S-8245C datasheet(20/41 Pages) ABLIC

20 / 41 page

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

S-8245A/C Series

Rev.1.4_00

10. PSI pin

When the PSI pin is activated, the power-saving function starts to operate, and most operations halt. In this case, the

CO pin changes to high impedance, DO pin changes to the VSS level, and the PSO pin changes to the VDD level.

Table 14 Status Set by PSI Pin

PSI Pin

CO Pin

DO Pin

PSO Pin

VPSI  PSI pin voltage  VDD level

"H"

VSS level

VSS level  PSI pin voltage  VPSI

High impedance

VSS level

VDD level

VPSI_C  PSI pin voltage  VSS level

High impedance

VSS level

VDD level

PSI pin voltage

 VPSI_C

"H"

VSS level

Remark The PSI pin is at the VSS level or lower in cascade connection.

Connect a resistor of 5.1 M

 to the PSI pin in this case.

VPSI:

PSI pin reverse voltage

VPSI_C:

PSI pin reverse voltage during communication

The S-8245A/C Series is initialized and the power-saving function is released by deactivating the PSI pin. As a result,

each detection operation is carried out after returning to the normal status.

11. Temperature detection

Serially connect an NTC and a low temperature-dependent resistor (RTH) between the VDD pin and the VREG pin,

and then connect their middle point to the TH pin. It allows for temperature detection at four different points: high

temperature detection during charging, low temperature detection during charging, high temperature detection during

discharging, low temperature detection during discharging.

When the temperature rises, according to the NTC temperature characteristics, the resistance (RNTC) decreases, and

the ratio between RNTC and RTH changes, and then the TH pin voltage (VTH) increases.

When the temperature falls, according to the NTC temperature characteristics, the resistance (RNTC) increases, and

the ratio between RNTC and RTH changes, and then the TH pin voltage (VTH) decreases.

The temperature detection during charging and temperature detection during discharging switch by comparing the VM

pin voltage (VVM) and charge-discharge discriminating voltage (VCHG).

If the relation between RNTC, RTH, and VVM satisfies the itemized condition in Table 15 in each temperature detection,

and each status continues for the temperature detection delay time (tTH) or longer, the CO pin changes to high

impedance, and the DO pin changes to the VSS level. This is the temperature protection status.

If the itemized condition in Table 15 is not satisfied in each temperature detection, and each status continues for tTH or

longer, the temperature protection status is released.

Table 15 Conditions for Each Temperature Detection

Item

TH Pin

VM Pin

CO Pin

DO Pin

High temperature detection during charging

rTHCH  RTH / (RNTC  RTH)

VVM  VCHG

High impedance

VSS level

Low temperature detection during charging

rTHCL  RTH / (RNTC  RTH)

VVM  VCHG

High temperature detection during discharging rTHDH  RTH / (RNTC  RTH)

VVM  VCHG

Low temperature detection during discharging

rTHDL  RTH / (RNTC  RTH)

VVM  VCHG

Remark rTHCH:

High temperature detection ratio during charging

rTHCL:

Low temperature detection ratio during charging

rTHDH:

High temperature detection ratio during discharging

rTHDL:

Low temperature detection ratio during discharging

S-8245C Datasheet(PDF) 20 Page - ABLIC Inc.

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