User's Manual

AC65/AC75 Hardware Interface Description

Confidential / Preliminary

AC65/AC75_hd_v00.372 Page 37 of 118 2006-08-03

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 AC65/AC75 module, the leakage current ranges between 90µA and 100µA.

• If the AC65/AC75 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.