltage protection is asserted, charging will not be enabled un- til all cell voltages fall below VCE. The VCE threshold is a function of VOV, and changes with different VOV lim- its. VCE = VOV - 150mV Overcurrent The bq2058 detects an overcurrent (or short circuit) con- dition only in the discharge direction. Overcurrent pro- tection is asserted when either of the conditions occurs and remain for a time exceeding a user-configurable de- lay (tOCD): CSL > BAT4N + VOCL CSH < BAT1P - VOCH where: VOCL = 160mV (low-side detect) VOCH = 160mV (high-side detect) When either of these conditions occurs, DSG is driven high, disconnecting the load from the pack. DSG re- mains high until both of the voltage conditions are false, indicating removal of the short-circuit condition. The user can facilitate clearing these conditions by inserting the battery pack into a charger. The low-side overcurrent sense can be disabled by con- necting CSL to BAT4N. This ensures that CSL is never greater than BAT4N. If low-side detection is disabled, high-side detection must be used with CSH. 5 bq2058 Part No. VOV Limit bq2058 4.25V bq2058C 4.325 bq2058D 4.30V bq2058G* 4.375V bq2058R 4.35V bq2058W 3.4V Table 2. Overvoltage Threshold Options |
Similar Part No. - BQ2058SNXXXX |
|
Similar Description - BQ2058SNXXXX |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | 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
