UM0527 datasheet(31/66 Pages) STMICROELECTRONICS

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UM0527

General description

31/66

Note:

Long = 2 s, Short = 20 ms

Additionally the state of OUT_REL is stored in EEPROM memory and restored after a cold

start independent of the AUTOSTART setting.

1.2.9

LEDs

LEDs indicates the state of the UPS. The active state is H.

1.2.10

Charger

The battery charger works in two steps: constant current charging and hysteresis constant

voltage. In the constant current step, the battery is charging in current mode until the voltage

of the battery is lower than 28.2 VDC. In the second step, the charger is switched on when

the battery voltage is lower than 26.8 VDC and switched off if the value is higher than 27.8

VDC. The microcontroller controls the process by switching the CHOFF signal.

Off

Short

Off

Long

Rise to H

Table 13.

Working modes (continued)

Working mode

State

Action

Reaction

OUT_REL

BUTTON L time

OUT_REL

ON/OFF

Table 14.

LED states

State

LED green

LED yellow

LED red

Mains mode

Battery mode

Low battery in battery mode

2 Hz 50% duty cycle

Buck/boost mode

2 Hz 50% duty cycle

Battery charging

2 Hz 50% duty cycle

Overload (mains)

2 Hz 50% duty cycle

Overload ( battery)

2 Hz 50% duty cycle

Self test

Fault ( mains)

Fault (battery)

Standby mode

0,5 Hz 50% duty cycle

Table 15.

Battery charge modes

Step of charge

process

Battery

voltage

CHOFF

Description

Current mode charging

< 28,2 V

Charging mode active only after battery working

mode.

>= 28,2 V

Switch to buffered working mode.

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