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TC65 Hardware Interface Description

Confidential / Released

TC65_HD_V02.000 Page 40 of 120 08.06.2006

Table 7: Temperature dependent behavior

Sending temperature alert (15s after TC65 start-up, otherwise only if URC presentation enabled)

^SCTM_A: 1 Caution: Battery close to overtemperature limit.

^SCTM_B: 1 Caution: Board close to overtemperature limit.

^SCTM_A: -1 Caution: Battery close to undertemperature limit.

^SCTM_B: -1 Caution: Board close to undertemperature limit.

^SCTM_A: 0 Battery back to uncritical temperature range.

^SCTM_B: 0 Board back to uncritical temperature range.

Automatic shutdown (URC appears no matter whether or not presentation was enabled)

^SCTM_A: 2 Alert: Battery equal or beyond overtemperature limit. TC65 switches off.

^SCTM_B: 2 Alert: Board equal or beyond overtemperature limit. TC65 switches off.

^SCTM_A: -2 Alert: Battery equal or below undertemperature limit. TC65 switches off.

^SCTM_B: -2 Alert: Board equal or below undertemperature limit. TC65 switches off.

3.3.4.2 Temperature Control during Emergency call

If the temperature limit is exceeded while an emergency call is in progress the engine

continues to measure the temperature, but deactivates the shutdown functionality. If the

temperature is still out of range when the call ends, the module switches off immediately

(without another alert message).

3.3.4.3 Undervoltage Shutdown if Battery NTC is Present

In applications where the module’s charging technique is used and an NTC is connected to

the BATT_TEMP terminal, the software constantly monitors the applied voltage. If the

measured battery voltage is no more sufficient to set up a call the following URC will be

presented:

^SBC: Undervoltage.

The message will be reported, for example, when you attempt to make a call while the

voltage is close to the shutdown threshold of 3.2V and further power loss is caused during

the transmit burst. In IDLE mode, the shutdown threshold is the sum of the module’s

minimum supply voltage (3.2V) and the value of the maximum voltage drop resulting from

earlier calls. This means that in IDLE mode the actual shutdown threshold may be higher

than 3.2V. Therefore, to properly calculate the actual shutdown threshold application

manufacturers are advised to measure the maximum voltage drops that may occur during

transmit bursts.

To remind you that the battery needs to be charged soon, the URC appears several times

before the module switches off.

This type of URC does not need to be activated by the user. It will be output automatically

when fault conditions occur.

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