
TC65 Hardware Interface Description
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TC65_HD_V02.000 Page 37 of 120 08.06.2006
VEXT
See note 1
TXD0/TXD1/RTS0/RTS1/DTR0 (driven by the application)
Interface pins
Undefined
Defined
PWR_IND
CTS0/CTS1/DSR0/DTR0
Figure 8: Signal states during turn-off procedure
Note 1: Depending on capacitance load from host application
3.3.3.2 Leakage Current in Power Down Mode
The leakage current in Power Down mode varies depending on the following conditions:
• If the supply voltage at BATT+ was disconnected and then applied again without starting
up the TC65 module, the leakage current ranges between 90µA and 100µA.
• If the TC65 module is started and afterwards powered down with AT^SMSO, then the
leakage current is only 50µA.
Therefore, in order to minimize the leakage current take care to start up the module at least
once before it is powered down.
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