SM5101 have fever wire short circuit protection function, when the load resistance is less than 0.8 Ω resistance output as,
SM5101 also has a power saving mode, in power saving mode static standby current is less than 1 ua,
SM5101 has perfect battery protection function, has over current, over voltage, constant current, constant voltage, temperature protection function, when the lithium battery voltage is less than 2.7 V for trickle charging, can ensure that no damage to the battery; When lithium battery voltage is greater than 2.7 V, began to large current constant current charging; When voltage close to 4.2 V, the charging current gradually decreases, and charging current is less than a certain threshold, SM5101 stop charging, charging voltage detection error can be plus or minus 1%,
SM5101 touch detection function, its function is the key to replace traditional with variable area, can reduce the peripheral devices,
Power saving mode, the low static standby current (<1 ua)
Output short circuit protection function
Under voltage protection function
Over temperature protection function
Directly from the USB port to the single section lithium ion battery
Precision of +/- 1% of the default charging voltage of 4.2 V
Perfect LED indicator for work
Automatic recharge
Increase the charging port independent, also can light up when charging
A trickle charging 2.7 V
Touch detection function
SOP - 8 encapsulation
Charging function
When the VDD pin voltage rose above the UVLO threshold level or when connected to a battery and charger output terminal, a charging cycle begins, if the BAT pin level is lower than 2.7 V, the charger into a trickle charging mode, in this mode, set SM5101 provides about 1/10 of the charging current, so that the battery voltage to a safe level, to achieve full charging current, when BAT pin voltage rose above 2.7 V, the charger into constant current mode, provide constant charging current to the battery, at this time when the BAT pin voltage reaches finally float charging voltage (4.2 V), SM5101 into constant-voltage charging mode, and charging current began to decrease, when the charging current down to 1/10 of the set value, charging loop ends,
Immediately once the charging cycle is terminated, SM5101 USES a comparator with the 3 ms filtering time to for continuous monitoring of the voltage on the BAT pin, when the battery voltage to 4.05 V (roughly corresponding to the battery capacity of 80% to 90%), the charging cycle start again, this ensures that the battery is maintained at (or close to) a full charge state, and periodically from the needs of the charging cycle start,
Touch function
When is GND SM5101 EN feet and BAT when the voltage is greater than 3.0 V, T feet begin to touch detection function, when there is a touch for the first time, open OUT output; If there are no second touch within 9 s, for the first time touch OUT automatically shut down after 9 s output; If a second touch within 9 s OUT close output, due to the different application and PCB, will affect the sensitivity of SM5101, therefore SM5101 provides external sensitivity adjustment method: can T feet in parallel a small capacitance Cs (1 pf Cs pf 50 or less or less), Cs does not meet the highest sensitivity; Increase the capacity value of Cs can reduce sensitivity,
The LED display
In SM5101 into the charging mode, LED1 before the battery voltage in the normally on state; When the battery is full of LED1 would flash next after 20 (50% duty cycle, 2 hz),
When EN grounding, LED2 is normally on state; Is often OUT of when EN dangling, LED2 state, when the first touch OUT opens, LED1 will gradually bright (about 1 s) first, and then through 8 s normally on state, the last flash twice (50% duty cycle, 2 hz), coming on the current process is as follows: 0 - & gt; Ua - 40 & gt; Ua - 200 & gt; Ua - 800 & gt; 1.5 mA - & gt; 3 ma - & gt; 5 ma - & gt; 9 ma - & gt; 15 ma when EN grounding, touch and battery voltage is lower than 3.05 V, OUT won't open, and then LED1 will flash under 20 (50% duty cycle, 2 hz) destroy or EN dangling after flash directly into dormancy,