A4052
BATTERY MANAGEMENT
AiT Semiconductor Inc.
www.ait-ic.com
1A IS COMPATIBLE WITH THE USB INTERFACE,
LINEAR BATTERY MANAGEMENT CHIP
Enable design
By controlling whether the ISET pin resistor connected, users can reach close A4052 function.
Figure 3. A4052 Enable Design
Open-drain output status indication
A4052 has two open-drain status indication sides, CHAG and DONE, the two status indicator LEDs client can
drive or microcontroller port. CHAG used to indicate charging status, charging time, CHAG is low; DONE to
indicate the charging end of the state, when the charging end, DONE is low. When the battery temperature is
outside the normal temperature range more than 0.15 seconds, CHAG and the DONE pin is high impedance
output state.
When the battery charger not received, the charger will quickly charge the output capacitor to the constant
voltage value, as the battery voltage detection the BAT pin input leakage current, the BAT pin voltage will
slowly down to recharge threshold, so the BAT pin voltage is 150mV to form a ripple waveform, while CHAG
output pulse signal that there is no battery installed. When the battery BAT pin external connectors for the
4.7uF capacitor, the pulse period of about 2Hz.
The following table lists CHAG and DONE pin status in each case：
State
CHAG
DONE
Charge
Always bright
Always off
Full
Without Battery
Flashing
Error
Always off
Always bright
Always off
Always off
Always bright
NOTE1: CHAG flicker frequency with external capacitor when not connect battery, generally recommended
4.7uF.The greater the capacitance, the smaller frequency flicker.
NOTE2: The error situation: Beyond the operating temperature range (temperature too high or too low), Iset
side vacant, VIN <VBAT, VIN <3.8V and so on.
REV1.0
- OCT 2013 RELEASED -
- 8 -
AITSEMI [ AiT Semiconductor ]
