DocID024654 Rev 2

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STNS01

Operation description

Figure 19. CC-CV charging profile (not to scale)

Figure 20. Charging cycle profile

8.3

Battery temperature monitoring

The STNS01 integrates the comparators, biasing circuit and control logic needed to monitor

the battery temperature through an external NTC resistor. This feature is active only during

the battery charging process in order to save power when the system is supplied from the

battery.

When the battery temperature goes outside the normal operating range (0 - 45 °C), the

charging process is put on hold, the alarm signal is activated (the CHG pin toggles) but the

charging timeout timers are kept running.

AM09939v1

t

V

FLOAT

V

PRE

I

FAST

I

PRE

I

END

OFF

PRE

FAST

OFF

CC

CV

FAST

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

0.22

0.24

2

2.2

2.4

2.6

2.8

3

3.2

3.4

3.6

3.8

4

4.2

4.4

8:55

9:38

10:22

11:05

11:48

12:31

Time [h:m]

V

VBATT

IBATT

AM17198v1