Datasheet
Operation description STNS01
20/29 DocID024654 Rev 2
If the temperature goes back into the normal operating range before the maximum charging
time has elapsed, the charging process is resumed from where it left off and the alarm signal
is cleared. If the charging timeout expires while the temperature is still outside the normal
operationg range, the charging process is stopped but can be restarted using the CEN pin.
Both temperature thresholds feature a 3 °C hysteresis.
The battery temperature monitoring block is designed to work with an NTC thermistor
having R
25
= 10 kΩ and ß = 3370 (e.g. Mitsubishi TH05-3H103F).
8.4 Battery overcharge protection
The battery overcharge protection is a safety feature which is active when a valid input
voltage is connected and prevents the battery voltage from increasing over V
OCHG
. When an
overcharge condition is detected, the current path from the input to the battery is blocked
and the fault signal is activated (the CHG pin toggles). When the battery voltage falls again
under V
OCHG
the input voltage (V
IN
) must be disconnected and re-connected to restore
normal operating conditions.
8.5 Battery overdischarge protection
When there is no valid input voltage and the device is running on battery power, the battery
voltage is monitored to avoid overdischarge. If the battery voltage falls below V
ODC
for more
than t
ODD
, the device is turned off and battery drain is reduced to less than 500 nA. This
condition is called the overdischarge state.
When a valid input voltage is connected while in the overdischarge state, the charger and
the LDO are activated. If the input voltage is then disconnected, normal operation is
restored only if the battery voltage has increased above the overdischarge release threshold
(V
ODCR
), otherwise the STNS01 remains in the battery overdischarge state.
Figure 21. Discharging cycle profile
AM17199v1
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
5:52 6:01 6:10 6:18 6:27 6:36
IBATT [mA]
V
BATT [V]
Time [ h:m ]
VBATT
IBATT