S-8245C datasheet(21/41 Pages) ABLIC

21 / 41 page

BATTERY PROTECTION IC FOR 3-SERIAL TO 5-SERIAL CELL PACK

Rev.1.4_00

S-8245A/C Series

The detection temperature can be set according to the NTC and RTH characteristics.

For example, if RNTC

*1 and RTH (10 k) are connected to the S-8245AAA, each detection temperature is as follows.

Table 16

Item

Temperature Detection Ratio

RNTC

Detection Temperature

Temperature for high temperature detection

during charging

rTHCH = 0.670

4.9 k



C

Temperature for low temperature detection

during charging

rTHCL = 0.270

27.0 k



C

Temperature for high temperature detection

during discharging

rTHDH = 0.795

2.6 k



C

Temperature for low temperature detection

during discharging

rTHDL = 0.190

42.6 k



10C

*1. The calculation method for RNTC is as follows.

rTHCL = RTH / (RNTC  RTH)

RNTC = RTH / rTHCL  RTH

= 10 k

 / 0.270  10 k

= 27.0 k



When low temperature during charging is detected, RNTC = 27.0 k, so detection temperature = 0C according to

the RNTC characteristics shown in Figure 6.

RNTC = 10 k, Ta = 25C, B constant (25 / 85C) = 3434K

40

25

Ta [

C]

200

140

180

160

100

120

Figure 6 Example of RNTC Characteristics

Remark Temperature detection is carried out intermittently for 512 ms typ. per cycle, of which 1 ms typ. is the

detection operation period.

The VREG pin voltage is output only during detection operation. During other periods, the VREG pin is at

the VDD level.

Regarding details of intermittent operation, refer to "4. Temperature detection (High temperature

detection during charging)" in " Timing Charts".

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