mm1433 Mitsumi Electronics, Corp., mm1433 Datasheet - Page 8

• Manufacturer Part Number: mm1433
• Description: Lithium-ion Battery Charge Control
• Manufacturer: Mitsumi Electronics, Corp.

MITSUMI
Operation
(2) Timer Times
1. Basic Functions
2. Protection Functions
3. Warning Functions
4. Forced Stop Function
5. Charge Restart Functions
Description
1. Charging Operation
· Constant voltage/constant current control.
· Full charge status detection.
· Protection when AC adapter or battery is abnormal.
· Protection from abnormal operation by monitoring battery temperature.
· Protection from abnormal operation by time limitation.
· Constant lighting of green LED to show completion of normal charging
· Constant lighting of red LED to show normal charging operation
· Blinking of red LED showing charging disabled on detection of abnormality.
· Operation check of internal timer for time limitation
· Forced stopping of charging by controlling RESET and CHGSW pins.
· Charge restart when battery voltage drop detection operates after full charge detection
· Charge restart by reconnecting after disconnecting AC adaptor
· Charge restart by reconnecting after removing batteries
· Charge restart by canceling forced stop operation
1.1 Start of Charging
· Charging is disabled at the start of charging in the following cases:
1) Battery is in overvoltage state, i.e., the battery voltage is higher than overcharge detection voltage
2) AC adapter or battery is not correctly connected.
3) RESET pin and CHGSW pin are 0.6 ~ 1.2V.
(Vov). (Charging is prohibited after overvoltage delay time elapses.)
Note: T: OSC oscillation cycle
Overvoltage detection delay time
Overcurrent detection delay time
Full charge detection delay time
Re-charge detection delay time
LED R blinking cycle
Pre-charge timer
1mA charge time
Full charge timer
Item
Calculation formula
T 2
T 2
T 2
T 2
Lithium-Ion Battery Charge Control (1 to 2 cells) MM1433
T 2
T 2
T 2
T 2
19
23
13
10
6
8
8
5
Examples of calculation (for C = 0.01µ, R = 230k)
15min. 28s
4h7min.
56.6ms
14.5s
0.90s
0.45s
0.45s
1.8s