AN2390 datasheet(20/42 Pages) STMICROELECTRONICS

20 / 42 page

Evaluation board implementation

AN2390

20/42

2.3.3

State diagrams

A slot can be in one of the nine states as described in following table. These states are

updated periodically as described earlier in Section 2.3.1

It is important to understand that this choice of states is only one solution and that there are

many possible ways to manage the behavior of the charger.

The state transition diagram is too complex to be shown in a single figure, it has been

divided into six parts shown in Figure 12 through Figure 17. In the diagrams, 't' stands for

the timekeeper value. The rectangles represent actions performed once during a state

transition.

Table 5.

Slot state definitions

Name

Meaning

Output configuration

Slot outputs

PWM duty cycle

IDLE

Slot empty

Charge disabled,

LEDs off

Unchanged

TRI_1

1st Trickle charge state

Charge enabled,

LED blinking @ 1Hz

Updated periodically to

have Ibat = Itri_1

Constant current charge

Updated periodically to

have Ibat = Iconst

Constant voltage charge,

duty cycle down

Updated periodically to

have Vbat = VF

TRI_2

2nd Trickle charge state

Updated periodically to

have Ibat = Itri_2

SAT

Battery saturated

Charge disabled,

LED ON

Unchanged

EXP

Charge time expired

FAIL

Battery failure

Charge disabled,

LED blinking @ 2Hz

HEAT

Charge suspended

by overheat

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