 |
数据搜索系统，热门电子元器件搜索 |
|
|
数据搜索系统，热门电子元器件搜索 |
|
L9963E 数据表(PDF) 66 Page - STMicroelectronics |
|
|
|||||||||||||||||||||||||||||
L9963E 数据表(HTML) 66 Page - STMicroelectronics |
|
|
66 / 184 page  • Direct conversion of the voltage VBATT_MONITOR at VBAT pin through internal resistive divider (within the VBAT Conversion step of the Voltage Conversion Routine). The result is compared to the VBAT_CRITICAL_OV_TH or VBAT_CRITICAL_UV_TH fixed thresholds. This diagnostic is mainly intended to protect the IC against AMR violation on VBAT pin. It can also be used as a redundant coherency check with the arithmetic sum of cells. • Continuous sense of the VBAT pin voltage with a VBAT_UV/OV comparator, featuring fixed thresholds (VBAT_OV_WARNING (COMP) and VBAT_UV_WARNING (COMP)). It is used as an “over voltage warning” or an “under voltage warning”. This diagnostic is intended to provide a fast reaction against transient overvoltage and undervoltage events. This UV/OV comparator is always enabled in order to guarantee a continuous safety check on VBAT voltage. Refer to Table 40 for the electrical parameters. 4.11.2.1 VBAT over-voltage The aim of this diagnostic is to detect a dangerous increase of battery voltage in order to protect the circuitry connected to VBAT. If VBAT > VBAT_OV_WARNING (COMP) (for a time longer than TVBAT_FILT) or VBATT_SUM > VBAT_OV (SUM) or VBATT_MONITOR > VBAT_CRITICAL_OV_TH the over-voltage fault is directly reported in registers and notified to the microcontroller with 3 dedicated flags, according to the Fault communication procedure. In case of VBAT overvoltage detection during voltage conversion routine (violation of VBAT_OV (SUM) or VBAT_CRITICAL_OV_TH). • Corresponding fault flag is set and latched into register VSUM_OV or VBATTCRIT_OV • Fault is propagated through the FAULT Line • Voltage conversion routine goes into Configuration Override In case of VBAT overvoltage detection through the analog comparator (VBAT_OV_WARNING): • Corresponding fault flag is set and latched into register VBATT_WRN_OV • Fault is propagated through the FAULT Line • Voltage conversion routine is not involved, since this diagnostic is not part of the routine steps For further details see Section 4.12 Voltage conversion routine. 4.11.2.2 VBAT under-voltage The aim of this diagnostic is to detect a decrease of battery voltage in order to notify this fault that may cause system malfunctions. If VBAT < VBAT_UV_WARNING (COMP) (for a time longer than TVBAT_FILT) or VBATT_SUM < VBAT_UV (SUM) or VBATT_MONITOR < VBAT_CRITICAL_UV_TH the under-voltage fault is reported in the register and notified to the microcontroller with 3 dedicated flags, according to the Fault communication procedure. In case of VBAT undervoltage detection during voltage conversion routine (violation of VBAT_UV (SUM) or VBAT_CRITICAL_UV_TH): • Corresponding fault flag is set and latched into register VSUM_UV or VBATTCRIT_UV • Fault is propagated through the FAULT Line • Balance is stopped on the whole stack • Voltage conversion routine goes into Configuration Override In case of VBAT undervoltage detection through the analog comparator (VBAT_UV_WARNING): • Corresponding fault flag is set and latched into register VBATT_WRN_UV • Fault is propagated through the FAULT Line • Voltage conversion routine is not involved, since this diagnostic is not part of the routine steps In case of VBAT pin loss, the internal resistive divider will pull-down VBAT to GND, thus causing VBAT UV failure and, eventually, POR. For further details see Section 4.12 Voltage conversion routine. L9963E Safety and diagnostic features DS13636 - Rev 12 page 66/184 |
|
链接网址 |
| ALLDATASHEET是否为您带来帮助? [ DONATE ] |
关于 Alldatasheet | 广告服务 | 联系我们 | 隐私政策 | 数据表链接 | 链接交换 | 制造商名单 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 |
Chinese ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
