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2400327_zh-CN
2400327_zh-CN
您好，NXP，
我们正在计算RTC的电池寿命，RT1176中SNVS功率域需要活动电流和睡眠电流。
但是请参阅数据表 IMXRT1170BIEC - 表 13，第 35 页，其中只给出了睡眠电流。
请与我们联系影响 SNVS 功率域有功电流的因素以及与有功电流相关的各种计算方法。
嗨@specneeraj ，
感谢您对 NXP MIMXRT 系列产品的关注！
VDD_SNVS_IN 为 SNVS/RTC 功能域供电。该域是一个始终开启的低功耗域，主要维护 32 kHz RTC、SNVS 逻辑以及相关的唤醒和功能安全。其当前功耗与 CM7/CM4 的活动/睡眠状态的相关性很弱；因此，表 13 中列出的 SNVS 模式的 VDD_SNVS_IN 值不是省略的“仅睡眠”数据，而是可以在 RTC 备份场景中使用的基准值。
- 如果纽扣电池仅在主电源故障时供电 → 直接使用 SNVS 模式电流估算；
- 如果纽扣电池在系统活动期间也向
VDD_SNVS_IN供电，则根据活动/SNVS 占空比计算平均电流。
影响 SNVS 电流的主要因素包括温度、 VDD_SNVS_IN电压、工艺偏差、32 kHz RTC 晶体/板的漏电流、SNVS 相关引脚的外部漏电流，以及设备是否实际进入 SNVS 模式。更多详情请参考AN13104 。
此致，
加文
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