CN3305-dat

FB

VBAT = 1.205 ⅹ (1+R4∕R5)

for - LFP-dat

= 1.205 x ( 1 + 510k ∕ 100k) = 1.205 ⅹ 6.1 = 7.36V
= 1.205 x ( 1 + 800k ∕ 100k) = 1.205 ⅹ 9 = 10.845V
= 1.205 x ( 1 + 1000k ∕ 90k) = 1.205 ⅹ 12.11 = 14.6V

for - li-battery-dat

SCH

ref