Siemens TC65 Dokumentacja Pobierz pdf (Strona 46)

TC65 Hardware Interface Description

Confidential / Released

TC65_HD_V02.000 Page 46 of 120 08.06.2006

Software controlled charging:

• Controlled over the CHARGEGATE.

• Temperature conditions: 0°C to 45°C

• Software controlled charging is done when the charger is present (connected to

VCHARGE) and the battery voltage is at least above the undervoltage threshold.

Software controlled charging passes the following stages:

- Power ramp: Depending on the discharge level of the battery (i.e. the measured

battery voltage V

BATT+

) the software adjusts the maximum charge current for charging

the battery. The duration of power ramp charging is very short (less than 30 seconds).

- Fast charging: Battery is charged with constant current (approx. 500mA) until the

battery voltage reaches 4.2V (approx. 80% of the battery capacity).

- Top-up charging: The battery is charged with constant voltage of 4.2V at stepwise

reducing charge current until full battery capacity is reached.

Duration of charging:

• TC65 provides two charging timers: a software controlled timer set to 4 hours and a

hardware controlled timer set to 4.66 hours.

- The duration of software controlled charging depends on the battery capacity and the

level of discharge. Normally, charging stops when the battery is fully charged or, at the

latest, when the software timer expires after 4 hours.

- The hardware timer is provided to prevent runaway charging and to stop charging if the

software is not responding. The hardware timer will start each time the charger is

plugged to the VCHARGE line.

3.5.6 Operating Modes during Charging

Of course, the battery can be charged regardless of the engine's operating mode. When the

GSM module is in Normal mode (SLEEP, IDLE, TALK, GPRS IDLE or GPRS DATA mode),

it remains operational while charging is in progress (provided that sufficient voltage is

applied). The charging process during the Normal mode is referred to as Charge mode.

If the charger is connected to the charger input of the external charging circuit and the

module’s VCHARGE pin while TC65 is in Power-down mode, TC65 goes into Charge-only

mode.

While the charger remains connected it is not possible to switch the module off by using the

AT^SMSO command or the automatic shutdown mechanism. Instead the following applies:

• If the module is in Normal mode and the charger is connected (Charge mode) the

AT^SMSO command causes the module to shut down shortly and then start into the

Charge-only mode.

• In Charge-only mode the AT^SMSO command is not usable.

• In Charge-only mode the module neither switches off when the battery or the module

exceeds the critical limits of overtemperature or undertemperature.

In these cases you can only switch the module off by disconnecting the charger.

To proceed from Charge-only mode to another operating mode you have the following

options, provided that the battery voltage is at least above the undervoltage threshold.

• To switch from Charge-only mode to Normal mode you have two ways:

- Hardware driven: The ignition line (IGT) must be pulled low for at least 2 seconds.

When released, the IGT line goes high and causes the module to enter the Normal

mode.

- AT command driven: Set the command AT^SCFG=MEopMode/Airplane,off (please do

so although the current status of Airplane mode is already “off”). The module will enter

the Normal mode, indicated by the “^SYSSTART” URC.

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