Datasheet

DocID024654 Rev 2 19/29
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
I
BAT
V
BAT
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
I
BATT
[mA]
V
BATT
[V]
Time [h:m]
V
IN
= 5 V;
V
SYS
No Load; LDO Load = 100 mA; RISET = 1 kΩ
VBATT
IBATT
AM17198v1