求助,用过MAX1898电源管理芯片的大侠进

zxpla

求助,用过MAX1898电源管理芯片的大侠进 [复制链接]

如图我用单片机和此芯片连接作了个充电器。,CT和RESTRT之间的电容,是100nf，根据数据手册的公式其充电时间是最多3小时，但是我接上电池1小时后，LED就开始闪烁了。手册给出了四种情况，我的就属于第四种：LED开始频闪，电压小于2.5V（就是没达到4.5V的电池充满电压），到达了100nf电容的预设时间45分钟（我试验时候计时了，还真是45分钟，1分不差）
45No battery or no charger input. High impedance (LED off) ---The cell voltage is less than 2.5V and charge current is regulated to 10% of the selected fastcharge current (prequalification state).
Low impedance (LED on)----Cell voltage is greater than 2.5V (fast-charge state).
Low impedance (LED on)----Charge cycle complete—charge current is less then 20% of the selected fast charge current or safety timer expires (3 hours for CCT = 100nF).
High impedance (LED off)-----Charge cycle fault—the cell voltage is less than 2.5V and the prequalification timer (45min for CCT
= 100nF) has expired. Blinking, LED on 50% dutyfactor, 1.5Hz
焊接肯定没问题，但是我的对技术手册的理解感觉很生涩，图和附件附下，望前辈们百忙中帮我分析一下问题的症结，感激不尽！

[ 本帖最后由 zxpla 于 2010-5-9 07:11 编辑 ]