ETAS ES1392.1, User Manual

Page: 13 / 36

Hardware 13
2.3 Controlling the Switches
The switches are controlled using the "control signal switch n " control signals
(see Section 3.3 on page 21).
Tab. 2-3 Control Signal and Switch Position
2.4 Overcurrent Protection with the Status Output
If an overcurrent is detected on one of the battery nodes, the relevant switch
is opened. After a delay of max. 800 ms, the switch is automatically closed
again to check whether the error has been recovered. If the overcurrent can
still be detected, the switch is opened again immediately. This is repeated until
there is no longer an overcurrent.
The user is made aware of one of the switches being switched off because of
an overcurrent by the "signal switch error" status signal at the "CTRL" connec-
tor (see Fig. 3-3 on page 21).
Tab. 2-4 Status Signal for Overcurrent Errors
For more details on protective measures, please refer to Section 2.12
on page 15.
2.5 EEPROM
The type of board (ES1392.1) and the version is stored in an EEPROM and can
be read out via a 1-Wire
®
interface on the "CTRL" connector by the ES1391.1
Power Supply Controller Board.
Control Signal Switch
L/open Open
H Closed
note
The cyclical current impulses which occur with an overcurrent may overstrain the
current limitation of some power supplies. In this case, the battery voltage should
be buffered with a large capacitor at the output of the power supply or a low-
impedance power resistor should be added to the battery voltage line to limit the
current.
Overcurrent Status Signal
Normal operation L
Error H